Write the standard form of the equation of the circle.Center (-9, 0), r = 12
A. (x - 9)2 + y2 = 144
B. x2 + (y - 9)2 = 12
C. x2 + (y + 9)2 = 12
D. (x + 9)2 + y2 = 144
Answer: D
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A. x = -3, y = -3 B. No solution C. x = -2, y = -4 D. x = -2, y = -3
Perform the indicated operations.Estimate by rounding so that there is only one nonzero digit, then find the actual sum.3,415 + 172 + 97 =
A. Estimate: 4300 Actual: 3682 B. Estimate: 3000 Actual: 3694 C. Estimate: 3300 Actual: 3684 D. Estimate: 3200 Actual: 3587
When a company creates value for customers by performing key activities BETTER than its competitors, the firm is said to possess a
A. competitive advantage B. tangible resource C. market share advantage D. positive return for shareholders
Solve the problem.The function f(x) = 900(0.5)x/70 models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. Find the amount of radioactive material in the vault after 
Round to the nearest whole number.
A. 707 pounds B. 303 pounds C. 286 pounds D. 579 pounds