I need help!! Given a quadratic function, which choice explains the meaning of the zeros graphically?

a) f(x)= (x+p) (x+q) where p and a correspond to the x-intercepts

b) f(x)= (x-p) (x-q) where p and a correspond to the x-intercepts

c) f(x)= (x-p) (x-q) where p and a correspond to the vertex

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?