Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. x + y + z = 7 x - y + 2z = 7
A. {(8, -3, 2)}
B. {(4, 1, 2)}
C. {(- 
z + 7, 
z, z)}
D. {(-3z + 14, 2z - 7, z)}
Answer: C
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Evaluate the expression for the given replacement values. Write the answer in simplest form.
for x = 
, y = 
, z = 
A. 
B. 
C. 
D. 
Solve the equation.log3
= x
A. 
B. 
C. 
D. 
Solve the problem. Round to the nearest cent.If $200,000 is to be saved over 13 years, how much should be deposited monthly if the investment earns 4.75% interest compounded monthly?
A. $929.16 B. $833.66 C. $682.16 D. $752.27
Solve the problem involving modeling with polynomial functions. 
The bar graph shows the number of dollars spent in Country X (in millions) on environmental protection programs during the years 1985 (x = 1), through 1995 
. A graphing calculator was used to find the polynomial functions that best fit these data.(quadratic) y ? -0.010x2 + 0.346x + 5.253(cubic) y ? 0.005x3 - 0.102x2 + 0.805x + 4.697(quartic) y ? -3.497 × 10-4x4 + 0.013x3 - 0.169x2 + 1.00x + 4.53Use these three functions to predict the
school enrollment for 1996. Compare the results to the actual value of $8.3 million. A. The quadratic function gives 7.833, the cubic function gives 7.511, and the quartic function gives 8.407. The quartic function is the best predictor in this case. B. The quadratic function gives 7.407, the cubic function gives 7.965, and the quartic function gives 8.309. The quartic function is the best predictor in this case. C. The quadratic function gives 7.965, the cubic function gives 8.309, and the quartic function gives 7.407. The cubic function is the best predictor in this case. D. The quadratic function gives 8.407, the cubic function gives 7.833, and the quartic function gives 7.511. The quadratic function is the best predictor in this case.