Two solid wooden spheres have radii a cm and 3a cm respectively. If the smaller one has a volume of 250 cm3, find the volume of the larger one?

For the function, f(x) = -5x 2, find f(-4).

Factor the monomial completely 42a3b3

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