Functions in Tables, Graphs, and Equations

1. The function f(x) = 2x + 5 represents the grade a student achieves on a test f(x) based on the number of hours they study (x). Explain in words what this function means in terms of the student's grade and study time.

2. A student finds that studying with a group helps them understand the material better. The function g(x) = (x - 3) / 4 represents the average amount of time spent on each problem, where x is the total study time in minutes. Describe in words how the total study time (x) relates to the average time spent on each problem, according to the function g(x).

3. If h(x) = 5x - 8, find the value of h(4). Show your work.