Casey has a job doing valet parking. casey makes an hourly rate of $4.55 per hour plus tips. last week casey worked 26 hours and made $898.55. how much in tips did casey earn last week?
a. $34.56
b. $118.30
c. $157.25
d. $780.25

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