Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. 3x - 2y + 2z - w=2 4x + y + z + 6w=8-3x + 2y - 2z + w=55x + 3z - 2w=1
A. {(2, 0, - 
, 
)}
B. {(1, - 
, 
, 6)}
C. ?
D. {(
, 0, - 
, 
)}
Answer: C
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State whether the function is linear or quadratic.f(x) = 0.6x2 + 4x - 32
A. Linear B. Quadratic
Multiply.(x2 + x + 10)(x2 + x + 7)
A. x4 + 2x3 + 18x2 + 17x + 70 B. x4 + x3 + 17x2 + 17x + 70 C. x4 + 2x3 - 17x2 + 3x + 70 D. x4 + x3 - 16x2 - 17x + 70
Solve the problem. Round to an appropriate number of significant digits.Two different gasohol mixtures are available. One contains 5% alcohol and the other 12% alcohol. How much of each should be mixed to obtain 1500 gal of gasohol containing 10% alcohol?
A. 429 gal 5%, 1071 gal 12% B. 625 gal 5%, 875 gal 12% C. 1071 gal 5%, 1071 gal 12% D. 75 gal 5%, 180 gal 12%
The populations P (in thousands) of Horry County, South Carolina from 1970 through 2007 can be modeled by 
where t represents the year, with 
corresponding to 1970. Use the model to complete the table. Round your answer to two decimal
places. Year 1970 1980 1990 2000 2007 Population A. ?
| Year | 1970 | 1980 | 1990 | 2000 | 2007 |
| Population | 78.70 | 108.74 | 148.56 | 201.35 | 248.24 |
B. ?
| Year | 1970 | 1980 | 1990 | 2000 | 2007 |
| Population | 78.70 | 118.74 | 148.56 | 258.24 | 201.35 |
C. ?78.70
| Year | 1970 | 1980 | 1990 | 2000 | 2007 |
| Population | 78.70 | 158.56 | 148.56 | 201.35 | 248.24 |
D. ?
| Year | 1970 | 1980 | 1990 | 2000 | 2007 |
| Population | 78.70 | 211.35 | 158.56 | 201.35 | 248.24 |
E. ?
| Year | 1970 | 1980 | 1990 | 2000 | 2007 |
| Population | 78.70 | 258.24 | 258.24 | 211.35 | 148.56 |