Question 8/Multiple Choice Worth 1 points) (01.06 LC) 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. c=(a+b)/(2) b=(2C)/(a) b=2c+a b=2C-a b=2C(a)

## Step 1
The problem provides us with the equation $c=\frac{a+b}{2}$, which represents the average of two test scores, $a$ and $b$, being equal to the course grade, $c$.

## Step 2
To isolate $b$, we need to perform the following steps:
1. Multiply both sides of the equation by 2 to get rid of the denominator on the right side. This gives us $2c=a+b$.
2. Subtract $a$ from both sides to isolate $b$. This gives us $b=2c-a$.