Determine whether the given number is approximate or exact.The blackboard in the mathematics classroom is 81 inches long.
A. Exact
B. Approximate
Answer: B
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Solve the equation in the real number system.x4 - 21x2 - 100 = 0
A. {-2, 2} B. {-10, 10} C. {-5, -2, 2, 5} D. {-5, 5}
Solve the problem.A rectangular box with volume 488 cubic feet is built with a square base and top. The cost is $1.50 per square foot for the top and the bottom and $2.00 per square foot for the sides. Let x represent the length of a side of the base. Express the cost the box as a function of x.
A. C(x) = 2x2 + 
B. C(x) = 4x + 
C. C(x) = 3x2 + 
D. C(x) = 3x2 + 
Solve.The product of a number and -4 is equal to twice the sum of that number and -24. Find the number.
A. 4 B. -4 C. 8 D. -8
Find the slope and the y-intercept of the line.y = -6
A. Slope 0; y-intercept (0, 0) B. Slope -6; y-intercept (0, 0) C. Slope undefined; y-intercept (0, -6) D. Slope 0; y-intercept (0, -6)