Find two integers that meet the given conditions. The first integer is the opposite of -4. The second integer is less than the first integer. The distance between the two integers is 9. Name the two integers.

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