Which equation shows the quadratic formula used correctly to solve 7x2 = 9+ x for x? -13V012-4709 O X= 2(7) 11 V-1)2-47(9) OX= 207) 2 -1+1/(-1)' +4(7)(9) -1( 2(7) O X= 1+ (-1)+4(79 2(7) O X=

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

Lana's family entered a 5-kilometer race lana's average step length is about 0.5 meter how many steps will she need to take the finish

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?