Someone can help with algebra question?

Posted on 2014-12-19 07:08:00 in Math by NANCILY

1. What algebraic property does this statement show?

3 + (–7) = (–7) + 3

(Points : 5)
a. associative property
b. commutative property
c. closure property
d. symmetric property

2. Solve.

6x – 13 = 2x + 7

(Points : 5)
a. 2
b. 3
c. 5
d. 6

3. What is the slope of the line that passes through the points (3, 1) and (–2, 5)?

(Points : 5)
a. 5/4
b. -5/4
c. 4/5
d. -4/5

4. The sum of three consecutive integers is –27. What are the numbers?

(Points : 5)
{–5, –9, –13}
{–10, –9, –8}
{–7, –9, –11}
{–11, –13, –15}

5. Which equation can be used to solve the following word problem?

Jessica has 9 more nickels than dimes, and the total value of her coins is $1.50. How many nickels does she have? Let n represent the number of nickels.

(Points : 5)
0.10n + 0.05n + 9 = 1.50
0.10(n – 9) + 0.05n = 1.50
0.10n + 0.05(n + 9) = 1.50
0.10(n + 9) + 0.05n = 1.50

6. If A = {3, 5, 7, 9} and
B = {1, 2, 4, 6, 7, 9}
Find the intersection: A B.

(Points : 5)
a. {1, 2, 3, 4, 5, 6, 7, 9}
b. {1, 3, 5}
c. {2, 4}
d. {7, 9}

7. Select the pair of equations whose graphs are perpendicular.

(Points : 5)
A. 5x – 8y = 9
12x – 5y = 7

B. x + 6y = 8
y = 2x – 8

C. y = 2x – 7
x + 2y = 3

D. 2y = –3x + 5
2x + 3y = 4

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