- Simplify 4x² – 3xy + 2xy + 9x². Use descending order.​

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia

At 6 1/2 cents per pound of string beans how much does 7 pounds cost

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