## anonymous one year ago I just need to solve 2sqrt5(105) please

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1. anonymous

@calculusxy

2. anonymous

@Vocaloid

3. anonymous

@Nnesha

4. anonymous

@peachpi

5. Astrophysics

$2\sqrt{5(105)}?$

6. anonymous

Yes @Astrophysics

7. Astrophysics

Ok so what have you tried?

8. anonymous

I don't know how to solve big square roots really. But I need this now :( @Astrophysics

9. Astrophysics

$2\sqrt{525}$ maybe that's easier, just keep simplifying that

10. anonymous

Okay I got 10 times sqrt21 @Astrophysics

11. Astrophysics

Yes! Exactly

12. anonymous

13. Astrophysics

Yup :)

14. anonymous

Okay well I'm solving this problem LAW ENFORCEMENT:  A police accident investigator can use the formula S25L to estimate the speed s of a car in miles per hour based on the length l in feet of the skid marks it left.  How fast was a car traveling that left skid marks 105 feet long? And I have to round the answer to the nearest mph @ Astrophysics

15. anonymous

@Astrophysics

16. Astrophysics

What is S25L

17. anonymous

S=2sqrt5l

18. Astrophysics

Oooh $S = 2\sqrt{5L}$

19. anonymous

Yes

20. anonymous

I need this answer in the next 3 minutes :(

21. Astrophysics

So S is your speed and L is your length this is exactly the same as your problem above

22. Astrophysics

plug L = 105

23. Astrophysics

I guess you don't have to convert any units either ft into miles or what ever does look like it

24. anonymous

so that's the answer 10 times sqrt ?

25. anonymous

Sqrt21 ? So there is no rounding to the nearest mph

26. Astrophysics

Then put it in decimals if it's asking in that

27. anonymous

What would it be

28. Astrophysics

Use a calculator..

29. anonymous

One minute left :(

30. Astrophysics

I got 46

31. anonymous

I did too! Thanks fam !

32. Astrophysics

Yw