Write an equation in slope intercept form y=3(x-4) + 6x

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

Average acceleration: i have no idea how to do this.

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.