Please help me explain this for make up test

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?

Describe the end behavior of the function below. f(x)=(2/3)^x-2 a. as x increases, f(x) approaches infinity. b. as x decreases, f(x) approaches 2. c. as x increases, f(x) approaches -2. d. as x decreases, f(x) approaches negative infinity.