What is the solution to the equation 9^-3x = 7? (1 point)

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

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

Collin did the work to see if 10 is a solution to the equation r/4=2.4