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. 7.92 feet
D. 8.44 feet
Answer: A
Mathematics
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Solve the problem.Use the formula Zt = 
to find the total impedance in a parallel circuit for the given values of Z1 and Z2.Z1 = 10(cos 90° + i sin 90°)Z2 = 2(cos 60° + i sin 60°)
A. 1.7(cos 69.1° + i sin 69.1°) B. 1.7(cos 134.7° + i sin 134.7°) C. 1.7(cos 140.9° + i sin 140.9°) D. 1.7(cos 64.9° + i sin 64.9°)
Mathematics
Solve the equation.
- 
= 
A. {10} B. {-2} C. {-4} D. {2}
Mathematics
Provide an appropriate response.If 4 
+ 2
= 
, then
A. x = 0 and y = 4.
B. x = 4 and y = -5.
C. x = 
and y = 
.
D. x = 0 and y = 0.
E. There are no values for x and y which satisfy the equation.
Mathematics
Graph the function.y = -2x2
A. 
B. 
C. 
D. 
Mathematics