Josephine is taking a college course, and her professor bases the course grade on the average of 2 tests taken in the semester.
She wants to know what she needs to earn on the last test to maintain her grade. Rearrange the following equation for b, where A is the average of 2 test scores, a and b. A equals the quantity a plus b all over two
b equals two times A over a
b = 2A + a
b = 2A − a
b = 2A(a)