Iam a figure with faces that are polygons

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Aubrey read 29 books and eli read 52 books what number is equal to the number of books aubrey read?