A machine that drills holes for wells drilled to a depth of -72 feet in one day (24 hours).
If the machine drilled at a constant rate, what was the
depth after 15 hours?

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

X-10/4 when x = –18 a 7 b –2 c –7 d 2

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?