Solve the problem.A local office supply store has an annual demand for 10,000 cases of photocopier paper per year. It costs 
per year to store a case of photocopier paper, and it costs 
to place an order. Find the optimum number of cases of photocopier paper per order.
A. 1183
B. 1,400,000
C. 374
D. 837
Answer: A
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Use the requested method to find the product.720 ? 78; use the lattice method
A. 56,150 B. 56,170 C. 56,160 D. 56,260
Let U = {3, 4, 9, 10, 14, 18, 19, 22}, A = {3, 4, 10, 18}, B = {9, 14}, and C = {10, 18, 22}. Find (A?B')?(C?A').
 figure 1.png)
Solve the problem.A jet plane moving at constant speed travels 1000 miles with the wind and then 1200 miles against the wind. If the speed of the wind is 50 mph and the total flight takes 5 hours, find the speed of the plane.
A. 500 mph B. 100 mph C. 400 mph D. 450 mph
Rotate the axes so that the new equation contains no xy-term. Discuss the new equation.31x2 + 10
xy + 21y2 -144 = 0
A. ? = 30°
+ 
= 1
ellipse
center at (0, 0)
major axis is y'-axis
vertices at (0, ±3)
B. ? = 45°
x'2 = -4
y'
parabola
vertex at (0, 0)
focus at (0, -
)
C. ? = 45°
y'2 = -4
x'
parabola
vertex at (0, 0)
focus at (-
, 0)
D. ? = 36.9°
+ 
= 1
ellipse
center at (0, 0)
major axis is x'-axis
vertices at (±3, 0)