All Answers 358514 Answers

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lol231231332:
i get 500 points a day and i need 130,000 points. How much time its gonna take for me to get 130,000?

130000 / 500 days

MelodyJan 21, 2014

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Guest:
what is negative 5 (1/3) divided by 1.5

first, 1.5 = 3/2
do you mean

-5 * 1/3 divided by 1.5
= -5/3 divided by 3/2
= -5/3 * 2/3
= -10/9
= - 1and 1/9
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or do you mean

[5 and 1/3 ] divided by 1.5 [note: 5 and 1/3 = 15/3 + 1/3 = 16/3]
= 16/3 divided by 3/2
= 16/3 * 2/3
= 32/9
=3 and 5/9

MelodyJan 21, 2014

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nsambarr:
x+3/2=15

You just need to get rid of 3/2 from the LHSide.

You do this by taking it away.

x+3/2-3/2 = 15 - 3/2

Now 3/2 ia 1 and a half (or 1.5) Just as our guest told you. so

x = 15 - one and a half
x = 14 - a half
x = 13 and 1/2 (or 13.5)

MelodyJan 21, 2014

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8 - 3[-2(2 - 5) - 4(8 - 6)]
8 - 3[-2(-3)-4(2)]
8-3[6-8]
8-3(-2)
8--6
8+6
14

GuestJan 21, 2014

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LilyMariexxoo:
If the temperature outside is 50°F, what is it in degrees Celsius?
Equation: C = 5/9(F-32)

Yes,
Just REPLACE the F with 50
that is

C = 5/9(50-32)

then work it out.

MelodyJan 21, 2014

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vv331pie:
:?: how can i make dividing decimals easier? its really hard for me!

You could try working through this web page

http://www.mathsisfun.com/dividing-decimals.html

MelodyJan 21, 2014

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Terry:
calculate 10 factorial

Walt gave you a good answer.

there is also a factorial button on your calculator.

It looks like ! you will probably need to press 'shift' or '2nd' to bring it up.

on my calc if i want 5! i press

'shift' x! 5 =
and the answer is 120

MelodyJan 21, 2014

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svkirtane:
Can I use this calculator for sine regression ?- Subhash Kirtane -Adj Faculty Math SLCC,Salt Lake City,UT

I don't think that anyone who actually uses this forum would know.
Maybe if you go through the contact email at the top of the page you might have more luck.
sorry.

MelodyJan 21, 2014

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IDK:
simplify the given expression.
14x(4xy^14)(-4x^-10y7)

I got a different answer from you Walt. (plus, it is easier to read if you use the superscript button (sup) when you do indice questions )

14x(4xy^14)(-4x^-10y7)

= 14 * 4 * -4 * x * x * x ^-10 * y ¹⁴ * y ⁷

= -224 x ^-8 y ²¹

= -224 y ²¹ / x ⁸

I haven't looked at your answer properly, maybe mine is the one that is wrong.

MelodyJan 21, 2014

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masoud:
how can i enter angle 20 deg ,30 min

Hi Masoud and Special,

That was a good lesson that you just gave Masoud and it is stuff he needs to know but entering an angle into the calc can be much easier than that.

Make sure your calc is in degrees mode - there will be a little D at the toop of the screen.

now just press
20, degrees button, 30, degrees button (if you want to enter 25 seconds, then you press 25 degrees button again)

calculator degrees minutes and seconds.JPG

MelodyJan 21, 2014

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X+3/2=15 = X+1.5
X=15-1.5=13.5
X=13.5

OR

(X+3)/2=15
=(x/2)+1.5=
X=2*(15-1.5)=2*13.5=27
X=27

GuestJan 21, 2014

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*
Hi tannawirsch,

1. An unknown artist painting was worth $85 in 1978. As the artist grew in popularity, the value of this painting grew in value at the rate of 9% per year.
A) Write an equation to represent the value (y) in dollars of the painting as a function of the number of years (c) since 1978?

y=85(1+0.09) ^c

Now you think about why this is so. What will it be worth after 1 year, after 2 years, what is the pattern.

2. Caffeine found in pop, coffee, and tea; travels in your bloodstream after you consume it. After you drink a beverage that contains caffeine, 13% of the caffeine in your bloodstream is removed every hour. *Initially 100% is present, so A=100.
A) Write an equation to represent the percent of the caffeine (y) that remains in your bloodstream (x) hours after you drink it?

y=(1-0.13) ^x

MelodyJan 21, 2014

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jake ensign:
My question says, "write a quadratic equation that has root -7 and 6 ? "

That's easy
y=(x+7)(x-6)
or
y=13(x+7)(x-6)
or
y= -12(x+7)(x-6)

Do you get the common theme here.

MelodyJan 21, 2014

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Aaa21:
What's 900/1250 in simplest form?

Have a look at this explanation web page. There is even a spot at the bottom where you can put your own fraction in and get an answer.

Just copy and paste the address into your address bar and then press return.

http://www.mathsisfun.com/simplifying-fractions.html

MelodyJan 21, 2014

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ajade:
how do i convert decimals to fractions?

hi ajade,

That's no good. We can't have that.

