Explain why 30 ÷ = 6 is the same as 30 − − − − − − = 0. What is the value of in this example?

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)