The 3rd term of a GP is 20 and the 8th term is 640 find the common ratio and the 10th term of the GP ?​

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1