B=3 v/h solve for v, middle school math

What are the soultion(s) to the quadratic equation 40- x^2=0

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

21 type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. the solution set of n2 - 14n = -45 is { (separate the solutions with a comma)