An astronaut drops a rock into a crater on the moon, The distance, d(t), in meters, the rock travels after t seconds can be modeled by the function d(t) = 0.8t7. What is the average speed, in meters
per second, of the rock between 5 and 10 seconds after it was dropped?

If 25% of y is 30, what is 60% of y?

Marking brainliest rewrite the equation x = 65 - 60p by factoring the side that contains the variable p.

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?