- Mon Jun 22, 2015 8:21 pm
- Forum: Matrix (Linear) Algebra
- Topic: Reduced row ech help
- Replies:
**1** - Views:
**91**

The problem is to turn [1 1 1 5] [2 2 2 14] [6 6 6 30] into reduced row echelon form. My work and online calculators I have check yield [1 1 1 0] [0 0 0 1] [0 0 0 0] Yet the answer provided in the text book I am working from is [1 0 0 0] [0 0 0 1] [0 0 0 0] Which one is correct? Probably both are k...

- Thu Jun 18, 2015 1:57 am
- Forum: Intermediate Algebra
- Topic: Two equations with two unknowns
- Replies:
**2** - Views:
**128**

You have to get X and Y. \dfrac{p\, -\, y\, -\, \dfrac{x\, (h\, -\, x)}{y}}{h\, -\, x}\, =\, \dfrac{p\, -\, q}{h} x^2\, +\, y^2\, =\, a^2 You have 2 equations with 6 variables. It is not possible to solve for numerical values. Are you maybe supposed to solve for x and y (which are different...

- Wed Jun 17, 2015 10:58 am
- Forum: Advanced Algebra ("pre-calculus")
- Topic: How to solve an equation with a variable as exponent?
- Replies:
**1** - Views:
**64**

I'm asked to solve a problem with the equation 6^x = 24x^2 I don't think there is any way to do this with algebra. The left side is an exponential and the right side is a polynomial. You can see the formal solution here: http://www.wolframalpha.com/input/?i=solve+6^x+%3D+24x^2 (Copy and paste the l...

- Sat Jun 13, 2015 3:03 pm
- Forum: Advanced Algebra ("pre-calculus")
- Topic: How to Determine which circle has the larger radius by inspection?
- Replies:
**1** - Views:
**70**

A problem is given with two equations for a circle and I am asked to determine which has the larger radius. I know how to solve the problem by calculation and answered correctly. But I want to know is there a way to distinguish which circle has the larger radius at first glance without solving exte...

- Sat May 30, 2015 12:34 am
- Forum: Beginning Algebra
- Topic: ounces of a 50% solution must be mixed with 80 ounces of a 20% solution
- Replies:
**1** - Views:
**132**

How many ounces of a 50% solution must be mixed with 80 ounces of a 20% solution to make a 40% solution? How do I set this up? AJ You can learn how to set this up by studying this lesson . Then use their method: ounces solution: 50%: x 20%: 80 40%: x + 80 percent solute:: 50%: 0.5 20%: 0.2 40%: 0.4...

- Tue May 19, 2015 5:47 pm
- Forum: Discrete Math
- Topic: Probability Question
- Replies:
**1** - Views:
**145**

...9% of men are color blind. For four randomly selected men, find the probability that a. the first three are not color blind and the fourth is color blind? For any random guy, what is the probability that he's color-blind? What is the probability that he is not color-blind? Does one random guy's ...

- Sun May 17, 2015 12:48 am
- Forum: Intermediate Algebra
- Topic: How to reduce this rational expression to its lowest term?
- Replies:
**2** - Views:
**146**

\dfrac{a^3\, -\, b^3}{a\, -\, b} The answer is suppose to be a^2\, +\, ab\, +\, b^2 I've tried to factor a^3\, -\, b^3 but it still didn't lead up to the answer. What steps are required here? Apply the formula for factoring differences of cubes . That, or do the long polynomial division . :clap:

- Wed Apr 15, 2015 4:56 pm
- Forum: Statistics
- Topic: Normal Deviation junk
- Replies:
**3** - Views:
**284**

80 is two deviations from the mean. How do I find out the percentage when no other info is given? I'm sorry; I'd assumed that your class had covered normal distributions already. To learn about percentages related to deviations, try here or here . After you've studied the two lessons, paying close ...

- Sun Apr 12, 2015 2:14 am
- Forum: Statistics
- Topic: Normal Deviation junk
- Replies:
**3** - Views:
**284**

A normal distribution has a mean of 100 and a standard deviation of 10. Find the probability that a value selected at random is in the given interval: from 80 to 100 How in the world am I suppose to draw one if I don't have the info? There is nothing in the instructions about drawing a picture. Ins...

- Mon Mar 30, 2015 5:23 pm
- Forum: Beginning Algebra
- Topic: Linear independence & linear dependence
- Replies:
**1** - Views:
**444**

Suppose that vectors v1,v2,v3 are linearly independent. (i) Prove that v1-v2, v2-v3 and v3-v1 are linearly dependent. (ii) Prove that v1+v2, v2+v3 and v3+v1 are linearly dependent. I need you guys to help me solve this question.... To learn how to show linear dependence try here . Then set things u...