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This research explores how monopoly markets operate in the context of a sharia-based microeconomy, with a primary focus on how prices are regulated based on the principle of adl or justice. Unlike traditional monopolies, which often create inefficiencies in resource allocation and exploit consumers, Islamic teachings require fair prices, in accordance with the Quran's prohibition of gharar (uncertainty) and zulm (oppression). Referring to the theories of Ibn Taymiyyah and modern thinkers such as Chapra, we examine how monopoly companies can achieve maslahah or mutual benefit through profit restrictions, combining prices with zakat, and supervision by a sharia council. Through a simple mathematical model, we prove that monopolies regulated by justice produce better Pareto outcomes than equilibria that only maximize profits, by reducing social losses while still encouraging innovation. Empirical data from Islamic markets in Indonesia, such as halal commodities, support these findings, where regulations can stabilize prices at 15-20% lower. The conclusion of this study highlights the importance of Sharia principles in managing sustainable markets in developing countries, with policy recommendations to reform antitrust rules to align with the maqasid al-Shariah.

The rapid development of technology in today's era requires every profession to align with existing developments. The teaching profession is no exception. Teachers must be able to utilize technology in the learning process to create an engaging learning environment for students. To support this capability, training is essential. This community service activity aims to provide training to teachers at Bancong  Elementary School in Wonoasri District, Madiun Regency, to familiarize themselves with and be able to use the GeoGebra application. This training also aims to improve teachers' competency in utilizing digital technology as a learning medium. The GeoGebra application is an effective application for solving mathematics problems in elementary schools, particularly in geometry, particularly plane figures. The implementation method for this activity includes preparation, training, and mentoring. The training was provided in the form of workshops and hands-on practice using GeoGebra-based mathematics learning media. The activity proceeded orderly and smoothly, and the training participants understood the material well, both theoretically and in practice.

This study aims to analyze and determine the optimal production capacity at Sekar Arum MSMEs to achieve maximum profit using the Linear Programming (LP) graphical approach. The research employed a quantitative method with a descriptive approach. The data used included primary data from interviews and observations, and secondary data from production and raw material records. The analysis was conducted by formulating a mathematical LP model consisting of an objective function and constraint functions based on the limited resources available to the enterprise. Data processing was carried out using POM-QM for Windows version 5 with the graphical method to identify the optimal solution point. The results indicate that the optimal production combination is 2 kilograms of red ginger and 3 kilograms of tamarind turmeric, yielding a maximum profit of Rp4,600,000 per production cycle. The implementation of Linear Programming proved effective in assisting MSME owners in making efficient production decisions, thereby enhancing profitability and the sustainable use of resources.

The problem addressed in this community service project is the low understanding of PKBM Permata Paket B students in applying mathematics to everyday life. The objective of this study is to improve students' understanding of mathematics through context-based learning, as well as to stimulate their interest and independence in solving problems involving numbers. The method used is a contextual teaching approach involving group discussions, problem-solving exercises, and real-life problem applications. The results show that context-based mathematics learning significantly improved students' understanding of budgeting, expenses, and personal finance management. Students also showed increased active participation in learning activities and a better ability to connect mathematical theory with practical problems in their daily lives. This program also had a positive impact on social empowerment, increasing students' independence in managing their daily lives. However, challenges related to understanding more complex concepts remain, and it is recommended to use more varied methods and extend the learning time in the future.

This research was motivated by the lack of teaching materials that align with the characteristics and needs of students. One of the main issues identified is the use of learning modules that are not yet adapted to local culture and fail to provide meaningful learning experiences. To address this problem, the researcher developed a culturally based module inspired by Minangkabau songket. This study employed a Research and Development (R&D) design following the development stages proposed by Sugiyono. The results show that the developed module achieved a validity level of 82.58% (categorized as very valid), a practicality level of 87.6% (very practical), and an effectiveness level of 83.3% (very effective). Based on these findings, it can be concluded that the ethnomathematics-based module on Minangkabau songket for Phase F of the Health Department at SMAN 1 Lareh Sago Halaban in the 2023/2024 academic year meets the criteria of being valid, practical, and effective. Therefore, it is considered suitable for use as a culturally contextual teaching material that integrates local values into the learning process.

