Solve the problem.For what values of x would the rectangle have a perimeter of at least 188? 2x + 3 
A. 19 or less
B. 9 or less
C. 19 or greater
D. 9 or greater
Answer: D
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Subtract using columns.Subtract (6x9 - 2x5 + 7x2 - 8) from (3x9 + 5x7 - 8x2 + 13) .
A. -3x9 + 5x7 - 2x5 - 15x2 + 21 B. 3x9 + 5x7 - 2x5 - 15x2 + 21 C. -3x9 + 5x7 + 2x5 - 15x2 + 21 D. 3x9 + 5x7 + 2x5 - 15x2 + 21
Solve the problem.Suppose that certain bacteria can double their size and divide every 30 minutes. Write a recursive sequence that describes this growth where each value of n represents a 30-minute interval. Let a1 = 420 represent the initial number of bacteria present.
A. a1 = 420; an = 
an-1 for n > 1.
B. a1 = 420; an = 2 an-1 for n > 1.
C. a1 = 420; an = 2 an+1 for n > 1.
D. an = 2 a1 for all values of n.
Solve the problem.If (a, 3) is a point on the graph of y = 2x - 5, what is a?
A. 4 B. -4 C. 1 D. -1
Write the complex number in the form a + bi.4 + 
A. 4 + 4i
B. 4 - 4i
C. 4 + 4i
D. 4 + 4