3.cornelia spends 2 2/3 hours studying for her big science test. she spent 2/3 of an hour finishing her writing assignment and 1/4 of an hour playing outside. how much time did she spend overall on the three activities?

Could someone me with this question i’ve been stuck on it for 20 minutes

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?

At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.