What value of x makes this equation true? 7x+15=2(3x+8)+x

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?

If twice a number is at least three less than four times the number, which of the following are true? let n represent the number.

What is the positive solution to the equation 0 = -x2 + 2x + 12quadratic formula: x = -b/b²-4ac0-2+5202-20 ite10-1+2