Lucy can buy a pair of shoes from 4 different retailers. Which is the best buy?A. Online Shoes for $32, plus a sales tax of 8% and shipping and handling costs of $6B. From the Best Buy Shoes catalog for $35 plus 8% sales tax and free shipping and handling. C.Local shoe store for $38 with 15% discount and 8% sales taxD. Local shoestore for $40 with 25% discount and 8% sales tax

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?