What is the value of 5(y+3)-3x2 when x=4 and y=2?
A. –23
B. –10
C. 10
D. 23

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?