anonymous 4 years ago f(x)with radical sign 0.5x-5;f(20),f(16),f(12),f(14) f(20)= find domain of the function

1. anonymous

can any one solve this

2. Mertsj

$f(x)=\sqrt{.5x-5}$

3. Mertsj

Is that the function?

4. Mertsj

If it is the domain is all the numbers that make .5x-5 positive or 0

5. Mertsj

$\frac{1}{2}x-5\ge0$

6. Mertsj

$x \ge10$

7. Mertsj

That is the domain.

8. Mertsj

$f(20)=\sqrt{.5(20)-5}=\sqrt{5}$

9. Mertsj

$f(16)=\sqrt{.5(16)-5}=\sqrt{8-5}=\sqrt{3}$

10. Mertsj

$f(12)=\sqrt{.5(12)-5}=\sqrt{6-5}=\sqrt{1}=1$

11. Mertsj

$f(14)=\sqrt{.5(14)-5}=\sqrt{7-5}=\sqrt{2}$

12. anonymous

type an integer or decimal rounded to the nearest tenth as needed

13. anonymous

14. Mertsj

Do you have a calculator?

15. anonymous

yes

16. Mertsj

Then pick it up and type square root 5 and see if you don't get 2.2

17. anonymous

yes

18. Mertsj

Now do the others in the same way.

19. Mertsj

What is the square root of 3?

20. anonymous

1.7

21. Mertsj

What about the square root of 2?

22. anonymous

1.4

23. Mertsj

So now you have all the answers.

24. anonymous

so domain of f(x) is all real numbers x where ?

25. Mertsj

You know, it would really be nice if, when you ask for help, and someone helps you that you would have the common courtesy to read what they wrote.

26. anonymous

1 am with you