## anonymous one year ago JHGJHGMNH NH H

1. anonymous

i think it's D b.c range is y and 9 is Y and it's a positive 9 so it should be 9 in more? someone should check me.. please

2. anonymous

@jim_thompson5910

3. anonymous

@freckles

4. freckles

f(time)=a function of (number of video games) anyways the input time represents the domain and f(time) aka number of video games represents the range you said the domain was non-negative values values like 0,1,2,3,4,... and so on... but if f(x) = 6x + 9 then f(0)=6(0)+9=9 and f(1)=6+9=15 and so on... so yes the outputs are 9 or more

5. anonymous

yaaaaaaaaay ! thank you :)

6. freckles

and also non-negative values can include decimal numbers but f(0)=9 and f(1/2)=6(1/2)+9=3+9=12 and f(1)=15 so anyways just trying to show it the number values are increasing starting at 9

7. freckles

replace f(x) with 3 and solve for x

8. freckles

$f(x)=\frac{4x+1}{3} \\ f^{-1}(3)=x \text{ implies } f(x)=3 \\ \text{ so replace } f(x) \text{ with } 3 \\ 3=\frac{4x+1}{3} \\ \text{ Solve for } x$

9. anonymous

is it 2

10. freckles

yes 3(3)=4x+1 9=4x+1 8=4x x=2 so f(2)=3 which means $f^{-1}(3)=2$

11. anonymous

alright the first question was wrong. i got a 77% on this test which is better the an D or F but thank you

12. freckles

you are saying the question you asked before the inverse question"?

13. freckles

all the options had time being non-negative f(x)=6x+9 would definitely have range y greater than or equal to 9

14. anonymous

i guess C was it then

15. anonymous

but its ok... i passed

16. freckles

|dw:1437704714373:dw| yep for domain x greater than or equal to 0 we definitely have range is y greater than or equal to 9 that is a visual way to look at it a algebraic way is to do the following: we are given: $x \ge 0 \\ \text{ multiply both sides by } 6 \\ 6x \ge 0 \\ \text{ add both sides by } 9 \\ 6x+9 \ge 9 \\ f(x)=6x+9 \\ \text{ so } f(x) \ge 9$

17. freckles

So if they didn't have the option where the range was y greater than or equal to 9 where the domain was nonnegative real numbers then they are actually wrong

18. anonymous

you might be right,, but its okhay lol i passed the test with an C thank youuu

19. freckles

oh I didn't know I was helping with a test.

20. anonymous

yeah, but thank you

21. UsukiDoll

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