## Search found 81 matches

Tue Jun 14, 2016 10:26 pm
Forum: Beginning Algebra
Topic: Liner graphing - Slopes - Problems with change in y being a fraction
Replies: 1
Views: 163

### Re: Liner graphing - Slopes - Problems with change in y being a fraction

m47hh4rd wrote:Clearly I'm doing something wrong because the slope can't have a fraction over a denominator....

Why not? A fraction over a whole is just another number, right? Then you simplify or rearrange if you want a different format:

(2/3)/(2) = (2/3)/(2/1) = (2/3)*(1/2) = etc.
Sun Apr 03, 2016 10:07 pm
Topic: solving for x, given exponentials: 4e^2x + 5e^3x = 15
Replies: 7
Views: 549

### 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.
Tue Mar 22, 2016 1:49 pm
Forum: Statistics
Topic: Simple probability question!
Replies: 2
Views: 316

### 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 ...
Tue Mar 22, 2016 1:46 pm
Topic: Solving With Exponentials
Replies: 1
Views: 262

### 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...
Mon Mar 07, 2016 1:59 pm
Forum: Beginning Algebra
Topic: Please review the forum rules before posting.
Replies: 2
Views: 9934

### 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.
Mon Feb 29, 2016 2:13 pm
Forum: Geometry
Topic: Multiplying square roots to find triangle sides
Replies: 1
Views: 679

### 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...
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: 680

### 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...
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: 972

### 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...
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: 884

### 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 | / | | / | | / | | / ...
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: 979

### 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...