Last week, gas cost $2.50/gallon. This week, gas cost $3.20/gallon. What was in the percent change (increase)?

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Sum of the interior angles of a pentagon