The table can be used to determine the solution of equations, 2x - 2y = 6 and 4x + 4y = 28. Original
System
Equivalent
System
Sum of
Equations in
Equivalent
System
Solution
to
System
New
System
Using Sum
Solution to
New
System
4x + 4y = 28
2x-2y = 6
4x+4y = 28
4x - 4y = 12
4x + 4y = 28
8x = 40
8x = 40
Which solution can be used to fill in both blanks in the table?
(2,5)
(5,2)
(5,-8)
(-8,5)

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?