A matrix has an inverse if and only if its determinant does not equal 0. Determine whether the given matrix has an inverse.
A. Yes
B. No
Answer: A
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Solve the problem.The radius of a circle is 
in. Find its circumference.
A. 
? in
B. 
? in
C. 
? in
D. 
? in
Use Descartes' rule of signs to find the number of possible positive, negative, and nonreal roots for the following equation.
?
?
A. 1 positive; 1 negative; 7 nonreal B. 1 positive; 0 negative; 8 nonreal C. 0 positive; 1 negative; 8 nonreal D. 0 positive; 0 negative; 9 nonreal E. none of these
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 = 10, b = 7; find cos A.
A. 
B. 
C. 
D. 
Evaluate the trigonometric function of the given quadrantal angle. If the value is undefined, write "undefined."cos 
A. 1 B. undefined C. -1 D. 0