In recent years, US, tennis participation has increased. The function
= 23.7624(1. 0752)", where T(x)is in
millions and x is the
number of years since
2006, models the number of people who have
played tennis at least once. Estimate the
number who had played tennis at least once in
a year for 2014

Can someone me out here and the tell me the greatest common factor

Witch represents the inverse of the function f(x)=1/4x-12

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?