Will give brainliest! how many discontinuities are there in this pic? pls ! i think it's three

Which expression is equivalent to -5(3x - 6/7)

Wrote and expression for the difference of p and 4

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