Ex 3 -- Ms. Lopez earns a 3% commission on every vacation package she sells. One day she sold a vacation package worth $3,950. How much commission did she earn?

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

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b

Add: (6x^2-5x+3) + (3x^3+7x-8) a. 9x^2+12x-5 b. 9x^2+2x+11 c. 9x^2+2x-5 d. 9x^2-2x+5