Use back-substitution to solve the system of linear equations.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
Answer: A
Mathematics
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Find the slope of a straight line that passes through the given pair of points.(-7, -6) and (-5, -9)
A. - 4
B. - 
C. - 
D. - 
Mathematics
Perform the indicated operation and, if possible, simplify.
A. 
B. 
C. - 
D. 
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Factor completely. If the polynomial is prime, so state.72x2 + 42xy + 6y2
A. (18x + 6y)(4x + y) B. 6(3x - y)(4x - y) C. 6(3x + y)(4x + y) D. prime
Mathematics
0 ? t < 
and sin t is given. Use the Pythagorean identity sin2 t + cos2 t = 1 to find cos t.sin t = 
A. 
B. 
C. 
D. 
Mathematics