Set up the following addition using a vertical format and find the sum of the given polynomials. 2mn + 4n2 and 5m2 - 7mn

5 m2 + 5 mn - 4 n2
5 m2 - 14 mn - 4 n2
9 m2 + 9 mn - 4 n2
5 m2 - 5 mn + 4 n2

Is the orthocenter of a triangle on the inside ?

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

Solve: 3x+y=6 4x-2y=18 show all work !