Rom

7 Questions
2456 Answers

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is there any point to answering these anymore?

Does anyone even look at the answers given?

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Rom Mar 3, 2020

+1

1762

9

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latex delimiters

Is there a way of embedding LaTex into posts w/o using the LaTex button and dialogue?

Other boards have $$, [tex][/tex], [math][/math]
read more ..

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Rom Aug 8, 2019

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You know what guarantees I won't look at your problem?

Using the words ASAP, or fast, or now, or anything similar in your title.

You're all quite fortunate to have the group of us here that answer your questions.
read more ..

off-topic

Rom Jan 4, 2019

+2

1303

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sub forums

It might be nice to have a few sub forums so we know better how to address given problems.

For example I suspect we sometimes use calculus to answer questions posted by people in pre-calculus classes.
read more ..

Rom Nov 27, 2018

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1466

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Why do sometimes we get the option to filter out answered questions but sometimes we don't?

Why do sometimes we get the option to filter out answered questions but sometimes we don't?

off-topic

GingerAle ●●●●●●●●

Rom Nov 15, 2018

+26

3062

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I'm concerned that we are just doing people's homework for them. That's no way to encourage people to actually learn the math.

I'm concerned that we are just doing people's homework for them. That's no way to encourage people to actually learn the math.

Thoughts?

CPhill ●●●●●●●●●●●●●●●●●●

Rom Oct 16, 2015

+2

1700

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+6251

help file?

Is there a help file somewhere on how to use the forum tools to get a decent math output display?
Does this board support LaTex?

Rom Jan 30, 2014

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0

Quote:
whats negative 3 over 6 minus 5 over 7 simplified

No. Sophie has it right.

(-3/6) - (5/7) =

-3*7/42 - 5*6/42 = -(21+30)/42 = -51/42 = -17/14

RomFeb 20, 2014

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0

Princess Sophie is correct

x = -17/14

RomFeb 20, 2014

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Quote:
Meadas company makes shocks. The currently guarantee their shocks for 50,000 miles. The distance traveled before the shocks wear out is normally distributed with mean 63,000 and standard deviation 10,000.
What % of shocks will be replaced at no charge to the customer?

We're looking the the number of shocks that wear out before 50000 miles

Shocks wear out according to a Normal(63000,10000) distribution.

First we normalize 50000 according to the distribution.

z = (50000 - 63000) / 10000 = -1.3

Now we look that up in the table or however you usually deal with the CDF of the Normal distribution.

Pr[-1.3] = 0.0968 = 9.68%

RomFeb 20, 2014

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0

Quote:
how would you find x in tan 31=14/x i can solve it when x is on the top but not the bottom

tan(31) = 14/x

x*tan(31) = 14

x = 14 / tan(31)

I think you could have probably managed that if you had thought about it.

RomFeb 20, 2014

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0

Quote:
what is the percentage of 8555 in 372680

first find 8555/372680

then multiply by 100 to convert to a percentage

8555/372680*100

so 2.3%

RomFeb 20, 2014

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0

Quote:
HOW DO I GRAPH THE LINE WHOSE Y-INTERCEPT IS 6 AND WHOSE X-INTERCEPT IS 4?

draw a point on your graph at (0,6) this is the y intercept
draw a point on your graph at (4,0) this is the x intercept

use your trusty straight edge and pencil to connect those two points with a line.

RomFeb 20, 2014

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0

I'm sure the grade and middle schoolers that make up the population of this board will find your treatise most illuminating.

RomFeb 20, 2014

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Quote:
2.22385e6

I don't think that's quite correct Melody.

that e6 means *10 ⁶

so what it really is is

2.22385*10 ⁶

now you can dump into that math thing like

RomFeb 19, 2014

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Quote:
Partial Fraction of 3x^4-5x^3+16x^2-28x+4 over (x-1)^2(x^2+4)

3 - 2/(-1 + x)^2 + 1/(-1 + x) + 4/(4 + x^2)

If you reply that you are interested I can show a more detailed derivation.

RomFeb 19, 2014

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0

Quote:
What is 1,000 to the power of 4?

1000 ⁴ = (10 ³) ⁴ = 10 ^3*4 = 10 ¹² = 1 000 000 000 000 = 1Trillion

RomFeb 19, 2014