This paper seeks to analyze the impact of the Realistic Mathematics Education (RME) approach learning approach on the development of critical thinking and problem-solving skills in third-grade pupils at SDN 104202 Bandar Setia. This research employed a quantitative method with a nonrandomized pretest-posttest control group design, involving two groups: the control group (III A) without treatment and the experimental group (III B) that received the RME learning approach, with a total sample of 50 students. Both groups were administered pre-test and post-test instruments to measure problem-solving and critical thinking skills. The findings revealed that the application of the RME learning approach significantly improved both skills with p < 0.05. These results confirm that RME is effective in enhancing mathematics learning quality through real-life contexts and students’ direct experiences. The implication highlights the importance of integrating RME in elementary mathematics learning as an alternative strategy to foster critical thinking and problem-solving abilities, as well as providing a reference for future instructional innovations.

This study aims to identify and analyze the preparation of financial statements based on the Financial Accounting Standards for Micro, Small, and Medium Entities (SAK EMKM) in the Mebel Kerajinan Jepara business. A descriptive qualitative approach was employed using primary data obtained directly from business owners. Data collection techniques included in-depth interviews, observation of accounting records, and documentation of transaction evidence and records used in preparing financial statements. The data were analyzed descriptively to present systematic, factual, and accurate information about the actual accounting practices in the field. The findings reveal that the preparation of financial statements at Mebel Kerajinan Jepara has not yet fully complied with SAK EMKM. The business only keeps simple records of income and expenses in a notebook without producing complete financial statements such as the statement of financial position, income statement, and notes to the financial statements. The main constraints identified are the limited understanding of the business owners regarding the importance of accounting and the absence of human resources with accounting expertise. These findings highlight the need for assistance, training, and capacity building for business owners in the field of accounting to produce standardized financial reports, enhance business credibility, and support decision-making as well as access to financing. Thus, this study is expected to serve as a reference for local governments, educational institutions, and other related parties in providing accounting guidance to micro and small business actors.

Used cooking oil is a household waste that may pollute the environment and harm human health if disposed of or reused improperly. This community service program aimed to provide a waste management solution while enhancing the community’s economic skills through training on producing aromatherapy candles from used cooking oil. The implementation method included awareness sessions on the hazards of used cooking oil, technical training using a learning by doing approach, and assistance in production and marketing. A total of 30 participants from the Family Welfare Movement (PKK) took part in the program. The results indicated improved knowledge and skills, the production of approximately 50 aromatherapy candles with lavender, rose, and vanilla scents, and the establishment of a community group committed to continuing independent production. The program contributed positively to the environment by reducing around 15 liters of waste oil per month and created new entrepreneurial opportunities for residents. Therefore, this initiative can serve as a sustainable community empowerment model based on circular economy principles.

This research is a development study that aims to create a product in the form of a learning aid, namely audio-visual media through the GeoGebra Classic application, which is used for 3-dimensional geometric shapes lessons in grade V of YPNU Elementary School Medan. This research was conducted because teachers still do not utilize technology optimally in teaching, especially in mathematics subjects related to spatial shapes. The lack of engaging and interactive teaching methods for complex topics like 3D geometric shapes often leads to reduced student interest and understanding. To improve the mathematics learning process on the topic of spatial shapes, audio-visual media was created with the help of the GeoGebra Classic 5 application. The goal is to provide variations in mathematics learning media and increase student interest in the lesson. The development of this media allows students to visualize 3D geometric shapes more clearly and interactively. The instrument used to collect data was a questionnaire that included questions to assess the effectiveness of the media from the perspective of educators and students. The results of the evaluation revealed that learning using this media received 93% responses from teachers and 87% from students, which indicates that the media is very effective. The positive feedback from both groups suggests that this audio-visual tool can enhance students' understanding of spatial geometry concepts and improve the overall learning experience. This study offers an innovative approach to teaching mathematics and highlights the importance of integrating technology into the classroom to foster better engagement and learning outcomes.

This study aims to analyze the influence of derivative skills and literacy in economic mathematics on investment decisions of students in the Management Study Program. The study was conducted using a quantitative approach using primary data collected through questionnaires distributed to students. The collected data were then analyzed using multiple regression tests to determine the extent to which the studied variables influence investment decisions. The results of the multiple regression test indicate that derivative skills and economic mathematics literacy simultaneously have a significant influence on students' investment decisions. The coefficient of determination (R²) value is 0.551, which means that 55.1% of the variability in investment decisions can be explained by these two independent variables, while the remaining 44.9% is explained by other factors not examined in this study. This figure indicates that students' ability to understand and use economic mathematics concepts, especially in terms of derivatives, as well as their financial literacy, play an important role in forming rational and informed investment decisions. The results of this study indicate that mastery of economic mathematics concepts, especially derivative skills, has a direct impact on students' ability to make better and more logical investment decisions. On the other hand, financial literacy also influences how students assess and manage investments, resulting in wiser decisions. Therefore, it is important for educational institutions to integrate mathematical economics and financial literacy into their curricula to help students make more rational investment decisions and reduce potential future financial risks. Furthermore, this study also suggests the need to improve students' understanding of basic concepts in mathematical economics and financial literacy. Management study programs can strengthen their curricula by providing more in-depth training in the applications of mathematical economics, such as the use of derivatives in investment analysis.

