The first plan plan charges a rate of 25 cents per minute. the second plan charges a monthly fee of $29.95 plus 12 cents per minute. how many minutes would you have to use in a month in order for the second plan to be preferable

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

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?