How many solutions does this equation have? 3 u + 4 u = 7 u

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

Add the fractions and simplify 1/2+ 1/3

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10