The sum of twice a number and four times another number is 4. The difference of the two numbers is 5. Find the numbers.

Could someone with number 1 and 2

Find the commission on a $590.00 sale if the commission is 15%.

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