Could i get some to evaluate -a- (−8)+b where a =2 and b = -7

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10

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.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5