F(q)=2q+3... This is the equation in a function notation with q as the independent variable
F(x) = x + 5
x = f(x) - 5
Range = {7, 9}, then range = {7 - 5, 9 - 5} = {2, 4}
Answer: D
Step-by-step explanation: You just have to substitute the numbers for the variable in each equation till you get the right one. Sorry, but I don't remember the formula for it.