The graph of function g is the graph of function f (x) = 2x^2 + 5 after a vertical stretch by a factor of 3. What is the function rule for function g? A. g(x) = 6x^2 + 15

B. g(x) = 2x^2 + 15

C. g(x) = 6x^2 + 5

D. g(x) = 2x^2 + 8​

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?