13. Multiply the following polynomials and simplify:
(1x3 - 8)(5x5 + 3x - 10)
5x8 - 40x5 + 3x4 - 10x3 - 24x + 80
(9x5 + 10)(5x5 + x2 + 8x)
45x10 + 9x7 + 72x6 + 50x5 + 10x2 + 80x
14. Divide:
5x3 + 30x2 - 4x - 24 / x + 6
5x2 - 4
15. Find the greatest common factor of the following terms:
90, 84
6
30x10y8, 39xy3, 60x9
3x
16. Factor the following polynomials:
3x5 + 15x4 + 12x3
3x3(x + 4)(x + 1)
x2 + 6x - 27
(x - 3)(x + 9)
x8 + 3x7 - 18x6
x6(x - 3)(x + 6)
17. For question 16, exercises b) and c), solve for x:
x =
3
and
-9
x =
0
,
3
and
-6
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:
26, 2, 5, 22, 40, 25, 11, 4
20. A bag contains 4 blue balls, 4 red balls, and 2 white balls. You pick a ball from the bag and return it to the bag. What is the probability of picking:
A white ball?
20.00%
A blue ball or red ball?
80.00%
Two red balls?
16.00%
A blue ball and a white ball?
8.00%
21. Solve and graph the following systems of linear equations:
x + y = 3 x - y = 16
A(9.5,-6.5)
2x - 3y = 13 13x + 6y = 8
B(2,-3)
22. Write the following fractions in simplest form:
22x6y7z4
44x7y9z2
z2
2xy2
(x2 + 6x + 9)
(x + 3)
x + 3
23. Solve the equation below in two different ways. First, solve it using the quadratic formula. Secondly, solve it by completing the square.
x2 - 14x = -33
x1 = 3, x2 = 11
24. Convert the following repeating decimal into a fraction:
x =
0.39
36
90
25. Solve the following equation:
-13
x
- 2 = -16
x
+ 7
x = 9
26. Rationalize the denominator of each fraction below:
35
10
7
10
2
27. Use a trigonometric ratio to find x:
x = 33.49 cm
28. The sum of two consecutive odd integers is 40. What are the integers? (Hint: use 2x+1 as the first odd integer)
a=19, b=21
29. After you leave your house, you walk 12 blocks east and 9 blocks south. How far are you from your house?
I am
15
blocks from my house.
30. Each side of a square is lengthened by 6 m. This makes the area of the square 169m2. What is the original length of a side of the square?