Find the LCM of the given numbers.20, 30, 40, 60
A. 108
B. 90
C. 60
D. 120
Answer: D
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Find the exact function value.cot-1(-1)
A. 
B. 
C. - 
D. - 
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 = 424 represent the initial number of bacteria present.
A. a1 = 424; an = 2 an-1 for n > 1.
B. an = 2 a1 for all values of n.
C. a1 = 424; an = 
an-1 for n > 1.
D. a1 = 424; an = 2 an+1 for n > 1.
Find the expected value.Mr. Cameron is sponsoring an summer concert. He estimates that he will make $300,000 if it does not rain and make $60,000 if it does rain. The weather bureau predicts the chance of rain is 0.34 for the day of the concert. An insurance company is willing to insure the concert for $150,000 against rain for a premium of $30,000. If he buys this policy, what are his expected earnings from the concert?
A. $180,000 B. $300,000 C. $270,000 D. $239,400
Refer to the figure with X the midpoint of side 
, Y the midpoint of side 
, XY = 5x- 4, and MO = 8x+16.
Find x.
(a) 112 (b) 56 (c) 12 (d) 6