How do you calculate an object’s mechanical energy?

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

Find the rate at which the water is now flowing from the tap give your answer cubic centimetres per second

How much is $1200 worth at the end of1 year,if the interest rate is 5.5% is compounded quarterly.