Which shows the correct substitution of the values a, b, and c from the equation -2 = -x + x2 – 4 into the quadratic formula?
Quadratic formula: x =
-b ty
b/b2 - 4ac
29
O x==(-1
-(-1)/(-1)2 - 4(1)(-4)
2(1)
O
x==1=V7-44-18-4
O
x =
- 11/(1)2 - 4(-1)(-2)
2(-1)
Ox=-(-1) IV(- 112 - 4(1)(– 2)
2(1)

What is the area of triangle abc if a = 8, b = 11, and c = 15?

52 cm radius = diameter = area = circumference = circumfer

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?