Yolanda's sunflower plant was 64.34 cm tall in july. during august, the plant grew 18.2 cm.

part a:
estimate the height of yolanda's plant at the end of august by rounding each value to the nearest whole number. will your estimate be less than or greater than the actual height? explain your reasoning.

part b:
was the exact height of the plant at the end of august? was the estimate less than or greater than the exact value?

plz

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?