Daria tries to work about the same number of hours each week. She
estimates that she will work about 170 hours over the next four
weeks.
• Write an inequality to model the domain of the function
represented by the graph.
• Estimate the amount of money Daria will earn over the next four
weeks.
• Explain how you determined your estimate.
Enter your inequality, estimate, and explanation in the box provided.

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?