A circular table cloth has a radius of 2.5 feet. Kylie is sewing a piece of ribbon around the edge of the tablecloth. If Kylie has exactly enough ribbon, which measurement is closest to the length of the piece of ribbon in feet? WHO EVER ANSWERS THIS CORRECTLY GETS A 5 STAR VOTES AND BRAUNLITS

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?