Jack collected 360 ship models. 40% of them were made by him. If Jack donated 25% of models he brought, how many fewer models made by himself were donated than those he brought? Please help me

The function below show how much jayna and hannah charge for babysitting. which statement best compares the two plants?

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?

If there are 825 students at cherry hill high school and 4 out of every 5 students voted in the student council election, how many students voted?