Can somebody me with this question on which operation i should use? multiplication, division, subtraction, addition, etc.

Which graph represents the parent function of y=(x+2)(x-2)

Janet is rolling a number cube with the numbers one through six she record the numbers after each row if she rolls of keep 48 times how many times should she expect to roll a 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