How do i find miles per hour when i get minutes and miles

Your friend swims on the school team. in his first four races, his times are 24.7, 23.5, 25.6, and 27.2 seconds. which time listed for his next race would make the range larger?

17 in long 1.3 ft wide and 8in high what is the volume

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.