Write a recursion formula for the sequence.81, 9, 3, 
, . . .
A. an = (an-1)2, a1 = 81
B. an = 
, a1 = 81
C. an = 
, a1 = 81
D. an = 3an-1, a1 = 81
Answer: C
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When an object falls subject to air resistance, its velocity V satisfies the equation of change
.
?
Here time is measured in seconds and velocity in feet per second, and the variable r is known as the drag coefficient.
?
A: Terminal velocity for an average-sized man is 179 feet per second. Use this fact to calculate the value of the drag coefficient for an average-sized man. Suggestion: When terminal velocity is reached, 
is 0. Round your answer to two decimal places.B: An ordinary coffee filter has a terminal velocity of about 6 feet per second. Find the drag coefficient for a coffee filter. Round your answer to two decimal places.C: Based on your answer to parts A and B, would you expect the drag coefficient for a rock to be larger or smaller than that for a man?
What will be an ideal response?
Provide an appropriate response.Solve the system of equations using the substitution method:x - 4y = 3-2x + 8y = -6
A. x = 0, y = - 
B.
dependent; many solutions
C.
inconsistent; no solution
D.
x = 3, y = 0
List the factors of the number.56
A. 1, 2, 4, 7, 8, 14, 28, 56 B. 1, 2, 3, 4, 7, 8, 14, 18, 28, 56 C. 2, 4, 7, 8, 14, 28 D. 1, 2, 4, 7, 8, 14, 18, 28, 56
Provide an appropriate response.If a < b, is it always true that 
> 
? Explain.
What will be an ideal response?