Mariah and Shane both started to work on a math problem and were comparing their workin math class. Are both of their representations correct? Explain, and finish the math problem correctly to arrive at the correct answer. Math Problem Jessica's friend lent her S5. Later that day Jessica gave her friend back 1 dollars. Which ratlonal number represents the overall change to the amount of money Jessica's friend has? Mariah started the problem as follows: Shane started the problem as follows: -5-(-1) 13 = -5 +1-5 -5-(-1 (1:) --5+(1+) see attached pic

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?