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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.

Low financial literacy is caused by several factors. Research related to financial literacy in the Management Study Program of the Islamic University of North Sumatra is still rarely conducted so it is necessary to discuss and analyze what factors can influence financial literacy in the study program. This study uses a descriptive research method with the research approach used by the author is quantitative research. This approach uses a quantitative approach because it uses numbers, starting from data collection, data interpretation, and presentation of results. Based on the significance value (Sig.) in the F test, it can be concluded that the hypothesis is accepted. This means that Age (X1), and Parental Education Level (X2) simultaneously (together) have a significant effect on the Financial Literacy variable (Y). Based on the magnitude of the determination coefficient (R Square) of 0.902 or equal to 90.2%. This figure means that the variables Age (X1), and Parental Education Level (X2) simultaneously (together) influence the Financial Literacy variable (Y) by 90.2%. Management study program students are expected to be able to better understand Financial Literacy because this will be knowledge in the future and is also very important for the role of parents. The Adjusted R Square level reached 89.9% and the remaining 10.1% was influenced by other variables outside this regression equation or variables that were not studied or significant

This research is motivated because self-confidence in using skincare products recommended by celebrity endorsers is also an important factor in purchasing decisions. The purpose of this study was to analyze the influence of celebrity endorser Tasya Farasya and Instagram social commerce on the purchase decision of the Originote skincare moisturizer on female students of the FPP UNP Makeup and Beauty Education Study Program. This type of research is Ex post Facto with a quantitative research method approach. The population of this study were female students of the 2020, 2021, 2022 and 2023 Makeup and Beauty Education Study Program, namely 365 people. The type of sampling used in this study was non-probability with a purposive sampling technique with a total of 78 people. Data were collected through observation methods and research questionnaires. The preparation of the instrument was carried out by sorting the Likert scale. Data were analyzed by descriptive analysis, normality tests and hypothesis tests. The results of the study obtained 1) Instagram social commerce partially has a significant effect on Moisturizer Purchase Interest in Female Students of the FPP UNP Makeup and Beauty Study Program. 2) Celebrity endorser Tasya Farasya partially has a significant effect on the Moisturizer Purchase Interest of Female Students of the Makeup and Beauty Study Program, FPP UNP. 3) Celebrity Endorser Tasya Farasya and Social Commerce Instagram simultaneously influence the purchase decision of the Originote skincare moisturizer for female students of the Makeup and Beauty Education Study Program, FPP UNP. Suggestions to increase insight into the material in the lesson for students, in increasing knowledge and information about the influence of celebrity endorser Tasya Farasya Instagram social media on the purchase decision of the Originote skincare moisturizer for female students of the Makeup and Beauty Education Study Program, FPP UNP.