Work out the circumference of this circle. Give your answer in terms of r (pi) and state its units.
14 cm
Circumference of Circle
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How to write 3 tenths and 5 tenths as a decimal

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

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?