Which expression is equivalent to the given expression? (-5y + 21) (y-5)

And employees salary increase by $4500 which represents a 15% raise what is the employees new salary

Carley bought a jacket that was discounted 10% off the original price. the expression below represents the discounted price in dollars, based on x, the original price of the jacket.

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