How many ways can 3 pairs of shoes be picked out from 8 pairs of shoes

Abook store is having a 30 perscent off sale. diary of the wimpy kid books are now 6.30 dollars each what was the original price of the books

Henry's butcher shop uses an electronic scale that measures to 1/100 of a pound. which is the most accurate measurement based on the limitations of the scale that might be found on a package of meat sold by henry?

What is the squate root of r^64 needa r^4 b r^8 c r^16 d r^32