On a coordinated plane rs is translated 4 units up and 4 units to the right to create r's'. line r is drawn through r and r', and line s is drawn through s and s'. which statement about lines r and s is true?
a. lines r and s are parallel
b. lines r and s are perpendicular
c. lines r and s have the same x-intercept
d. lines r and s have the same y-intercept

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?