Ahippopotamus can run at the speed of about 24.9 miles per hour. at this rate, how far can the hippo run in 30 minutes? use the following proportion: 24.9 mph1 hour = x30 min

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.

Which one is the correct answer, and why?