Which statement best describes f (x) = negative 2 StartRoot x minus 7 EndRoot + 1?

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319

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?