Solve the system by using Gaussian elimination with backward substitution or by reducing the matrix to reduced-row echelon form.-7x - 6y = 51-14x = 49 + 12y
A. (-3, -5)
B. (-3, -9)
C. No solution
D. (27, -9)
Answer: C
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Use a graphing calculator to determine which expression completes the identity.The expression 
is to be the left hand side of an equation that is an identity. Which one of the following four expressions can be used as the right hand side of the equation to complete the identity?
A. tan2x B. sec2x C. csc2x D. -cos2x
Add or subtract. Simplify your answer to lowest terms.
+ 
A. 
B. m - 5
C. m + 5
D. m - 6
Graph the function.y = sec 
A. 
B. 
C. 
D. 
Solve the problem.A field microphone used at a soccer game has a parabolic cross section and is 20 inches wide at the opening. The focus is 9 inches from the vertex. Find the depth of the microphone.
A. 11.11 in. B. 44.44 in. C. 2.78 in. D. 1.23 in.