My que. stion got dele. ted so here a talk thing i gu. esss

On an airplane there are two seats on the left side and three seats on the right side there are 90 seats o the right side of the plane

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

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?