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This study aims to determine the influence of Net Profit Margin and Debt to Asset Ratio on the stock price of PT Blue Bird Tbk from 2011 to 2023. A quantitative method was used to analyze these variables both partially and simultaneously, as well as to identify which variable has the most significant impact on the stock price. Based on the data analysis, the results indicate that the Debt to Asset Ratio does not have a significant partial effect on the company’s stock price. Simultaneously, this variable also shows no meaningful impact. The contribution of both variables, Net Profit Margin and Debt to Asset Ratio, to the stock price is 27.7%, while the remaining percentage is influenced by other factors not discussed in this study.

Penelitian bertujuan untuk mengetahui pengaruh yang positif dan signifikan model discovery learning terhadap keaktifan belajar  Pendidikan Agama Kristen dan Budi Pekerti peserta didik  kelas VIII di SMP Negeri 1 Siantar Narumonda Tahun Pembelajaran 2024/2025. Hipotesis penelitian yaitu terdapat pengaruh yang positif dan signifikan model discovery learning terhadap keaktifan belajar  Pendidikan Agama Kristen dan Budi Pekerti peserta didik  kelas VIII di SMP Negeri 1 Siantar Narumonda Tahun Pembelajaran 2024/2025. Metode penelitian kuantitatif deskriptif. Populasi seluruh siswa kelas VIII di SMP Negeri 1 Siantar Narumonda Tahun Pembelajaran 2024/2025 yang beragama Kristen Protestan sebanyak 127 orang. Sampel secara acak (random sampling) yaitu 30% dari jumlah populasi yaitu 38 orang. Instrumen penelitian berupa angket tertutup. Hasil analisis data diperoleh: a) Nilai rhitung=0,576>rtabel=0,320 dan thitung=4,228> ttabel=2,02809 menunjukkan adanya hubungan yang positif dan signifikan antara model discovery learning dengan keaktifan belajar  Pendidikan Agama Kristen dan Budi Pekerti peserta didik  kelas VIII di SMP Negeri 1 Siantar Narumonda Tahun Pembelajaran 2024/2025. b) Persamaan regresi . c) Uji determinasi diketahui besarnya pengaruh 33,18%. d) Uji hipotesis diperoleh Fhitung=17,683>Ftabel=3,23 maka H0 ditolak dan Ha diterima. Penelitian menyimpulkan terdapat pengaruh yang positif dan signifikan antara model discovery learning terhadap keaktifan belajar  Pendidikan Agama Kristen dan Budi Pekerti peserta didik  kelas VIII di SMP Negeri 1 Siantar Narumonda Tahun Pembelajaran 2024/2025.

This article discusses the importance of understanding heat convection in fluids in the context of physics and engineering. Using first order Simple Differential Equations (PDS), we can analyze the temperature distribution in a fluid over time and space in high detail. PDS allows modeling heat convection by considering parameters such as temperature differences and fluid flow velocity. Numerical methods are used to complete the PDS computationally, while data collection techniques through literature studies provide an in-depth understanding of relevant theories and previous findings. With the application of PDS and numerical methods, we can better understand and predict heat transfer in fluids, which has wide applications in engineering, biology, and physics. In conclusion, this article provides a comprehensive insight into the use of PDS in the analysis of heat convection in static and dynamic fluids, with a focus on mathematical and computational approaches to better understand this phenomenon.