Simplify: 5w5 - (-4w5

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

Which graph represents the given linear function 4x+2y=3

An ant travels at a constant rate of 30cm every 2 minutes.at what speed does the ant travel per minute