When designing a new school cafeteria, the school administrators planned for there to be twice as many tables in each row as
There are rows. After increasing the size of the cafeteria, it was decided to add 3 more rows of tables and to increase the
original number of tables in each row by 2. The maximum number of tables the cafeteria can hold is 126.
If rrepresents the original number of rows the school administrators planned to have in the cafeteria, which of the following
represents this situation?
A 22 +8r+62 126
B. 222 +7r+62 126
C. 212 +75+65 126
D. 2- + 8r+65 126

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?