Find the vertex form of the function then find the following a) intercepts b) vertex c) maximum or minimum d) range s(x)=-5x^2-30x-40

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