Simplify the expression.x9x2
A. x11
B. 18x
C. 11x
D. x18
Answer: A
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Evaluate the expression or indicate that the root is not a real number.-
A. -312 B. -25 C. 25 D. Not a real number
Solve the problem.The line graph shows the cost of inflation. What cost $5000 in 1980 would cost the amount shown by the graph in subsequent years. 
Below are two mathematical models for the data shown in the graph. In each formula, C represents the cost x years after 1985 of what cost $5000 in 1980. Model 1: C = 798x + 17,521 Model 2: C = -x2 + 820x + 18,017(i) Use the graph to estimate the cost in 2000, to the nearest thousand dollars, of what cost $5000 in 1980.(ii) Use model 1 to determine the cost in 2000. How well does this describe your estimate from part (i)?(iii) Use model 2 to determine the cost in 2000. How well does this describe your estimate from part (i)?
A. (i) about $28,000; (ii) about $29,491, reasonably well; (iii) about $28,452, reasonably well B. (i) about $29,000; (ii) about $29,491, reasonably well; (iii) about $30,092, reasonably well C. (i) about $30,000; (ii) about $30,289, reasonably well; (iii) about $30,912, reasonably well D. (i) about $27,000; (ii) about $28,693, reasonably well; (iii) about $29,272, reasonably well
Use a vertical shift to graph the function.y = -4 cos 
x - 2 
A. 
B. 
C. 
D. 
Stock prices on consecutive days for a stock are shown. Find the increase (decrease) in the price of each stock as a number and the percent increase (decrease) rounded to the nearest tenth of a percent.36.45, 37.21
A. 0.76; (2.1%) B. -0.76; (2.1%) C. 0.76; 2.1% D. -0.76; 2.1%