Solve this system of equations using substitution
y=2x+6
2x-y=2

Factor and solve to find roots x squared -x - 90 =0

How do you find the distance of each number from the mean

Describe how to determine the average rate of change between x = 4 and x = 6 for the function f(x) = 2x^3 + 4. include the average rate of change in your answer.