Simplify. Write your answers in the form of a+bi, where a and b are real numbers.(2 + 4i)(2 - 4i)
A. -12
B. 4 + 16i
C. 4 - 16i
D. 20
Answer: D
Mathematics
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Find the standard-form equation of the hyperbola centered at the origin which satisfies the given conditions.Vertices at (0, 4) and (0, -4); foci at (0, 9) and (0, -9)
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Mathematics
Write the sentence as an equation. Use x to represent "a number."Nine subtracted from a number gives 44.
A. 44 - 9 = x B. x - 9 = 44 C. 9 - x = 44 D. 9 + x = 44
Mathematics
If r is a positive number and the point (x, y) is in the indicated quadrant, decide whether the given ratio is positive or negative.III, 
A. Negative B. Positive
Mathematics
Write the number in standard form.2.0365 × 10-7
A. 0.0000020365 B. -203,650,000 C. 0.000000020365 D. 0.00000020365
Mathematics