A board of directors consists of 10 people, in how many ways can a chief executive officer, director, a treasurer, and a secretary be selected?

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.

X2 + y 2 = 36 x + y = 6 solve the system of equations.

(x-5)1/2+5=2 what is possible solution of this equation