Solve the problem.A figure skater must trace a figure eight on the ice that consists of two perfect circles, each with a radius of 9 ft. How far does the skater go in tracing the figure eight?(Use 3.14 for ? .)
A. 28.26 ft
B. 113.04 ft
C. 26.26 ft
D. 56.52 ft
Answer: B
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Solve the system of equations by use of determinants. 5x - 4y - z = 4 x - 4y + 8z = 14 4x + y + z = 11
A. x = 2, y = -1, z = -2 B. x = 3, y = -1, z = 2 C. x = 1, y = 2, z = 1 D. x = 2, y = 1, z = 2
Use Descartes's Rule of Signs to determine the possible numbers of positive and negative zeros of the function. ? 4x5 - 8x ?
A. One negative zero B. One negative zero or three positive zeros C. Two negative zeros or no positive zero D. One positive zero, one negative zero E. One negative zero, four negative zeros
Factor the difference of squares.25k2 - 49m2
A. (5k + 7m)(5k - 7m) B. (5k + 7m)2 C. (25k + m)(k - 49m) D. (5k - 7m)2
Write a cost function for the problem. Assume that the relationship is linear.A cable TV company charges $22 for the basic service plus $7 for each movie channel. Let C(x) be the total cost in dollars of subscribing to cable TV, using x movie channels.
A. C(x) = 7x - 22 B. C(x) = 22x - 7 C. C(x) = 7x + 22 D. C(x) = 22x + 7