A) The diagram shows a parallelogram ABCD. The length of its sides are AB= (3x + y)cm, BC= (2x - 1)cm, CD= (3y + 11)cm and DA= (x + y)cm.
Find the values of x and y.
b) Given the height AE of the parallelogram is 8cm, find its area, in square cm

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?