Can someone please help me?

Sal is tiling his entryway. the floor plan is drawn on a unit grid. each unit length represents 1 foot. tile costs $1.35 per square foot. how much will sal pay to tile his entryway? round your answer to the nearest cent.

Given the graphed function below which of the following orders pairs are found on the inverse function

Collin did the work to see if 10 is a solution to the equation r/4=2.4