Abusinessman was comparing his company's profits for two consecutive months. in november, n, were 0.04 thousand dollars more than in december, d. the two months had a combined income of 3.15 thousand dollars. which system of equations could be used to determine the amount of profit for each month, in thousands of dollars? a)n+d = 3.15 n+0.04=d b) n-3.15=d d+0.04=n c) d-3.15=n n+0.04=n d)n+d=3.15 d=0.04=n

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?