SOMEBODY HELP PLZ IM STUCK

Multiply. write your answer in simplest form. 3/8 x 5/7

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

V=x^4-y^4 pick three expressions that can represent the three dimensions of the prism (each in meters)