If angle a=(6x+13) and angle b=(3x-4) and they are complimentary angles, what is the measure of a

Use the x-intercept method to find all real solutions of the equation. x^3-10x^2+27x-18=0

Which graph corresponds to the function f(x) = x2 + 4x – 1?

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y