Find all solutions of the equation in the complex number system.x2 + 25 = 0
A. {5, -5}
B. {12.5}
C. {5}
D. {5i, -5i}
Answer: D
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Solve the problem.Find the moment of inertia about the y-axis of the thin semicircular region of constant density 
bounded by the x-axis and the curve 
.
A. 
?
B. 320?
C. 160?
D. 
?
Solve.A rectangular box with volume 468 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 in feet. Express the cost of the box as a function of x and then graph this function. From the graph find the value of x, to the nearest hundredth of a foot, which will minimize the cost of the box.
A. 8.55 feet B. 8.63 feet C. 8.44 feet D. 7.92 feet
Solve.One end of a guy wire is attached to the top of a 12-foot pole and the other end is anchored into the ground 5 feet from the base of the pole. Find the length of the guy wire. If necessary, round to the nearest tenth foot.
5 ft
A. 17.7 ft B. 13.7 ft C. 17 ft D. 13 ft
Solve the problem.The cost of manufacturing clocks is given by c = 25(n + 9)1/2, where c is the cost in dollars and n is the number produced. What is the cost when no clocks are produced?
A. $15 B. $75 C. $25 D. $225