13. Multiply the following polynomials and simplify:
(9x5 + 7x4 + 3x)(8x5 + 6x2)
72x10 + 56x9 + 54x7 + 66x6 + 18x3
(1x3 + 7x)(6x4 + 5x3 - 9)
6x7 + 5x6 + 42x5 + 35x4 - 9x3 - 63x
14. Divide:
4x2 - 18x + 31 / 2x - 8
(2x - 1) with a remainder of 23
15. Find the greatest common factor of the following terms:
48, 54, 55
1
90x2y9, 52x2y9, 39x
x
16. Factor the following polynomials:
12x3 - 6x2 - 60x
12x(x + 2)(x -
5
2
)
x2 - 6x - 7
(x + 1)(x - 7)
x4 - 9x3 - 90x2
x2(x + 6)(x - 15)
17. For question 16, exercises b) and c), solve for x:
x =
-1
and
7
x =
0
,
-6
and
15
18. You have 5 CDs. How many different ways can you listen to them?
120
19. Use the following data to construct a box and whiskers plot:
21, 11, 36, 8, 10, 25, 14, 18, 32
20. A bag contains 4 blue balls, 4 red balls, and 6 white balls. You pick a ball from the bag and put it in your pocket. What is the probability of picking:
A white ball?
42.86%
A blue ball or red ball?
57.14%
Two red balls?
6.59%
A blue ball and a white ball?
13.19%
21. Solve and graph the following systems of linear equations:
x + y = 6 x - y = 11
A(8.5,-2.5)
10x - 12y = 18 2x + 3y = -18
B(-3,-4)
22. Write the following fractions in simplest form:
16x5y10
32x4y6
xy4
2
x(x - 4)
x8 - 14x7 + 40x6
1
x5(x - 10)
23. Solve the equation below in two different ways. First, solve it using the quadratic formula. Secondly, solve it by completing the square.
24x = x2 + 63
x1 = 3, x2 = 21
24. Convert the following repeating decimal into a fraction:
x =
0.4
4
9
25. Solve the following equation:
-
x - 10
+ 18 = 10
x = 74
26. Rationalize the denominator of each fraction below:
6
2
- 25
-
6
2
+ 150
623
27. Use a trigonometric ratio to find x:
x = 29.00 cm
28. The sum of two consecutive odd integers is 24. What are the integers? (Hint: use 2x+1 as the first odd integer)
a=11, b=13
29. After you leave your house, you walk 15 blocks east and 8 blocks north. How far are you from your house?
I am
17
blocks from my house.
30. The sides of a square are increased by 4 m. The area of the newly created square is 49m2. What was the original length of one side of the square?
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