State the addition property illustrated by the given equation.20 + (-37 + 57) = (20 + (-37)) + 57
A. Identity
B. Commutative
C. Associative
D. Inverse
Answer: C
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Write the word phrase as an algebraic expression. Use x to represent the unknown number.The product of 14 and a number, added to 3
A. 42 + x B. 42x C. 14 + 3x D. 3 + 14x
Solve for x.16x = 1
A. x = 1
B. x = 
C. x = 0
D. ?
Find the vertex, the focus, and the directrix of the parabola.x2 - 10x + 8y + 1 = 0
A. V: (- 5, 3); F: (5, 1); D: y = 5
B. V: 
; F: (5, -5); D: y = -11
C. V: 
; F: (5, 5); D: y = 1
D. V: 
; F: (5, 1), D: y = 
Solve the problem.A bookstore is having a sale. All books included in the sale have a colored sticker on them to indicate the sale price. There are green stickers, red stickers, and orange stickers. Bob, Sue, and Fred each make purchases of books that are on sale. Each row of the table gives information about the numbers of book purchases and the total cost of the purchase (before taxes) . 
Use this information to set up a matrix equation of the form 
which can be solved to determine the price for each type of sale book. Solve this matrix equation to find the price
of a book with a red sticker.Use the fact that for A = 
, A-1 = 
.
A. $6.79
B. $6.50
C. $6.87
D. $6.99