Identify m∠A and m∠E. The figure shows two right triangles A B C and E D F. Angles B and D are right angles. Angle C is congruent to angle F. A measure of angle A is given by the formula 5 times x degrees. A measure of angle E is given by the formula x plus 20 degrees.

40°, 50°
30°, 60°
45°, 45°
25°, 25°

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?