Triangle ABC is a right triangle with sides of lengths a, b, and c and a right angle at C. Find the indicated trigonometric function value of A. Rationalize denominators containing radicals.a = 7, b = 4; find sin A.
A. 
B. 
C. 
D. 
Answer: B
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Rewrite the fraction with the denominator indicated.Write 
with a denominator of 21.
A. 
B. 
C. 
D. 
Provide an appropriate response.Which one of the following is a description of the graph of the solution set for the system below?x2 + y2 ? 364x2 + 9y2 ? 36
A. The area outside the ellipse (defined by the second equation), including the border. B. The area inside the ellipse (defined by the second equation), including the border. C. The area outside the circle (defined by the first equation), including the border. D. None of these
Find the domain of the composite function f?g.f(x) = 5x + 45, g(x) = x + 5
A. (-?, 14) ? (14, ?) B. (-?, ?) C. (-?, -9) ? (-9, -5) ? (-5, ?) D. (-?, -14) ? (-14, ?)
Simplify the expression.
2
A. 3
B. 
C. 
D. 1