Solve.x2 + 4x = 9
A. -2 ± 2
B. 2 + 
C. -2 ± 
D. -1 ± 
Answer: C
Mathematics
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Write the number in expanded form.50,800
A. 5 thousands + 8 hundreds B. 580 ten thousands C. 5 ten thousands + 8 thousands D. 5 ten thousands + 8 hundreds
Mathematics
Find the specified quantity.Find the amplitude of y = -2 cos (4x - ?).
A. 4 B. 2 C. -8 D. ?
Mathematics
Find the slope of the polar curve at the indicated point.r = -8 cos ? - 9 sin ?, ? = ?
A. - 
B. - 
C. 
D. 
Mathematics
Solve the problem.Last year, Karl's average electricity bill was $96.19. Last month, his electricity bill was $135.21. How much above last year's average was last month's bill?
A. $39.12 B. $39.02 C. $29.02 D. $40.02
Mathematics