7th GRADE MATH

[Nick_Spanich]

Ok for my homework tonight we had to do problems like these:

 

I=?,P=12,000,R=7%,T=2years I=Intrest P=Principal R=rate T=Time

 

I=83.00,P=6000,R=?,T=3years

 

I got how to do those(IChose random numbers)

 

But I need help trying to get

 

I=125,P=?,R=6%,T=6years

 

How do I get the principal? We never learned it in class

[the tree]

Say you were using something along the lines of [math]I=(P-1)\times(1+R)^{T}[/math] to calculate the net interest, would you be able to re-arrange that to make [math]P[/math] the subject?

[Nick_Spanich]

Say you were using something along the lines of [math]I=(P-1)\times(1+R)^{T}[/math] to calculate the net interest, would you be able to re-arrange that to make [math]P[/math] the subject?

 

Fist off thanks for actually helping.

 

An I think you got what I must do wrong.

 

I got to get The principal.

 

And how do you get all the symbols

 

Ok for my homework tonight we had to do problems like these:

 

I=?,P=12,000,R=7%,T=2years I=Intrest P=Principal R=rate T=Time

 

For this one I multiplied [Math]P * r * T[/math]

 

[Math]I=83.00,P=6000,R=?,T=3years[/math]

 

this one I did [math]P x T / I[/math]

 

What do I do for this

 

I=400,P=?,R=7%,t=5

 

I have to find the principal

[the tree]

If you can work out the interest given the principle, then you should be able to reverse the process (which is akin to rearranging the equation) to work out the principle given the interest.

 

For mathematical typesetting read the quick Latex tutorial.

[Nick_Spanich]

So I would Multiply [math]I * r / T[/math]

 

I am not sure exactly what to do buy reversing the equation.

[the tree]

No, how are you working out the original example?

[Nick_Spanich]

No, how are you working out the original example?

 

 

For the first ones we found the intrest and the rate.

 

Now I must find the principal. I don't know how.

 

For finding the intrest I just did [math]P * r * t[/math] and got the answer

[the tree]

For finding the intrest I just did [math]P * r * t[/math] and got the answer

Are you sure about that? Given a realistic input, does that give a realistic output? (edit, actually I guess it kind of would sometimes if you don't understand interest rates, kind of).