This thesis discusses efforts to increase students’ interest in learning Mathematics through the use of concrete media among third-grade students at SDN 110/1 Tenam. The purpose of the study is to improve students’ interest in learning Mathematics by using concrete media with these third-grade students. The results of the study show an increase in learning activities that indicate student interest during Cycle I and Cycle II. In Cycle I, all student learning activities were still at percentages below 70%, with ratings categorized as poor and adequate. Meanwhile, in Cycle II, the increase in student learning activities was shown by all activities reaching percentages above 74%, which means they exceeded the predetermined Learning Objectives Achievement Criteria (KKTP) and were rated good and very good. In addition, improved learning outcomes, as evidence of increased student interest, also showed a significant rise. In Cycle I, students’ learning outcomes did not meet the Learning Objectives Achievement Criteria (KKTP), with a class average of 68.9%, whereas in Cycle II, overall class mastery reached 82.3%. This improvement in learning outcomes indicates that students showed fairly good interest when learning with concrete media.

Advances in technology and computers are utilized in various fields of contemporary applications, especially in cryptography and data security in graph theory applications. By understanding the concepts of graph theory, researchers and developers can design cryptographic algorithms that are stronger, more efficient and resistant to attacks. One of the cryptographic applications that has been implemented is the XNOR algorithm. This algorithm has been applied to encryption and decryption as well as the use of stream ciphers. By using 64 bits, the XNOR algorithm can expand encryption and decryption capabilities and increase the security of encrypted data. In this research, an analysis was carried out regarding information encryption and decryption algorithms with the application and development of the XNOR gate logic circuit method in Boolean algebra and graph theory. This research uses the example of the word MATH, which can be changed into a code or password and vice versa to secure information that you want to keep secret. Apart from that, an analysis of the graph formation of each character in the word MATH was also carried out using Python which produced semi-Euler and Hamilton graphs  

Aromatherapy candles made from used cooking oil represent an eco-friendly and economically valuable entrepreneurial innovation. This proposal presents the utilization of used frying oil as a base material in producing aromatherapy candles, aiming to support the circular economy concept and provide an alternative solution to environmental pollution. The product formulation combines paraffin, beeswax, and natural essential oils, offering relaxation and comfort while also opening up new business opportunities. SWOT analysis and marketing strategies based on the 4Ps (Product, Price, Place, Promotion) serve as the foundation for business development. The results of the study show that aromatherapy candle businesses have strong potential to attract consumer interest, especially among young people, and can deliver significant social, economic, and environmental impact.

A parabola is a curve that consists of points that are equidistant from a fixed point (focus) and a fixed line (directrix). This study aims to analyze the shape of the canopy roof of the UBB Medical Building using an analytical geometry approach on parabolas. The method used is a quantitative descriptive based on visual documentary online and proportional estimates against comparative objects. The parabola model is constructed from three key points and visualized using GeoGebra. The results show that the shape of the canopy can be accurately represented through the equation of a parabola, with a symmetrical and aesthetic structure. This research proves that mathematical concepts can be practically applied in architectural design.

The This study uses a descriptive statistical approach to analyze the level of student satisfaction with campus facilities at the State Islamic University of North Sumatra. Data were obtained through an online questionnaire using a simple random sampling method with 36 respondents. The questionnaire covered four categories of facilities: general, technology and accessibility, academic support, and campus and infrastructure. The analysis involved calculating percentage, probability, mathematical expectation, variance, and standard deviation. The results showed that library comfort had the highest satisfaction score (expected = 4.06), while the Wi-Fi connection had the lowest score (expected = 3.06, deviation = 1.39), indicating dissatisfaction and an uneven perception. Other aspects, such as academic guidance by lecturers (expectation = 3.86), toilet facilities (expectation = 3.83), and laboratories (expectation = 3.72), showed good satisfaction levels. These findings provide a strong basis for the campus to improve low-scoring areas and maintain areas that meet student expectations.

