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don't you have a claculator, there is one on this site.

MelodyJan 16, 2014

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Guest:
f(t)=t^2+t what is the change in f(t) between t=2 and t=5
what is the average rate of change in f(t) between t=2 and t=5

f(2) = 4+2 =6
f(5) = 25 +5 = 30

so the change in f(t) over this interval is 30-6=24

Now, is this intended as a calculus question?
I am not really sure how I should interpret it but here goes.

the rate of change is given by f ' (t)
f ' (t) = 2t+1

f ' (2) = 5
f ' (5) = 26

so i suppose that the average rate of change is (26-5) / 3 = 7
I'm not really sure if this is what is needed.

MelodyJan 16, 2014

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xPlayinWithFire:
how to find mass when net force and acceleration is given?

Force = mass x acceleration

put the numbers in the correct places and solve for mass.

MelodyJan 16, 2014

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Sydni2000:
What is 6x10 to the fifth power in scientific notation

6 x 10 ⁵ is in scientific notation!

MelodyJan 16, 2014

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itzmetheguy:
can the sine of an angle equal 2?
Why or Why not?

Good question.
Think about it.
sine(theta) = opposite / hypotenuse
the hypotenuse is the longest side of the right angled triangle.
Therefore, opp / hyp must be between 0 and 1. (because the bigger number is on the bottom)

When you learn about angles bigger than 90 degrees, You will find out that the sine can be negative. between -1 and 0
So
the sine of an angle must be between -1 and +1 (inclusive)

I'll show you what y = sine(theta) looks like, the graph shows you that any value of sine(theta) is between -1 and 1
y=sinx.JPG

MelodyJan 16, 2014

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Ashleyyy:
12% of what number is 20?

You say

12/100 * x = 20

then you solve the equation.

MelodyJan 16, 2014

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bijounathaly:
i need help with aligebra

Well you need to aske a question

alright I'll ask you one. You answer and we will go from there.

if you have 2 bananas and 2 oranges and then you are given 1 more banana, What do you have?

MelodyJan 16, 2014

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hollenbeckh:
write an equation of the cosine function with amplitude of 2 and period of 4pi

In this equation

y= acos(n*theta)
the amplitue is a
and
the period is 2pi/n

so maybe you can do your own question now - or at least attemt it.

MelodyJan 16, 2014

#4

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Hi, I_luv_math_3000 and cxz\xc

Thank you for answering rbfish's question. i really like to see people helping.
Please, though could you try to explain how you got the answer. Answers alone don't usually teach anything and that is what we are trying to do here.
There is no point in just doing someone else's homework.

Now, iwilli28, I think that you have offered up a kind of number puzzle.
it needs to be a new post or no-one will see it.
i will post it for you.

MelodyJan 16, 2014

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kjkfgjuljknkj:
how do i find the area of an isosceles triangle if all it gives me is the hypotenuse

Hi kj,
Only right angled triangles have an hypotenuse.
So, is it a right angled isosceles triangle?

If so, let the two equal sides be y
then you have
y ² + y ² = h ²
2y ² = h ²

Anyway, keep going, get a value for y
Then you can find the area

MelodyJan 16, 2014

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58193:
25x + 14

You can't do anything with this, it is as simple as it is ever going to be.

MelodyJan 16, 2014

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"When you multiply it out, you get -45/9, which can be further simplified to -5. "

Hi Kat,
Thank you for answering this question, and doing it so well,
Unfortunately, you have made a little mistake, it isn't -45/9 it is -45/5
could you please fix it. Just mark it in some way to show that it is a correction.
Thanks
Melody

MelodyJan 16, 2014

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If you give us some numbers maybe we can work it out for you.

MelodyJan 15, 2014

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Guest:
how much wood can a woodchuck chuck if a woodchuck could chuck wood

I don't know, but I don't mind people having a bit of fun in the forum.

MelodyJan 15, 2014

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ashutosh ranjan:
cos0

=1

MelodyJan 15, 2014

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monsterbitch:
f(x) = x - 6x^-1 + 9x^-3

differentiate f(x) with respect to x.

f '(x) = 1 + 6x ^-2 - 27x ^-4

MelodyJan 15, 2014

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hjfjlajfjaj:
Use the formula for Sn to find the sum of the first 15 numbers of the geometric sequence
1/9, -1/3, 1, -3

Please show me what you have done to help yourself.
That is, what formula do you think you will use, what are the values of the pronumerals

Try and tell me why you can't do it yourself.

MelodyJan 15, 2014

#5

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Hi An Ocean of Rice,
You didn't cause me any distraction, this is what is so great about the internet, you can end up anywhere!
Even in a young people's maths forum !
I thought that your input was great.
Thank you.

MelodyJan 15, 2014

#3

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i_luv_math_3000:
x=24

He said -8, therefore it would be -24

GuestJan 15, 2014

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soni:
∫▒(27x-8)/(x^2-18x+9)dx

Hi Soni,
1) Are you sure all these numbers are correct?
2) Have you been given any hints or is there more to the question?

MelodyJan 15, 2014

#2

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Explain how you can solve 40x16 by breaking apart the numbers.

GuestJan 15, 2014

#1

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x=24

GuestJan 15, 2014

#1

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When multiplying a fraction by a whole number, remember that whole numbers can be written as a fraction of x/1. This means that 45 can be turned into 45/1. Thus your mutiplication problem can be written as [45/1 * -1/5]. Now multiply the numerators together and the denominators. (Remember your signs.)

When you multiply it out, you get -45/9, which can be further simplified to -5.

Alternatively, in situations such as this, you can thnk of this as a division problem. My teacher always referred to this as "copy change flip," meaning you take the inverse of the fraction (turn -1/5 into -5) and change the sign to division. In other words, [45 * -1/5] is turned into [45 / -5].

GuestJan 15, 2014

#4

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by jnjnxdsd » Tue Jan 14, 2014 12:47 pm
The annual production of rice is 32,000,000,000,000 Kg

by Melody
Tue Jan 14, 2014 11:40 pm
Are you talking about the annual world production of rice which is an number that was given in the question?
What should that number have been?

The student gave an incorrect value for the annual production of rice 32,000,000,000,000 Kg (32,000,000,000 Metric tons).

About 670 Million Metric Tons of rice are grown annually (2010) sagevfoods.com/MainPages/Rice101/Production.htm?

Your math is correct but the data is wrong.

670,000,000,000 Kg Rice / year. 47.8 times less than posted. So it would take 2,4616,405 years to grow (a mole of rice grains) -- an ocean of rice.

Not sure where the 10.8 years came from. It might be all the sake (rice wine) we were sampling. That is what led to a googling for rice and to your form. We hope it did not cause a distraction.

GuestJan 15, 2014

#2

+3

You forgot the squared. if you meant 24 x^2 y / 40 x y ^2 it would be 24/40 * x^2/x * y/y^2 = 3/5 * x* 1/y = 3x / 5y.
If you meant 24 x^2 y / 40 (xy)^2 then you would get 24/40 *x^2/x^2 * y/y^2 = 3/5y

GuestJan 15, 2014

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