What is the answer to thus problem z=y-x

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

Over the course of a month, a person's weight decreases. what type of relationship is this? a. positive relationship

The product of sin 30 degrees and sin 60 degrees is same as the product of