If z + 4 = 3z and 3 - y = -7, what is the value of xy
1. 20
2. -40
3. 40
4. -20

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.

What point is the projection of q on a) r b) s c) t

Simplify (2^5/3^2)^4 a. 2^20/3^8 b. 2^9/3^8 c. 8^5/12^2 d. 2/3^2