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)