All Answers 358514 Answers

0

its 3 repeating

GuestMar 9, 2014

0

Yes P and p can have the same value but only if they are defined that way such as P = p. Otherwise different variables, will have different values.

GuestMar 9, 2014

+5478

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How do you right 79,109km in smallest units?

Do you mean how to write it so the number seems smaller, or how to convert it to a smaller metric unit?

Assuming the second, you would convert 79,109 kilometers to millimeters.
1 km = 1000000mm

So just multiply 79,109 km by 1000000 to find the measurement in mm.

kitty<3Mar 9, 2014

+135

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personunknown:
The mass of a single rhodium atom is 1.71E-22 grams. How many rhodium atoms would there be in 238 milligrams of rhodium?

Hi unknown person!

The number of atoms is the total mass divided by the mass of 1 atom.

238 milligram / 1.71E-22 gram

0.238 gram / 1.71x10 ^-22 gram

(0.238 / 1.71) x 10 ²²

0.139 x 10 ²²

1.39 x 10 ²¹

I like SerenaMar 9, 2014

+118725

0

amo16:
What does tan-1=13/50 equal to ?

Use a calc to work it out. Put the 13 / 50 in brackets.

MelodyMar 9, 2014

+33666

+1

Mft:
What is 1/3 in decimal form

This gives you a clue:

1.0/3

In fact there are an infinite number of threes!

AlanMar 9, 2014

+33666

+1

aying_mathematician:
Find the point of intersection of 5x+y=3 and 5x+2y=1

5x + 2y = 1 ...(1)
5x + y = 3 ...(2)

Subtract (2) from(1) to get

0 + y = -2 i.e. y = -2

Put this into equation (2), say,
5x - 2 = 3
so 5x = 5
so x = 1

The point of intersection is (1, -2)

AlanMar 9, 2014

+33666

+1

valsada:
given that 3 is a root of the equation 2x2 = 5x + k = 0

find the value of k and the second root of the equations

I'll assume this equation is meant to be 2x ² - 5x + k = 0

If x = 3 is one root then 2*3 ² - 5*3 + k = 0 or 18 - 15 + k = 0, or k = -3

This makes the equation 2x ² - 5x - 3 = 0

Since one root is 3 we can write this as (x - 3)*(a*x+b) = 0 where a and b are constants to be found. Expanding brackets: a*x ² + (b - 3a)*x -3b = 0

But by comparing this with the quadratic above we can see that a must be 2 and b must be 1, so we must have (x - 3)*(2x + 1) = 0

The other solution is therefore x = -1/2

AlanMar 9, 2014

+118725

0

MelodyMar 9, 2014

+118725

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girlygirl1994:
I CANT GET TAN TO BE TAN -1.... suggestions?

Press inv or 2nd and then press tan

MelodyMar 9, 2014

+118725

+14

Hi everyone,
Today was a standard slow Saturday/Sunday
There were a couple of great answers from Alan and justdreamer. Thank you for those.
Nothing else to report.
Enjoy the rest of your weekend.
Melody.

MelodyMar 9, 2014

+118725

0

EGarcia:
Why do different calculators give me different values for trigonometric functions?

One calcuator might be set for degrees and the other set for radians.

Sometimes you need to put the angle in brackets.

MelodyMar 9, 2014

+118725

0

DOMINICANGirl_15:
lindsay is opening a yogart shop. she will sell two sizes of waffle cones. the small has a radius of two inches and height of 4 in and will cost $3.50. the large has the same radius but has a height of 6 inches and cost $5.50. which is a better buy?

Hi Dominicangirl_15
I don't think that we get many questions from Dominica.

Little Cone
V = (1/3*pi*2 ²*4) + ( 1/2 * 4/3pi * 2 ³)
V = 5.33pi + 5.33pi
V = 10.66pi
V = 33.49 inches cubed
$3.50/33.49 inches cubed = 10.5 cents/inch cubed

Big Cone
V = (1/3*pi*2 ²*6) + ( 1/2 * 4/3pi * 2 ³)
V = 8pi + 5.33pi
V = 13.33pi
V = 41.88 inches cubed
$5.50/41.88 inches cubed = 13.1 cents/inch cubed

Therefore the little cone is better value. (Unless you are hungary and it is your parent's money)
140309 cones.JPG

MelodyMar 9, 2014

+118725

0

Mara592:
If there is 12 months in one year, then how many years was in 59 months?

