A blow-up pool in your backyard has a diameter of 8 feet. what is the circumference of the pool? round to the nearest 10ths

Multiplying an even number of negative numbers gives an answer that is choose from:

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest