Solve each system using the substitution method 6x-y=-4 and 2x+2y=15

You are remodeling your kitchen. you’ve contacted two tiling companies who gladly told you how long it took their workers to tile of a similar size jim completed half the floor in 8 hours. pete completed half of the other floor in 7 hours. if pete can lay 20 more tiles per hour than jim, at what rate can jim lay tiles

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)