Which of the following statements are equivalent to the statement "price increased by 100%"? choose all correct answers. (a) the price doubled (b) the price is 150% of the price before (c) the price was reduced by a quarter (d) the price became a half of what it was before (e) the price is now 1.5 of what it was before (f) the price now is 66 2/3 % of what it was before (g) the price now is 200% of what it was before (h) the price is 75% of what it was before

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?