In winter, the price of apples suddenly went up by  .75  per pound. sam bought  3  pounds of apples at the new price for a total of  $5.88write an equation to solve for p

Don't know how to find x given these segment lengths

Icould really use some with this question.

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