A flower bed in the corner of your yard is in the shape of a right triangle. The perpendicular sides of the bed measure 7 feet and 9 feet. Calculate the area of the flower bed.
a. 39.5 sq. ft
C. 21.5 sq. ft
b. 31.5 sq. ft
d. 11.5 sq. ft

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?