Which phrase describes the algebraic expression x- 21.5 a) 21.5 decreased by x b) x more than 21.5 c) 21.5 minus x d) x less than 21.5

What are the domain and range of f(x)=[1/5]x

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.