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by anonmeans
Sun Apr 03, 2016 10:07 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: solving for x, given exponentials: 4e^2x + 5e^3x = 15
Replies: 7
Views: 212

Re: solving for x, given exponentials: 4e^2x + 5e^3x = 15

denicarl wrote:difference of probabilities-actual numbers are

(1-e^(-.2x))-(1-e^(-.16x))=.5

e^(-.16x)-e^(-.2x)=.5 solve for x

Wolfram Alpha still gives a complicated answer. Assuming your equation is right, then maybe the homework is expecting a numerical approximation instead of an algebraic solution.
by anonmeans
Tue Mar 22, 2016 1:49 pm
Forum: Statistics
Topic: Simple probability question!
Replies: 2
Views: 172

Re: Simple probability question!

There are 2 boxes, box A contains 20 white balls and 20 black balls, box B contains 10 white balls and 5 black balls. A box is chosen at random then a ball is taken at random from the chosen box, what is the probability that the ball is white? First I thought, it should be the probability of box A ...
by anonmeans
Tue Mar 22, 2016 1:46 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: Solving With Exponentials
Replies: 1
Views: 121

Re: Solving With Exponentials

John would like to buy a new car for $10,000. His current car is worth $6,000 and will depreciate to 85% of it's value each year. This doesn't make sense. If its value is $6K and it "will depreciate to 85% of its value", then it will depreciate once to $5.1K. I think they probably meant t...
by anonmeans
Mon Mar 07, 2016 1:59 pm
Forum: Beginning Algebra
Topic: Please review the forum rules before posting.
Replies: 2
Views: 9723

Re: Please review the forum rules before posting.

volatiler475 wrote:...probably later on in the future. I'll be looking for ideas for exam materials and such. Will that be okay?

Probably it's fine but the forum is for helping people with homework so I don't know if there's anybody who can help you write tests.
by anonmeans
Mon Feb 29, 2016 2:13 pm
Forum: Geometry
Topic: Multiplying square roots to find triangle sides
Replies: 1
Views: 510

Re: Multiplying square roots to find triangle sides

If I am multiplying 2 square root of 2 by 2 square root of two,... I'm taking this to mean \left(2\, \sqrt{ 2\,}\right)\, \left(2\, \sqrt{ 2\,}\right) . ...is the expression of that ( A ) 2 times square root of 4 ( B ) 4 times square root of 4 I think it should be "B". I g...
by anonmeans
Sun Feb 07, 2016 9:50 pm
Forum: Trigonometry
Topic: Need help with a problem: sin^2(x+1) = 3sin(cosx-sinx)+3
Replies: 1
Views: 583

Re: Need help with a problem: sin^2(x+1) = 3sin(cosx-sinx)+3

I don't know how to solve it. It's only one equation: sin^2(x+1) = 3sin(cosx-sinx)+3 Are you sure this is right? Because Wolfram Alpha can't do it exactly and if they can't do it exactly, I don't see how you're supposed to do it at all. To see what I mean, copy and paste this into your browser: htt...
by anonmeans
Mon Jan 04, 2016 2:26 pm
Forum: Calculus
Topic: One more question: line tangent to y=2 sin(2 x+(3pi/4)) at x=pi/8
Replies: 4
Views: 772

Re: One more question: line tangent to y=2 sin(2 x+(3pi/4)) at x=pi/8

Wow this is really quick but I have one more question from the book. It's 18 under the AB Diagnostic Test: There are tons of books. Other people can't know which "the book" you're using and probably won't have it either. It's better just to give the whole problem. Thanks. an equation to t...
by anonmeans
Sat Dec 05, 2015 2:30 pm
Forum: Intermediate Algebra
Topic: Math Apps: A square piece of paper ABCD is black on one side, white on the other side
Replies: 2
Views: 736

Re: Math Applications

A square piece of paper ABCD is black on one side and white on the other side and has an area of 3 in^2. Corner A is folded over to point E which lies on the diagonal AC such that the total visible area is half black and half white. So you're starting with this: B*---------*C | / | | / | | / | | / ...
by anonmeans
Sat Sep 05, 2015 3:08 pm
Forum: Beginning Algebra
Topic: Simplified x(10+2x-3x^2) Correctly as 10x+2x^2-3x^3
Replies: 1
Views: 876

Re: Simplified x(10+2x-3x^2) Correctly as 10x+2x^2-3x^3

Hi could you please tell me if I have simplified the following correctly. f(x)=x(10+2x-3x^2) simplified is 10x+2x^2-3x^3. Assuming simplified means expanded out, this is the same thing I get. Also is it possible to simplify this expression: f(x)=7+18x/6x The simplified form (probably "all in o...
by anonmeans
Mon Aug 17, 2015 2:34 pm
Forum: Intermediate Algebra
Topic: Roots of exponential expressions
Replies: 3
Views: 821

Re: Roots of exponential expressions

Sleepy Ash wrote:...what makes a problem like this

\sqrt{b^1^8}=\left| b^9 \right|

End up with an absolute value.

I don't understand how they got that 1^8 = 9?? (b^1)^8 = (b)^8 = b^8, not b^9.

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