Determine whether the parabola opens upward or downward. y= - x2 – 5x + 8
In which direction does the parabola open?
downward
upward

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

Using elimination, what is -4x+2y=-12 4x+8y=-24

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?