What is the value of 36x-8y2 when x=3 and y=-6

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?