Which values of a and b make the polynomial axbx+ a perfect square trinomial? a = 4 and b = 12 a 16 and 1-24 Da 9 and b-18 D-25 and 6-15 Da 1 and 3

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

Which expression is rational? 6. , square root two, square root 14, square root 49

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?