1) What is the scale of a drawing in which a 9ft wall is 6 cm long?

2) Using a ¼ in. = 1 ft. scale, how long would a drawing of a 22 ft car be?

3) The height of a person on a scale drawing is 4.5 in. The scale is 1:6. What is the actual height of the person?

The scale of a map is 1 in. = 21 mi. Find each length of the map.

4) 147 mi = 5) 5.25 mi. =

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?