Which expression is equivalent to 5y^3/(5y)^-2

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.