Ms. murphy has to select 4 swimmers out of 9 swimmers to create a relay team. in how many ways can she create a relay team? 3,024 6,561 15,120 362,856

The sum of two numbers is 86, and their difference is 20. find the two numbers

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Tomas used 3 1/3 cups of flour and now has 1 2/3cups left. which equation can he use to find f, the number of cups of flour he had to begin with? f+3 1/3=1 2/3 f-3 1/3=1 2/3 3 1/3f=1 2/3 f/3 1/3=1 2/3