He formula for the surface area of a sphere is a = 4πr2. which equation correctly solves the equation for r? a) r = 4πa b) r = a 4π c) r = a 4π d) r = a 4π

If f(x)=2x+2and g(x)=x^3, what is (g•f)(2)

Which of the following lines does not intersect the line y=-2x+3 ? a) y=2x b) y=2x-3 c) y=2x+3 d) y=-2x-3

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.