## Tim 5 years ago Ask your question to me -- I'm a math expert :)

1. anonymous

Wow!nice to have such a math expert :) Erm, I wanna ask something about the formula for curvature. I know that it is dT/ds but how does it become llT'(t)ll/llr'(t)ll and llr'(t)xr'(t)ll'llr'(t)ll^3 ? can you explain how it is derived? ^^Thank you!

2. anonymous

hi you ask this where it says ask a question on the left side so more people will see it :)

3. anonymous

oh,okay,haha:) I 'm really new to this kind of group study. Thanks for the advice^^

4. anonymous

You're welcome :-) I see Tim posted it for you :-)

5. anonymous

Tim could you answer one of my math problems i posed?

6. anonymous

thats awesome..did you see my question? is there a way u can explain it to me? ( as if Im learning it for the first time)

7. anonymous

Find the volume for the regular pyramid.

8. anonymous
9. anonymous

give a graph of the function and identify the locations of all critical points 7$\sqrt[7]{x-5}$

10. anonymous

The sum of all the terms of a finite arithmetic progression is 75. If the common difference is 2 and the third term is 17, how many terms are there?

11. anonymous

write a mixed number that is greater than 12/4 and less than 15/4?

12. anonymous

There are 10 boys and 8 girls on the cross-country team. The ratio of boys to girls participating in track and field is proportional to the ratio of boys to girls on the cross-country team. Which could be the number of boys and girls participating in track and field?]

13. anonymous

the costs of two sound systems were decreased by $10. the original costs of the systems were$90 and \$60. without calculating, which had a greater percent decrease? explain