Please only answer the last one.

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

The graph below shows the line of best fit for data collected on the number of cell phones in cell phone cases sold at the local electronic store on four different days