Abby, ben, and carol are having the helier picture taken in how many different ways can they arrange themselves in a line from left to right for the photo?

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?