Member: Rom

7 Questions
2456 Answers

1225

+6251

is there any point to answering these anymore?

Does anyone even look at the answers given?

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Rom Mar 3, 2020

1762

+6251

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

1806

+6251

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

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Rom Jan 4, 2019

1303

+6251

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

1466

+6251

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

+6251

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

1700

+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?

Melody ●

Rom Jan 30, 2014

+6251

Quote:
sin2(x) = ½, what is cos2(x)

cos ²(x) + sin ²(x) = 1 for any x

so

cos ²(x) = 1 - sin ²(x) = 1 - 1/2 = 1/2

RomFeb 19, 2014

+6251

either click 2 and the trig function you want the inverse of

or left click on the trig function button and hold until it switches to inverse and release

RomFeb 19, 2014

+6251

Quote:
If one side of a hexagon is 5xy+10z , what is the perimeter?

in general having the length of 1 side of a hexagon tells you nothing about the perimeter

if you mean a regular hexagon, where all the sides are the same length, then the perimeter is just 6 times the length of a side.

RomFeb 19, 2014

+6251

Quote:
How do you write 263.61% as a decimal

just divide it by 100

263.61% = 2.6361

RomFeb 19, 2014

+6251

Quote:
what is the ph of a 8.5810^-4 M solution of HBr?

chem isn't my strong subject but since HBr is very soluble in water I guess you assume that you have its molar mass in hydrogen ions

and so the pH is

pH = -log(8.58*10 ^-4) =

-log(8.58*10^(-4))=

RomFeb 19, 2014

+6251

Quote:
1/2(1.5*10^(5))*(18)^2

1.5*10 ⁵ = 150000

1/2*150000 = 75000

18 ² = 324

324 * 75000 = 24300000 = 2.43 * 10 ⁷

so you are correct. The book isn't always right. Usually but not always.

RomFeb 19, 2014

+6251

I just want the board to be faster.

RomFeb 19, 2014

+6251

I don't know if you understand English or not. I'm afraid I don't speak Russian.

The translation of your question is "what is a module number"?

What I think you're asking is what does (mod N) mean.

If I have some number X mod N this refers to the remainder resulting from X/N

for example if N=10

12 mod 10 = 2

because 12 = 2*10 + 2

similarly

2343243256243262343243 mod 10 is 3

so if K = X mod N

X = m*N + K where m is a (usually positive) integer

RomFeb 19, 2014

+6251

not real sure what you are asking.

If you've got a right triangle with legs a and b, and hypotenuse c,

and you know say a and c,

you can find b as

b = sqrt(c ² - a ²)

is that what you mean?

RomFeb 18, 2014

+6251

Quote:
log4(1/4)

*cough*

1/4 = 4 ^(-1)

so log ₄(1/4) = -1

RomFeb 18, 2014

Username	Rom
Score	6251
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