Provide an appropriate response.The energy it takes to lift an object with a mass of 9 kg from level y1 to level y2 is 9gy2 - 9gy1, where g is a constant. Factor this expression.
A. 
(y2 - y1)
B. 
(y2 - y1)
C. 9g(y2 - y1)
D. 9(y2 - y1)
Answer: C
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Provide an appropriate answer.Suppose that x2 + y2 = r2 and x = r cos ?, as in polar coordinates. Find 
r.
A. 
r= -r sin ?
B. 
r= r(cos ? - sin ?)
C. 
r= 0
D. 
r= r cos ?
Solve using matrices.A chemist has prepared two acid solutions, one which is 4% acid by volume and the other which is 11% acid. How many cubic centimeters of each should the chemist mix together to obtain 50 cm3 of 
-acid solution?
A. 4%-solution: 3.4 cm3; 11%-solution: 46.6 cm3 B. 4%-solution: 20 cm3; 11%-solution: 20 cm3 C. 4%-solution: 30 cm3; 11%-solution: 20 cm3 D. 4%-solution: 20 cm3; 11%-solution: 30 cm3
Solve the problem.226 chocolates are to be packed into boxes which will each contain 8 chocolates. How many boxes of chocolates will there be? How many chocolates will be left over?
A. 28 boxes; no chocolates left over B. 27 boxes; 2 chocolates left over C. 28 boxes; 2 chocolates left over D. 27 boxes; 3 chocolates left over
Multiply and simplify.
? 
A. - 
B. - 
C. - 
D. - 