Alex is rock climbing El Capitan, a rock formation that is 3000 ft above ground level. He climbs 750 feet every hour. Alex's distance from the top of the rock
formation after x hours is represented by the function y + 750x = 3000.

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