Which expression can be used to find the surface area of the following cube?
Cube
Choose 1
Choose 1

(Choice A)
A
36+36+36+3636+36+36+3636, plus, 36, plus, 36, plus, 36

(Choice B)
B
12+12+12+12+12+1212+12+12+12+12+121 2, plus, 12, plus, 12, plus, 12, plus, 12, plus, 12

(Choice C, Incorrect)
INCORRECT
6+6+6+6+6+66+6+6+6+6+66, plus, 6, plus, 6, plus, 6, plus, 6, plus, 6

(Choice D)
D
36+36+36+36+36+3636+36+36+36+36+36

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?