Multiply. Write the result in the form a + bi.(7 + 4i)(7 - 4i)
A. 65
B. 49 - 16i2
C. 49 - 16i
D. 33
Answer: A
Mathematics
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Calculate the area of the surface S.S is the lower portion of the sphere x2 + y2 + z2 = 81 cut by the cone z = 
A. 18
?
B. 162
?
C. 81
D. 81
?
Mathematics
Draw a diagram to illustrate the following number.2
What will be an ideal response?
Mathematics
Simplify the expression. Use positive exponents. Assume variables represent nonzero real numbers.
A. t10 B. t-10 C. t-4 D. t4
Mathematics
Graph.h(x) = -0.25x2 + 1
A. 
B. 
C. 
D. 
Mathematics