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by maggiemagnet
Mon Jun 22, 2015 8:21 pm
Forum: Matrix (Linear) Algebra
Topic: Reduced row ech help
Replies: 1
Views: 81

Re: Reduced row ech help

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...
by maggiemagnet
Thu Jun 18, 2015 1:57 am
Forum: Intermediate Algebra
Topic: Two equations with two unknowns
Replies: 2
Views: 117

Re: Two equations with two unknowns

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...
by maggiemagnet
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: 48

Re: How to solve an equation with a variable as exponent?

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...
by maggiemagnet
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: 54

Re: How to Determine which circle has the larger radius by inspection?

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...
by maggiemagnet
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: 131

Re: ounces of a 50% solution must be mixed with 80 ounces of a 20% solution

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...
by maggiemagnet
Tue May 19, 2015 5:47 pm
Forum: Discrete Math
Topic: Probability Question
Replies: 1
Views: 142

Re: Probability Question

...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 ...
by maggiemagnet
Sun May 17, 2015 12:48 am
Forum: Intermediate Algebra
Topic: How to reduce this rational expression to its lowest term?
Replies: 2
Views: 145

Re: How to reduce this rational expression to its lowest term?

\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:
by maggiemagnet
Wed Apr 15, 2015 4:56 pm
Forum: Statistics
Topic: Normal Deviation junk
Replies: 3
Views: 282

Re: Normal Deviation junk

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 ...
by maggiemagnet
Sun Apr 12, 2015 2:14 am
Forum: Statistics
Topic: Normal Deviation junk
Replies: 3
Views: 282

Re: Normal Deviation junk

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

Re: Linear independence & linear dependence

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...

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