Juan is hiking up a mountain starting at an elevation of 800 800 feet. every hour, he is 2000 2000 feet higher in elevation. which function, h(t), where t time in hours, represents juan's height over time. h(t)=2000t h(t)800t+2000 h(t)=2800t h(t)2000t+800

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?