Final Answer:
Ryan needs to get a grade of A (4) in Social Studies to reach a GPA of 3.75.
Step-by-step explanation:
To calculate the GPA, we use the formula:
![\[ GPA = \frac{(\text{Grade in Subject A} * \text{Credit Hours A}) + (\text{Grade in Subject B} * \text{Credit Hours B}) + \ldots}{\text{Total Credit Hours}} \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/4bjvs7i5h1jjej79oh41zv3f232o5xcjro.png)
Assuming Ryan's current GPA is 3.75, and the grades for other subjects (B, C, D, F) are known, we can set up the equation as follows, considering each subject's credit hours (which are not provided but assumed to be the same for simplicity):
![\[ 3.75 = \frac{(4 * \text{Credit Hours for A}) + (3 * \text{Credit Hours for B}) + (2 * \text{Credit Hours for C}) + (1 * \text{Credit Hours for D})}{\text{Total Credit Hours}} \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/l527q3r89h3turv0wfz50yarfocdf0fui7.png)
Since we know the values for B, C, and D, we can substitute them into the equation:
![\[ 3.75 = \frac{(4 * \text{Credit Hours for A}) + (3 * \text{Credit Hours}) + (2 * \text{Credit Hours}) + (1 * \text{Credit Hours})}{\text{Total Credit Hours}} \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/2ig5zimil7ihdspj9gbmianoox0vvopn4p.png)
Solving for the total credit hours gives:
![\[ \text{Total Credit Hours} = \frac{(4 * \text{Credit Hours for A}) + (3 * \text{Credit Hours}) + (2 * \text{Credit Hours}) + (1 * \text{Credit Hours})}{3.75} \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/alqbi6bluy1r1hf5c48nddr1o4kaesy7a4.png)
Assuming the total credit hours are a reasonable positive value, we can now determine the grade Ryan needs in Social Studies (subject A). To maintain a GPA of 3.75, the contribution from Social Studies must be:
![\[ 4 * \text{Credit Hours for A} = 3.75 * \text{Total Credit Hours} - (3 * \text{Credit Hours}) - (2 * \text{Credit Hours}) - (1 * \text{Credit Hours}) \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/xoxwldgkj461zave7fhjafhexve03byjw8.png)
After calculating, we find that Ryan needs a grade of A (4) in Social Studies to achieve a GPA of 3.75.