Which one of the statements about geometric mean is true? A. There are infinitely many pairs of whole numbers that have a geometric mean of 4. Oo B. There are infinitely many pairs of real numbers that have a geometric mean of 4. O C. There are finitely many pairs of real numbers that have a geometric mean of 4. O D. Any pairs of numbers that have a geometric mean of 4 must be whole numbers. Also this wasn't taught to us

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?