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Lesson 7: Practice Problems
10
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1. A car travels 55 miles per hour for 2 hours, Complete the table,
time (hours)
distance (miles)
miles per hour
1
55
55
/
1
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110
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How to simply and write the answer n a whole number

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?

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?