12 x 4 = 48

59 divided by 12 = 4 with 11 left over

59 months = 4 whole years and 11 months

which is nearly 5 years.

MelodyMar 9, 2014

0

sin^-1 0.08 could be also read as arcsin 0.08
the answer is 0.080085580034

GuestMar 9, 2014

0

1 2/3 when converted to complex fraction it becomes 5/3.
divide it by 2 or multiply by 1/2 or 0.5
then the result would be 5/6 or 0.8333333333333333

GuestMar 9, 2014

0

cause you're a tightass

GuestMar 9, 2014

Mar 8, 2014

0

GuestMar 8, 2014

+33666

+1

Guest:
A frog starts a special jumping combo 1st jump it covered 32cm... 2nd jump it covered 16cm... 3rd jump it covered 8cm... How many jumps does it need to get to 64 cm?

The frog will need to take an infinite number of jumps! The distances form a geometric series with each jump being 1/2 the previous one, so the distance travelled after n jumps is given by the expression 32*(1-(1/2) ⁿ)/(1-(1/2)). This gets closer and closer to 64 - see below for the distances of the first 20 jumps - but never quite gets there!

frog.PNG

AlanMar 8, 2014

0

Melody say: This is an incredibly rude response. It is not necessary to resort to personal attacks. This is a maths problem not a real plane.
We all make mistakes. It is no big deal. Such respones are not welcome here!
------
Rom say: yep I messed it up.
but you can take your attitude and shove it up your behind.
-----
I understand, Kemosabe . Me “Attitude” (the aircraft axes relative to reference) interpreted wrongly. Try to make funy not make rude. You make boo-boo. Call back please the drop bear. Not real plane only math. Like bad Russian joke with radioactive Kalashnikov you answer. No one say Caesium but number for Caesium was answer. That not right joke because it make children sick. Polonium right answer for joke because it k**l defektor but number wrong. You not know that so I not say anythink.

Message to Kamikaze, Be like boomerang. Turn 180 degrees “relative” to prevent “shove it up your behind” attack. Attack not on you. (Though bad maths k**l citizens). Why delete, instead of fix? (Good. You fix boo-boo).

Kamikaze more rude than joke I say to HomicidalStick. Mine more like snark read on here. Me say as joke to HomicidalStick to change name to SuicidalStick until he learn to fly and do maths, else he only k**l himself because his target he never reach. Maybe he crash plane and also k**l citizens. Why he want “degrees and minutes” and not decimals numbers because airport is aircraft carrier is why. Airport not use this numbers.

I like Americans. This is reason why I know what is Kemosabe. And what is make boo-boo. And what is Fly me to the Moon.
I like Australians. This is reason why I know what is drop bear. And what is boomerang. And what is Tie Me Kangaroo Down Sport
I like you site. Where to learn my English and informations on maths here.

A kоmrаde is here to speak and write good English to help me write the first record. Now he is not here. Take me long time for to write this because of bad English and bad translator site and bad feelings.
Not want to make anger. Now it will be for me to leave you airspace. Now it will be for me to fly to the Blue Moon.

GuestMar 8, 2014

+33666

+1

help:
log(base 3) z = 4 log(base z) 3

AlanMar 8, 2014

+64

0

The truth is that the two mods are equally good! I think we should let the administrator to select which one is better to install for this forum.

Dms

DmsMar 8, 2014

+118725

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Dms:
I just noticed about Mathjax, seems ideal. I hope that Andre can do something about it. Very good job, Melody!

Dms

Hi Dms,
Do we just need Mathjax or do we need the one you spoke of as well?
Thanks,
Melody.

MelodyMar 8, 2014

+64

0

I just noticed about Mathjax, seems ideal. I hope that Andre can do something about it. Very good job, Melody!

Dms

DmsMar 8, 2014

+118725

+14

I have just posted my proposed letter to Andre Massow on the "LaTex editor" thread.
Any comments are welcome. Please comment on the Latex thread. (Please DO NOT comment in this 'end of day wrap' thread)
Thank you.

http://web2.0calc.com/questions/viewtopic.php?f=2&t=9349&p=20611#p20611

MelodyMar 8, 2014

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