Rita and Jen are working on a school project together Rita has completed 0.3 of her portion and Jan has completed a portion as well use the model to complete the equation below and find out how much of the total project Rita and Jan have completed

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation

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?