## anonymous 5 years ago find the value of x

1. anonymous

2. anonymous

its the same as the other one silly, just with different numbers!

3. anonymous

so x is 3?

4. anonymous

no, not the same answer, same method.

5. anonymous

1/3 (pi r^2)(13)=215 solve for r

6. anonymous

$215=\pi \times x ^{2}\times 13$

7. anonymous

yes, but after simplifing actually sub in the value of pi as a number and solve it down to a real number

8. anonymous

3.14*13=40.82/3=13.61

9. anonymous

where did you put the x squared?

10. anonymous

13.61(x^2)=215

11. anonymous

good, keep going

12. anonymous

15.8

13. anonymous

15.8=x^2, yup, almost there

14. anonymous

7.9

15. anonymous

how did you get that?!

16. anonymous

15.8/2

17. anonymous

ops.. 3.97

18. anonymous

no thats x to the 2nd, opposite of to the 2nd is square root aka ^.5 and yes very good i get 3.97 as well

19. anonymous

(for the other one i rounded to 3, it was some decimal really close to 3 i think)

20. anonymous

okay.. thank you