Pls, what is surface area?​

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

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

I’m confused on how to work the pie charts