Elimination using addition and subtraction. solve for x and y.
-3x+2y=15
-3x+2y=16

How many $20 bills do you need to have to make $280

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3

Aculture started with 2,000 bacteria. after 8 hours, it grew to 2,400 bacteria. predict how many bacteria will be present after 19 hours . round your answer to the nearest whole number. p=ae^kt