Question

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 c is the average of 2 test scores, a and b. (1 point)

Answer 1

Averaging formula:

A=sum of n values / n

Substitute the variables,

c is the average,

a and b are the test scores

∴

$c=\frac{a+b}{2}$

rearrange for b

$2c=a+b$

$2c-a=b$