Which is a quadratic function having a leading coefficient of 3 and a constant term of -12?
Rx) =-12x2 + 3x + 1
f(x) = 3x2 + 11x - 12
flx) = 12x2 + 3x + 3
(x) = 3x - 12

If a || b and e || f , what if the value of y ?

With alll of except for the 2 that i did already

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?