Saturday, July 17th, 2010
Here’s how you solve this type of question:
- Start with an equation like 3x + 5y = 15
- Move 3x to the other side, so 5y = 15 – 3x
- Divide both sides by 5, so y = 3 – x
- Another way of writing this is y = -.6x + 3, or y=mx = b, where m=-0.6 and b = 3
- If m = -0.6, that means that the slope =-0.6
Saturday, July 17th, 2010
Solution:
- 2(x – 5) = -11
- 2x – 10 = -11
- 2x = -1
- x = -0.5
Saturday, July 17th, 2010
Solution:
This is a well known “trick question”. It’s simply a series of squares with the digits reversed:
12 = 1 => 1
22 = 4 => 4
32 = 9 => 9
42 = 16 => 61
52 = 25 => 52
62 = 36 => 63
72 = 49 => 94
82 = 64 => 46
92 = 81 => 18
Saturday, July 17th, 2010
Here’s how you solve this type of question:
- The base of the 3D rectangle is in the shape of a 2D rectangle.
- Multiply the length of this 2D rectangle by its width to let the area
Saturday, July 17th, 2010
Solution:
The arithmetic mean is the average.
http://en.wikipedia.org/wiki/Arithmetic_mean
Saturday, July 17th, 2010
Solution:
Volume of wood is 72*54*48 = 186,624 cmcube; the mass would be 186,624 * 0.9 = 167,961.6 g.
Saturday, July 17th, 2010
42 + 52 =16 + 25 = 41
Saturday, July 17th, 2010
- In the above example, y=g(w), b=1 and m=-4. If we replace each of the terms we can rewrite the above as y=b+mx
Saturday, July 17th, 2010
Solution:
- Total number of complaints = 8400
- Percentage of the above that were related to auto repair and service = 10.3%
- Number of complaints related to auto repair and service =3D 8400 x 10.3% = 8400 x 0.103 = 865
Please note that we rounded off the answer to the nearest integer since the number of complaints must be an integer.
Friday, July 16th, 2010
Solution:
To calculate 2 times the square root of 45 (2sqrt(45)), you just need to calculate the square root of 45 and then multiply it by two:
Step1: 2 x sqrt (45)
Step 2: 2 x 6.708
Step 3: 13.416
We used a calculator to get obtain the square root of 45. Are you allowed to use a calculator? If not, we can show you how to calculate this manually.