Evaluate each algebraic expression for the given value. 34 - y for y = 5 m3 + 18 for m = 2 +42 for d = 70 5​

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

Ineed in figuring out this problem.

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