- Mon Aug 31, 2015 3:12 pm
- Forum: Beginning Algebra
- Topic: When A,B and C work together, B does 4/15 of the work.
- Replies:
**2** - Views:
**21**

To complete a certain job, B and C (working together) take 50% more days than A, B, and C (working together); for example, if A+B+C take 10 days, then B+C take 15 days. If the 2 take 50% more days then they take 1.5 = 3/2 as long. Let's say it take "d" days to do whatever is "the job...

- Sun Aug 23, 2015 3:48 pm
- Forum: Geometry
- Topic: Need help with an Area question: "You are to build two separate enclosures..."
- Replies:
**1** - Views:
**43**

1. You have been given two lengths of fencing. 2. One is exactly 246.54918439354108 meters in length; the other is exactly 393.5680673801993 meters. 3. You are to build two separate enclosures - one enclosure for each of the lengths of fencing. 4. The area of each enclosure must be the maximum obta...

- Sun Aug 23, 2015 3:41 pm
- Forum: Beginning Algebra
- Topic: need help with this one: 627.552601=50.102x-x^2
- Replies:
**1** - Views:
**37**

Do like they told you here: plug into the Quadratic Formula. What did you get when you did this? Please show all your work so we know where you're getting stuck. Thanx.

- Sun Aug 09, 2015 6:00 pm
- Forum: Statistics
- Topic: Confused about how to factor this
- Replies:
**1** - Views:
**156**

I'm reading something that contains the following line of maths, and I can't yet see how they make the leap to the second expression.... \mathbb{E}\left[\dfrac{q_1 R}{\bar{R}}\right]\, -\, q_1 \mathbb{E}\left[\dfrac{q_1 q_2 \left(R_1 \, -\, R_2 \right)}{\bar{R}}\right] Additional informatio...

- Wed Aug 05, 2015 10:50 pm
- Forum: Beginning Algebra
- Topic: Graphing a line given it's equation
- Replies:
**1** - Views:
**87**

Please help I have been trying to understand this since Saturday. y=3/4x then I have to draw a line and give three points :shock: The way you wrote this means like this: y\, =\, \dfrac{3}{4x} Did you maybe mean like this? y\, =\, \dfrac{3}{4}x If the 2nd one, try here to learn how to do the graph. ...

- Wed Aug 05, 2015 10:47 pm
- Forum: Uncategorized
- Topic: making cubes
- Replies:
**7** - Views:
**235**

You have an unlimited supply of black, red and white unit (1x1x1) cubes. Use any 8 of these cubes to create different 2x2x2 cubes. What is the maximum number of these cubes that you can create? I get 27 as answer. Can anyone confirm? How are different 2-by-2-by-2 cubes defined as "different&qu...

- Sun Jul 12, 2015 4:38 pm
- Forum: Trigonometry
- Topic: Determining exact values for "Special trigonometric expressions"
- Replies:
**1** - Views:
**75**

Mainstrain wrote:2cos 45* x sin45*

i got this far, 2 square root3/2 x square root2/2 but am not sure what the next step is?

Multiply and simplify like you did back in algebra.

- Sun Jul 12, 2015 4:37 pm
- Forum: Trigonometry
- Topic: Reciprocal trigonometric ratios
- Replies:
**5** - Views:
**92**

ok i did 1/tan(3.2404) and got 17 which is the correct answer, however when i went to the second problem i did 1/sin(1.2711)and got 45 You have a tan -1 key on your calculator but not a cot -1 . To find the inverse of the cotangent you have to convert to tangent form. Why are you converting the sin...

- Sun Jul 12, 2015 4:35 pm
- Forum: Intermediate Algebra
- Topic: Urgent problem, (simple?) linear programming,
- Replies:
**4** - Views:
**219**

What have you done so far?

- Fri Jul 10, 2015 12:35 pm
- Forum: Advanced Algebra ("pre-calculus")
- Topic: Geometric Sequences help
- Replies:
**2** - Views:
**223**

I feel like I'm spending an unnecessary amount of time guessing and checking for the common ratio. There isn't any guessing for common ratios. Just do the division and see if the answers match. Particularly when the majority of the numbers in the sequence are fractions. For example 27/64, 9/16, 3/4...