PTK was conducted at SMAN 2 Pasuruan with one class as the subject of the research. The purpose of the CAR is to increase students' motivation to learn by using Quizziz learning media. The research was conducted in two cycles, with planning, implementation, observation, and reflection as part of it. The results of the study indicate that the use of Quizziz can increase students' desire to learn. Based on the results of the PTK conducted in class X of SMAN 2 Pasuruan on increasing students' learning motivation by using Quizziz learning media in mathematics learning. In cycle 1, the percentage of students' learning motivation was 74%. Furthermore, in the second cycle, the percentage of students' learning motivation was 83%. With this statement, students' learning motivation increased by 9%. With each quiz given, students become more active and compete healthily. The results show that Quizziz can be used as a useful learning tool to encourage students to learn more. This study found that Quizziz can increase students' motivation and have a positive effect on their learning outcomes.

Econometrics is a discipline in economics that combines economic theory, mathematics, and statistics to quantitatively assess economic phenomena. This paper aims to introduce econometrics as an important tool in economic analysis and explain its applications in various sectors such as macroeconomics, microeconomics, development, and finance. Using a descriptive qualitative research method based on literature review, this paper explains how econometrics is used to test economic conjectures, make predictions, and support data-driven decisions. In addition, this article also discusses the advantages of econometrics, the challenges that arise in its application, and the software used in econometric analysis, including Excel, SPSS, and EViews. The findings show that econometrics is useful not only for academics but also for decision makers and business actors in designing more efficient economic strategies and policies. However, several problems such as data limitations, model assumptions, and specification errors are still challenges that need to be overcome by increasing capabilities and utilizing technology. It is hoped that this paper can broaden understanding and encourage more effective and appropriate use of econometrics in Indonesia.

This study aims to analyze the perspectives of mathematics students on mixing aloe vera extract with weak acid solution for hair health and softness. The research method used is descriptive quantitative through the distribution of questionnaires to 43 mathematics students at Medan State University and other universities in North Sumatra. The questionnaire consists of 19 statements covering aspects of knowledge (12 items), environmental awareness (4 items), and psychomotor (4 items) with a Likert scale of 1-5. The results showed that the majority of respondents had good knowledge about the benefits of aloe vera for hair care (mean = 4.02), but the understanding of weak acid solution and its mechanism of action was still moderate (mean = 3.12). The environmental awareness aspect showed a high value (mean = 3.76) which reflects the tendency of students to choose natural products. Meanwhile, the psychomotor aspect showed a moderate value (mean = 3.44), which indicates the limitations of respondents' skills in applying hair care products optimally. This study found a positive correlation between knowledge about natural ingredients and the tendency to use natural-based products for hair care. The results of this study are expected to be the basis for developing hair care product formulations based on natural ingredients that suit the needs and preferences of students.

This study aims to optimize sales profit at the MSME Batagor Bandung Tarakan by applying the Simplex method in linear programming, supported by the POM-QM for Windows software. Profit optimization plays a crucial role in strategic decision-making, particularly in determining the optimal daily production quantities to enhance operational efficiency, maximize the use of raw materials, and meet market demand effectively. The Simplex method was chosen for its ability to solve linear optimization problems involving multiple constraints and variables, providing accurate mathematical solutions to achieve maximum profit. This research utilizes daily production data as the basis for analysis, which is then processed using the Simplex method in POM-QM. The results show that implementing the Simplex method can increase daily profits from IDR 634,000 to IDR 831,408 through a more efficient production combination. The study concludes that the Simplex method, when applied via the POM-QM software, is an effective tool for daily production decision-making and can support MSMEs like Batagor Bandung Tarakan in improving their competitiveness and business sustainability.

This project involves the development of audiovisual learning media using the Geogebra Classic program, which specifically focuses on building materials for Class V at SDN 105380. This study is based on the inadequate use of technology by educators, especially in the application of learning media for teaching mathematics. To improve the teaching of mathematics using building materials, audiovisual learning media using the Geogebra Classic 5 program was created to diversify math learning resources and increase student engagement in math classes. This study uses ADDIE paradigm. This Model represents analysis, design, development, implementation, and evaluation. This study involved a cohort of 32 students from Class V SDN 105380. This research instrument uses questionnaires that include validation questionnaires for two experts, instructor effectiveness questionnaires, and student effectiveness questionnaires. The findings of this study indicate the creation of appropriate resources for the learning process, achieving an average value of 80% in the very feasible category according to the material validator, and a value of 88% in the very feasible category according to the media validator. The efficacy of Learning media resulted in scores of 93% for teacher responses and 87% for student responses, indicating that the criteria for Learning media are very successful. Based on these results, it can be concluded that the audio-visual learning media assisted by the geogebra application has been declared very feasible and effective.