Special products can be illustrated by using areas of rectangles. Use the figure to justify the special product 
Give the monomial that represents the sum of the areas of the gray rectangles.
A. a2
B. ab
C. b2
D. 2ab
Answer: D
Mathematics
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Solve the problem.A right triangular plate of base 4 m and height 2 m is submerged vertically, as shown below. Find the force on one side of the plate. 
4 m
A. 78,000 N B. 39,000 N C. 13,000 N D. 52,000 N
Mathematics
Find the expression.u = 9i + j, w = i - 9j ; Find 8u - 6w.
A. 24i + 62j B. 66i + 62j C. 66i - 46j D. 66i + 9j
Mathematics
Match to the equivalent expression.1000-7/3
A. 
B. -10,000,000
C. - 
D. 10,000,000
Mathematics
Write the conjugate 
of the complex number z. Then find z
.z = 1 + 7i
A. 
= 1 - 7i, z
= -48
B. 
= 1 - 7i, z
= 1 - 49i2
C. 
= 1 - 7i, z
= 50
D. 
= 1 - 7i, z
= 1 - 49i
Mathematics