Try working throught this web page. It shows you how to do it then it gives you some questions to do.

Just copy the address and paste it into your address bar at the top of the page, then press enter

http://www.mathsisfun.com/converting-decimals-fractions.html

I hope that it helps you feel like this

MelodyJan 21, 2014

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Amess:
4x^3+12x^2-26x-24=0
approximate any solutions to two decimal places.

I read your question wrong. I thought you had to estimate all of them and i thought that was a bit over the top.
Anyway you will need to use newton's method of approximating roots.
Show me what you can do and we'll take it from there (I haven't actually tried to do it yet)
I did a graph for you so you will at least know what you are trying to find.

140121 cubic.JPG

MelodyJan 21, 2014

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Nobody Special:
Wow, this is my third post today... I am truly pathetic

My problem is:

If 10^a = 500 , then in terms of a, log(5) = ?

Please don't give me the answer. I've been having trouble with problems like these, so if whoever answers can show me how to get the answer, that would be awesome!

Thanks, and sorry for hogging the forum.

Hi Special,
You are not hogging the forum. You are just using it well. Besides, there seems to be lots of people answering today which is really great. (and everyone needs questions to answer)
now for your question.
10 ^a = 500

10 ^a = 5 x 100

10 ^a = 5 x 10 ²

10 ^a / 10 ² = 5

10 ^(a-2) = 5

log 10 ^(a-2) =log 5

log 5 = log 10 ^(a-2)

log 5 = (a-2) log 10

log 5 = (a-2) x 1 (assuming that the base is 10)

log 5 = a-2

If there is anything you don't understand, just ask. (as many times as you want)

MelodyJan 21, 2014

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john:
8 - 3[-2(2 - 5) - 4(8 - 6)]

Why is this causing you a problem John?

You just do what is in the inside brackets first and work out from there.
When there is nothing between a number and a bracket, there is really an invisable multiply sign that you will need to put in. Is that what your problems was?
so the first line is
= 8 - 3 x [-2 x -3 - 4 x 2]

now, multiply is more important than subtract. I mean, you multiply before you subtract.
And, when you multiply pos and neg numbers just remember that if the signs are the same, the answer is postitive and if the signs are different the answer is negative.
So the next line will be
=8 - 3 x [6-8]

You see if you can finish it.

MelodyJan 21, 2014

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Guest:
What is the perimeter of an isoscolese trapezoid called T R A P if P T is 27.5m and T R is 58.8m and the length of the bisector of segment R A and segment T P is 47.6?

I had to make assumptions about which sides you were referring to but my diagram illustrates my assumptions. It might be different from what you intended.

This is what I think.

PA / 47.6 = 47.6 / 58.8

PA = 47.6 ² / 58.8

PA = 38.53 repeater = approx 38.53m

Therefore the perimeter is 58.7m + 27.5m + 38.53m + 27.5m

If you need to justify any of this it will require more work.

140121 isosceles trapezium.JPG

MelodyJan 21, 2014

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Excellent work Walt.

I did think of this answer yesterday but I had a little nagging doubt in my brain. I don't think that doubt was justified.
I believe your answer is completely correct.

I'll tell you what I was thinking.
Why does the smallest common factor of 2 whole numbers have to be a whole number?
I think it does, I can't think of any example where it is not, but, this question just got me thinking about it.

MelodyJan 21, 2014

+56

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Hi cassie

Sin(11)=500/h

Sin(11)/500=1/h

h=500/sin(11)

When I did this on the calculator I got 2620 feet. Hope this helps.

WaltJan 21, 2014

+56

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Volume is (b*h)/3
b=pi*3.6^2
h=3.6

Solve for b then multiply it by h and divide all of it by 3 and you get your answer.

WaltJan 21, 2014

+56

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Well if you have the formula just plug in 50 for the F and solve.

WaltJan 21, 2014

Jan 20, 2014

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krisobot8:
4% van 1000

Hi krisobot8,

For the benefit of others, i will spell out that this question is in Dutch, it is just 4% of 1000

4% = 4/100 = 0.04

of is multiply

4% of 1000 = 0.04 x 1000 = 40
---------------------------------------------------------------------------------------

Hallo krisobot8,

Ten behoeve van anderen, zal ik spellen uit dat deze vraag is in het Nederlands, het is slechts 4% van 1000

4% = 4/100 = 0,04

voor vermenigvuldigen is

4% van 1000 = 0,04 x 1000 = 40

--------------------------------------------------------------------------------------------

MelodyJan 20, 2014

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anon:
what do I press to get tangent inverse 1 in the scientific calculator?

It will probably help if you know that inverse tan (tan ^-1 ) is the same thing as arctan (atan)

Just press 2nd atan 1 =

There is a toggle button at the bottom to set for degrees or radians.

It's not relevant for your problem but I don't know if this calculator will convert decimal degrees into degrees, minutes and seconds. I can't see a button for it.

MelodyJan 20, 2014

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