Solve.From a point on a river, two boats are driven in opposite directions, one at 10 miles per hour and the other at 5 miles per hour. In how many hours will they be 30 miles apart?
A. 2 hr
B. 4 hr
C. 6 hr
D. 10 hr
Answer: A
Mathematics
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Find 
and 
.f(x, y) = 4x - 6y2 - 9
A. 
= 4x; 
= -12y
B. 
= -12y; 
= 4
C. 
= 4; 
= -12y
D. 
= -5; 
= -12y - 9
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A. True B. False
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Determine the reference angle for the given angle.? = 
A. 
B. 
C. 
D. 
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First, write the value(s) that make the denominator(s) zero. Then solve the equation.
+ 1 = 
A. x ? -1; {11} B. x ? -1; {5} C. x ? 1; {5} D. x ? 1; ?
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