All Answers

+118725

larakas0745:
what is inverse sine=1.1746?

On your calc press

2nd or shift
sin
1.1746
=

And behold, your answer will appear. Just like magic.

MelodyFeb 10, 2014

+118725

Keepitculp:
What is sin A = 0.85

You have the sin ratio, you need the angle so you can make A the subject by saying

A = Sin ^-10.85 (A is the inverse sin of 0.85)
or A = asin 0.85 (A is the arc sin of 0.85)
Arc sin and inverse are exactly the same thing.

To get this answer first make sure that your calculator is is set to degrees. There will probably be a little D at the top of the display area.
then press
2nd sin 0.85 =

MelodyFeb 10, 2014

please clarify the question more, because the sine of that number doesnt exist

GuestFeb 10, 2014

(5x-8)(4x+3)=0
20x^2+15x-32x-24=0
20x^2-17x-24=0

then substitute until u get it to equal 0

GuestFeb 10, 2014

x=3

GuestFeb 10, 2014

End behavior is where a function goes at each of it's ends.

GuestFeb 10, 2014

Feb 9, 2014

+6252

Clipboard01.jpg

from the picture it should be clear that

tan(theta) = 74/70

theta = tan ^-1(74/70) = 49.6 degrees

RomFeb 9, 2014

+6252

Quote:
9x^2 + x^2 = 576

9x ² + x ² = 576; add the x ² terms together

10x ² = 576; divide both sides by 10

x ² = 576/10; take the square root of both sides

x = +/- sqrt(576/10); compute the square roots

x = +/- 24/sqrt(10); multiply top and bottom by sqrt(10) to get it proper form

x = +/- 24sqrt(10)/10; depending on what your teacher likes to see you can either leave it like this or do the division by 10 to obtain

x = +/- 2.4sqrt(10)

RomFeb 9, 2014

+6252

I assume you mean on the calculator here.

Selecting sin should be pretty obvious, just click the sin button.

To get sin ^-1 you can either

1) click 2nd then click sin

2) click and hold sin until it changes to sin ^-1 then release

RomFeb 9, 2014

+118725

Josh:
Log(3x)+4log(5y)-3log(4z) into single log please.

Here are the log identities - you try to work it out yourself. Post again after you have given it your best shot.

http://en.wikipedia.org/wiki/List_of_logarithmic_identities

http://www.mathsisfun.com/algebra/exponents-logarithms.html

MelodyFeb 9, 2014

+118725

vicky:
2.5 km. how many metres is that ?

Multiply by 1000

MelodyFeb 9, 2014

+118725

vicky:
2.5 km. how many metres is that ?

multiply it by 1000

MelodyFeb 9, 2014

+118725

ashwin_7:
cube root of 72.9

A cube root is a power of 1/3 so
The power of symbol is ^ or x ^y

just press

72.9 ^ (1/3) =

MelodyFeb 9, 2014

+118725

Jessica:
:shock: hi

Halo kepada anda.
Anda boleh beritahu saya apa Bahasa aku menulis ini?

MelodyFeb 9, 2014

#33

+118725

+14

Good evening everyone,
Another very quiet day today.
However, great answers were forthcoming from Rom, DavidQD, gibsonj338 and guest. Thank you.
I used the character map that 'I like Serena' told me about today. It was really good. Thanks ILS

A lot of people, including myself, originally think that the message system doesn't work.
This is because messages seem to 'get stuck' in the outbox.
The system does work, the messages will stay in your outbox until the recipient opens it. The message will then move to 'sent messages'.
While the message is in the outbox, you can edit it and you can delete it.
If you delete a message that was already in the outbox then the recipient will still receive a message. The message will tell them that you had sent mail but that you had already deleted it.

If you choose to, you can be notified of new private messages.
To do this go to the User Control Panel and choose the Board Preferences tab. Then select "notify me of new private message".

Enjoy the rest of your weekend,
Melody.

MelodyFeb 9, 2014

#85

+118725

bump

MelodyFeb 9, 2014

+118725

bump

MelodyFeb 9, 2014

+118725

Guest:
a2=b2+c2-2(bc)cosA

This is cosine rule. It is probably better written like

a ²=b ²+c ²- (2bcCosA)

That way you are less likely to make a mistake when you work out your answer.

MelodyFeb 9, 2014

+118725

Guest:
no, a2= c2-b2

a ²=c ²-c ²
Hi Guest,
You are right,
This could easily have been Pythagoras Theorem
And often with Pythagoras the hypotenuse is called c
In which case your answer is completely correct.
BUT
The hypotenuse does not have to be called c.
It can be called anything.
This is important for you to understand and remember.

By the way, I used the 'sup' button above the smilies to get the indices where they belong. 'sup' stands for superscript.

MelodyFeb 9, 2014

+118725

lolkbye:
3.00x10^8/(7.91x10^10)

Great answer gibsonj338

I'd do it like this

3/7.91 * 10 ⁸ * 10 ^-10

0.379267 * 10 ^-2

3.79267 * 10 ^-1 * 10 ^1-2

3.79267 * 10 ^-3
or
0.00379267 ( correct to 6 significant figures)

Which is exactly the same answer as gibsonj338 got.

MelodyFeb 9, 2014

+118725

Help:
How do you simplify cot(sec^1x)?

I think that this is what you meant.
simplify cot(sec ^-1x)

Draw a right angled triangle.
put theta in one of the acute angles.
Now let
Θ = sec ^-1x
this means that
sec Θ = x/1 = 1/ cos Θ
∴ cos Θ = 1 / x
So put 1 on the adjacent side and x on the hypotenuse
Use Pythagoras Theorem to find the third side.
Now read cot Θ straight off your triangle.

MelodyFeb 9, 2014

+118725

gracielou34:
how many tiles 6"x24"t0 tile a 10'x10 room

Well, to tile along the floor we will use the 6" ones
Two 6 inch ones will make a foot. You want to tile 10'. so that must be 2*10 tiles. = 20 tiles along the floor

Now going up the wall. Each tile is 24" which is 2'
2' for one tile means 10/2 = 5 tiles to the ceiling.

So you have 20 across the wall and 5 up the wall. How many will that be? Use some paper and draw it if you need to.

MelodyFeb 9, 2014

+118725

Guest:
when you are doing pythagorean theorem c^2 is the smallest number or the biggest number?

Hi guest
Have a look here.
copy and paste it into your browser.

http://www.mathsisfun.com/pythagoras.html

MelodyFeb 9, 2014

+118725

helpneeded105:
3x+2z=1
2y-z=1
x+2y=1

I am very confused!!! Help please!

Hi Helpneeded105,

I am sure that this would be best done using matrices but I am not very comfortable with those so I will do it with normal substitution techniques.

x=1-2y from the third one
2y-1=z from the 2nd one
Substitute these values of x and z into the first one to get

3(1-2y) + 2(2y-1)=1
solve this for y
Sub in this y value into the other 2 equations to solve for x and z.

MelodyFeb 9, 2014

Feb 8, 2014

no, a2= c2-b2

GuestFeb 8, 2014

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