Provide an appropriate response.The function f(x) = 0.81x + 168.3 models the cholesterol level of an American woman as a function of her age, x, in years. Use the function to find f(29).
A. 191.79
B. 3953.367
C. 198.11
D. 144.81
Answer: A
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Use Gaussian elimination to solve the linear system by finding an equivalent system in triangular form.
A. (-2, 2, -5) B. (-2, -5, 2) C. no solution D. (2, -5, -2)
Find the perimeter (or circumference) and area of the figure.Give the exact value and an approximation using ? ? 3.14.
A. circumference = 5.5? ? 34.54 ft area = 121? ? 379.94 sq ft B. circumference = 5.5? ? 34.54 ft area = 30.25? ? 94.99 sq ft C. circumference = 11? ? 34.54 ft area = 121? ? 69.08 sq ft D. circumference = 11? ? 34.54 ft area = 30.25? ? 94.99 sq ft
Solve the problem.Assume that the elevation E, in feet, of a sag in a proposed route is given by 
where x represents the horizontal distance in feet along the proposed route and 0 ? x ? 5000. For what x-values is the elevation 1300 feet or more? Round your answer to the nearest foot.
A. x < 617 ft or x > 9697 ft B. x < 607 ft or x > 9687 ft C. x < 607 ft or x > 9697 ft D. x < 617 ft or x > 9687 ft
Multiply.-9x ? 7x
A. -63x B. -126x C. -126x2 D. -63x2