What is the final price with discount off 25% off $30

Which of the following describes the symmetry of the graph of y = x3?

Can someone explain to me how to do

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