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Your question is very vague.
If you have a cost per gram and want to find cost per kilogram, use multiplication to convert:

cost per gram = C

C dollars 1000 g
________ * ______ = 1000C dollars/kg
g 1 kg

GuestNov 24, 2013

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You will move the length of the circumference of the wheel

C = 2*pi*r

You can do the rest.

MelodyNov 24, 2013

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4x 5 + 3 2 = 2x

You may be right Nod but maybe Danielle meant

4x^5 + 3^2 = 2x (The carrot means to the power of )

4x^5 - 2x +9 = 0

Maybe you were right Nod, mine isn't very freindly.

MelodyNov 24, 2013

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simplify f^3+f^2+17+8f^2-7f-2

= f^3 + f^2 + 8f^2 - 7f +17 -2

= f^3 + 9f^2 - 7f +15

just the same as Nod told you. But this is where you need to stop.

Simplify in this context means take out any brackets and collect like terms.
definitely do not put any brackets in when you simplify something like this.
If the aim of the question was to put brackets in, you would have been asked to factorise. (spelt with a z in USA I believe)

MelodyNov 24, 2013

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Why is 0.2 times 0.3 0.06?

You need to draw the pictures that I describe in order to understand what i am saying.

When you are multiplying numbers less than 1 you are best to think of the times sign as 'of'
for instance

1/2 * 1/2 = 1/2 of 1/2
And , if you have a half a cake and you eat half of it, then you will be eating 1/4 of the original cake. Draw a picture to see what I mean
1/2 *1/2 = 1/4
since 1/2=0.5 and 1/4=0.25 it follows that
0.5 * 0.5 = 0.25
I think for most people it is easier to think in fractions though.
--------------------------------------------------------
draw a long rectangular cake and break it into 10 pieces. each of those pieces is 1 tenth of the cake.
Now, you will need to split or imagine each of those 10 pieces split into 10 pieces to make a total of 10*10=100 pieces. Each tiny piece will be 1 hundreth of the cake.
Very lightly shade 3 tenths (0.3) of the cake. that's how much cake you started with. The rest is already gone. You have also shaded 30 hundredths (0.30) of the cake because 3/10=30/100

Yours question is 0.2 times 0.3 (0.2 of 0.3)
0.2 is 2/10 so you want

2/10 of the 30 tiny pieces of a cake that you have
1 tenth of 30 is 3
so 2/10 of 30 is 6
so the answer is 6 pieces of cake
but each piece is 1 hundreth of the original cake
so the answer must be 6 hundredths of the original cake
6 hundredths = 0.06

I hope that helps.

MelodyNov 24, 2013

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88=(5.5)/(1+p)^30

It should first be noted that p cannot be equal to -1

88(1+p)^30 = 5.5

(1+p)^30 = (5.5/88)

noe take both sides to the power of 1/30 and you can finish it.

MelodyNov 24, 2013

Nov 23, 2013

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If you mean what you have shown then..

4 x 5 + 32 = 2x

20 + 32 = 2x

52 = 2x

26 = x

GuestNov 23, 2013

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Gather up like terms...

f^3 + 9f^2 -7f + 15

take f out as a factor in the first 3 terms

f (f^2 + 9f - 7) + 15

I don't think you can easily factorise the stuff in the () so this may be as far as it goes...

GuestNov 23, 2013

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This expression needs to equal something (ie. you have only shown half the equation). Then the question probably say 'differentiate with respect to...'. This is the other piece of info needed. Without these two pieces of info, then it is anybody's guess....

GuestNov 23, 2013

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Or another way...

Convert the decimal fractions into whole numbers by multiply both by 10.

ie.

0.2 x 10 = 2

and

0.3 x 10 = 3

Now multiply together

2 x 3 = 6.

However, we have to remember that we multiplied both numbers by 10 (ie. 10 x 10 = 100) so we must remember to divide the answer by 100

...0.06

GuestNov 23, 2013

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Divide both sides with what is in the brackets

d/(Vf-Vi/2) = t

GuestNov 23, 2013

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you can write 0.2 as 1/5 and 0.3 as 3/10
and when you multiply 1/5 with 3/10 you get 3/50 ( multiply the numbers above and multiply the number below)
3/50=0.06

GuestNov 23, 2013

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GuestNov 23, 2013

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Calculate the acceleration of a biker travelling around a circular path of 36.9 meter radius at 19.9 m/s

The acceleration is into the centre of the motion and

a = v^2 /r

a = 19.9^2 / 36.9

a = 10.7 m/s ²

I think that's right but I am pretty new to this stuf too.

http://www.youtube.com/watch?v=YRBRarbMCyE
This you tube showed a proof - I thought it was interesting but if you don't follow it or don't want to know about it, it won't matter
you just need to remember the formula.

MelodyNov 23, 2013

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102 is what percent of 637.5

102/637.5 * 100%

MelodyNov 23, 2013

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Nod's answers are right but I thought you might like a reason.

20% off - divide by 5 because 20/100=1/5 you are actually multiplying by 1/5 which is the same as dividing by 5
33% off - divide by 3 because 33/100 =1/3 approx you are actually multiplying by 1/3 which is the same as dividing by 3
25% off - divide by 4 etc
10% off - divide by 10

These give the discounts, which is what you are asked for but if you needed the new price you would have to subtract the discount off the original price.

MelodyNov 23, 2013

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What is the ratio of csc(3pi/4)

This is the 2nd quadrant so sin and therefore cosec is positive

= csc(3pi/4) = 1/sin(3pi/4) = 1 divided by +sin(pi/4) = 1 divided by (1/sqrt2) = 1*sqrt2/1 = sqrt2

MelodyNov 23, 2013

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(x-2)! = 210*(x-1)! .
what is the value of x?

(x-2)! / (x-1)! .=210

x-2 = 210

x = 212

MelodyNov 23, 2013

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how can u divide 1 by 2.54, with showing your work?

For starters, you can't divide by a decimal unless you are a calculator.
think of it as a fraction 1/2.54
and multiply by 100/100 (to make the bottom a whole number)
so it becomes

100 divided by 254
As a fraction it is easy.
100/254 = 50/127

As a decimal you need to do it by long division and it is a bit hard to show you that in this forum
I found a good you tube clip that will show you how it is done,

http://www.youtube.com/watch?v=Gn2pdkvdbGQ

MelodyNov 23, 2013

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Thanks for your appreciation
I am glad that I helped.

MelodyNov 23, 2013

Nov 22, 2013

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visit; http://zebu.uoregon.edu/~probs/mech/circ/Centrip2/node2.html

GuestNov 22, 2013

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GuestNov 22, 2013

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If you can imagine looking straight ahead (neither up nor down) then this is zero elevation or depression. If you look up at an object (perhaps a star) the straight line from your eyes to the star is the line of elevation (going up). If you were to look down (at a stone) then the straight line from your eyes to the stone would be the line of depression (going down).

GuestNov 22, 2013

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20% off - divide by 5
33% off - divide by 3
25% off - divide by 4
10% off - divide by 10

GuestNov 22, 2013

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Convert the 'three and two thirds' into thirds (top heavy fraction)

3 2/3 = 11/3

Now when you divide by a number (any number) it is the same as multiplying by its reciprocal

The reciprocal of 11/3 is 3/11 (just turn the number upside down)

So now we can answer the question:

11/12 x 3/11 = 3/12 = 1/4

GuestNov 22, 2013

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