All Answers

ann:
Consider the function
f(x) = 4x + 1.
(a) Estimate the area between the graph of f and the x-axis between x = 0 and x = 3 using six rectangles and right endpoints. (Round your answer to two decimal places.)

These are the areas that you are expected to find.

140210 estimating area.JPG

MelodyFeb 10, 2014

+118728

Rom:
all rational numbers that don't have a finite decimal representation are repeating.

VERY GOOD POINT ROM. I actually didn't think of that, thanks.

BUT, how did you know that it didn't have a finite decimal representation.? (How did you know that the numbers didn't come to an end)
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For people who don't speak 'math'

Rom said that if you can write a number as a fraction then it has to be a rational number.
AND
All rational numbers can be written either as a terminating (ending) decimal or as a recurring (repeating) decimal.

MelodyFeb 10, 2014

+118728

MAG2124427:
how do I solve the equation, (5x-8)(4x+3)=0

Hi MAG2124427,

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Think about this different equation
a * b = 0
What are the possible answers ?
You are multiplying 2 things and the answer is 0.
This will only happen if a or b or both are equal to 0.
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The same is true for you equation.
If (5x-8) * (4x+3) = 0 then either

5x-8 = 0 OR 4x+3=0
5x = 8 4x = -3

x = 8/5 = 1 and 3/5 or x = -3/4

MelodyFeb 10, 2014

+6252

all rational numbers that don't have a finite decimal representation are repeating.

RomFeb 10, 2014

+118728

larakas0745:
what is inverse sine=1.1746?

The sine of an angle must ALWAYS be between -1 and +1

∴ Hampy canper is absolutely correct.

MelodyFeb 10, 2014

+118728

jse:
9 to the x power =27

9 ^x = 27

(3 ²) ^x = 3 ³

3 ^2x = 3 ³

∴ 2x = 3

etc

MelodyFeb 10, 2014

+118728

I am not sure what you mean either, but,

If you are looking for a side length you would use sin

If you are trying to find an angle then you use sin ^-1

MelodyFeb 10, 2014

+1313

To op: ie. ORIGINAL POSTER. Try to define your question with words and what you are trying to resolve through asking it. Nobody can read your mind, even if the question in and of itself seems to be explanatory. This is the basics to get the best help possible from the volunteers here.

If you're playing games on the other hand, or making some kind or remarks to your self because you though it wouldn't be answered, or that it's fun to see how one would respond to a brief and common case in maths, then it's been achieved and one would hope in the future you consider maths and the time of those dedicating themselves to the site worth more.

Atm, the forum is knew and establishing. Therefore, if you have serious questions (they'l always be answered which is the goal of the site.)
Try putting the sum/problem with words so the helpers can get an idea.

StuFeb 10, 2014

2+2

I assume you do not know how to do basic math, otherwise what are you doing posing a math question you already know the answer to? Anyway, to get to the answer take the two numbers, 2 and 2 and add them together and when you do that you get 4. The answer is 4. Hope this answers your question.

GuestFeb 10, 2014

+118728

mariawave:
the polaroid ultrasonic rangefinder on a camera sends out a pulse with period 5x10^-7s and wavelengh of 1.5x10^-4m the sound bounces off a unicorn and returns to the camera 0.6s later