Astudent answers 80% of the questions on a math exam correctly. if she
answers 48 questions correctly, how many questions are on the exam?

Step-by-step explanation:

Set up an equation. 80 percent equals 0.8

0.8x=48

since 80 percent of x, the amount of questions on the exam equals to 48 questions correct.

Divide both sides by 0.8 to get 60

1 2/5 - (-3/5)

First, we're going to convert 1 2/5 into an improper fraction.

1 2/5 = 7/5

7/5 - (-3/5)

Subtracting a negative is the same as adding, so the problem will look like:

7/5 + 3/5

The denominators are the same, so we just add the numerators.

The answer is 10/5, or 2.