Solve the problem.The amount of gas that a helicopter uses is directly proportional to the number of hours spent flying. The helicopter flies for 3 hours and uses 39 gallons of fuel. Find the number of gallons of fuel that the helicopter uses to fly for 4 hours.
A. 65 gallons
B. 56 gallons
C. 12 gallons
D. 52 gallons
Answer: D
Mathematics
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Solve the problem.Suppose r = 
, v = 
, and w = 
. Find v ? w.
A. 32
B. 
C. 
D. -18
Mathematics
Write out the first five terms of the sequence.an = 
A. 
, - 
, - 
, - 
, - 
B. 
, - 
, 
, - 
, 
C. - 
, - 
, - 
, - 
, - 
D. 
, 
, 
, 
, 
Mathematics
Use the order of operations to simplify the expression.
+ 
? 
A. 
B. 
C. 
D. 
Mathematics
Determine whether the graph of the equation is symmetric with respect to the x-axis, the y-axis, and/or the origin.y2 - x - 9 = 0
A. x-axis B. origin C. y-axis D. x-axis, y-axis, origin E. none
Mathematics