The augmented matrix is in row-echelon form and represents a system of linear equations. Solve the system using backward substitution.
Write the solution as an ordered pair, if possible.
A. No solution
B. (-2, 3)
C. (-1, 3)
D. (-3, 1)
Answer: C
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Write the indicated function.Sue wants to put a rectangular garden on her property using 84 meters of fencing. There is a river that runs through her property so she decides to increase the size of the garden by using the river as one side of the rectangle. (Fencing is then needed only on the other three sides.) Let x represent the length of the side of the rectangle along the river. Express the garden's area as a function of x.
A. A(x) = 43x - 2x2
B. A(x) = 42x - 
x2
C. A(x) = 41x - 
x2
D. A(x) = 42x2 - x
Find an equation for the conic that satisfies the given conditions. Select the correct answer. parabola, vertex (0, 0), focus (0, –4)
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Solve the equation. Give a general formula for all the solutions.cos ? - 1 = 0
A. {?|? = ? + 2k?}
B. {?|? = 2k?}
C. 
D. 
Find the indicated probability.One card is selected from a standard deck of cards. Find the probability that the card selected is the 7 of hearts.
A. 
B. 
C. 
D. 