IM taking a test and i am having hard time PLZZ HELP ME Karen used one-third of her total stamps on a campaign for charity. Karen used 60 stamps on the charity campaign.

Question 1

Part A

Write an equation you could use to find how many stamps she had at the start. Use the letter s for the variable.

Enter the correct answer in the box

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?