ana starts working at 2:40 pm and finishes work at 5:30 pm. how much time does ana spend working? use the number line to solve the problem

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

Plzzz answer both questions and i will give you 100 points