When a car accident occurs on a dry tar road, police use the function S = square root [30d] to estimate the speed, S, in miles per hour that the car was traveling based on thee distance that the car skidded, d, in feet. Solve this equation for d.

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