Wilhelmina has 8.3 ounces of peanut butter. If she makes 5 sandwiches with an equal amount of peanut butter on each how much peanut butter does she put on each one? Irene buys a talking doll for $10.56 and some batteries for $422. She pays with a $20 bill. Estimate how much change she should get to the nearest dime. Assessment Practice

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?