Select the correct answer.
Which relation is also a function?


The area of a rectangle is 15+5y square feet. which of the following expressions could be the length of the sides of the rectangle, in feet a. 5 and 3y b. 5 and 3+y c. 5 and 5+y d. 3 and 5+3y

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers