what is the measure of angle ced?
there are two triangles labeled abc and dce with a common vertex c. in triangle abc, angle bac is labeled as y, and angle abc is labeled as 65 degrees. in triangle dce, angle cde is labeled as 65 degrees
y over 2, because triangle abc is congruent to triangle dce
y, because triangle abc is similar to triangle edc
y + 65 degrees, because triangle abc is similar to triangle dce
115 degrees − y, because triangle abc is congruent to triangle dce

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?