Use an equation to solve the percent problem.34 is what percent of 20?
A. 170%
B. 17%
C. 1700%
D. 1.7%
Answer: A
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A cleaning process removes 5% of a contaminant from a water source each week. There are initially 595 pounds of the contaminant in the water source. ? A: Write a formula that gives the amount C, in pounds, of the contaminant in the water source after t weeks. ? B: How much contaminant remains after 9 weeks? ? C: Make a graph that shows the amount of contaminant over the first 20 weeks. ? D: When will the contaminant level reach 206.33 pounds? ? Round your answers to two decimal places if necessary. ?
What will be an ideal response?
Provide an appropriate response.Which of the following pairs of parametric equations will graph a semicircle?
A. x = cos t, y = sin t, 0 ? t ? 
B. x = cos 
t, y = sin 
t, 0 ? t ? ?
C. x = cos 2t, y = sin 2t, 0 ? t ? ?
D. x = cos 
t, y = sin 
t, 0 ? t ? 4?
Divide. If a repeating decimal is obtained, use notation such as 0.7 or 0.16.0.2 ÷ 0.3
A. 0.6
B. 0.006
C. 0.06
D. 6.
Solve the problem.A computer manufacturer has three outlet stores that sell its four computer systems. The following table shows the numbers of systems sold by the three stores in July.
The prices of the systems are: $1200 for System 1, $1500 for System 2, $1600 for System 3, and $1800 for System 4. Write the information from the table as a 4 x 3 matrix B. Write a row matrix A for which the entries represent the prices for the systems. If 
find c12. What does this entry of C represent?
A. c12 = 144,000. c12 represents the sales of System 2 at all stores in July. B. c12 = 176,000. c12 represents the total sales at Store 2 in July. C. c12 = 154,000. c12 represents the total sales at Store 1 in July. D. c12 = 164,000. c12 represents the total sales at Store 3 in July.