Two different-sized wheelbarrows and shovels are being used to move dirt.
Wheelbarrow A weighs 20 pounds empty
with each shovel of dirt adding 5 pounds to
its total weight. Wheelbarrow B weighs 32
pounds empty with each shovel of dirt
adding 4.25 pounds to its total weight. How
many shovels of dirt will make the total
weight of the two wheelbarrows equal?

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?