Ineed the answer and if i get the answer that would be only answer 7 and 8

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?