7 Sheila buys flower bulbs from a catalog for $2 each plus a $4 shipping charge for the whole order. She spends $20 on flower
bulbs. The model can be used to determine x, the number
of bulbs Sheila can order. Write the equation to determine the
number of bulbs Sheila can order.

How many bulbs can Sheila order?

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?