How many combinations with 3 numbers 0-9?

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

What is the total area of the figure?

How to find the exponential function y=ca^x, with points (1,2) and (2,1)