How do you know the correct order in which to evaluate algebraic expressions?

and that you would use for a .

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Complete the steps, which describe how to find the area of the shaded portion of the circle. find the area of the sector by multiplying the area of the circle by the ratio of the to 360. subtract the area of the triangle from the area of the sector.

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x