14. a company rents bicycles for a fee of $10 plus
$4 per hour of use. write an algebraic expression
for the total cost in dollars for renting a bicycle
for h hours.

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