Write the statement in symbolic form.The set of natural numbers is a subset of the integers.
A. N ? Z
B. N ? I
C. N ? Z
D. N ? I
Answer: C
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Write the comparison as a ratio in the form of a fraction.6 laps every 7 minutes
A. 
B. 
C. 
D. 
Find the missing factor.-6x8y3 = xy ? ?
A. x7y2 B. -6x9y4 C. -6x7y2 D. x9y4
Two planes leave an airport at the same time. Their speeds are 140 miles per hour and 150 miles per hour, and the angle between their courses is 38°. How far apart are they after 1.5 hours? ? Apply the rules regarding the use of significant digits after all computations are complete. ?
A. 182 mi B. 140 mi C. 150 mi D. 120 mi E. 112 mi
Find the angle ? between two nonvertical lines 
and 
. The angle ? satisfies the equation
?
?
where 
and 
are slopes of and , respectively.
(Assume that 
.)
?
: 5x - 4y = 5
: x + y = 1
?
Round your answer to one decimal place.
?
A. 83.7º
B. 84.7º
C. 85.7º
D. 86.7º
E. 87.7º