need to use interval notation to indicate the domain!

Question

anonymous · Answer

f(x)=$$f(x)=\sqrt{-7x+2.5}$$

anonymous · Answer

ignore the first f(x) at the top..

anonymous · Answer

well your value of x has to make sure that what's under the root isn't negative. So, -7x +2.5 > or = to 0. So, 7x > or = to 2.5, x>= 2.5/7. so, I'd say [5/14, + infinity)

anonymous · Answer

wait what I said doesn't make sense

anonymous · Answer

it says to round any decimals to two decimal places.  Thanks! Since this is an online assignment I want to make sure to type it in correctly.

anonymous · Answer

ha.  I don't understand this section well so I didn't catch any errors.. hmm

anonymous · Answer

it has to be smaller than 5/14, not greater. Forgot to change the sign when I multiplied by -1

anonymous · Answer

0.36 is 5/14 rounded to 2 decimals

anonymous · Answer

sorry about the mistake before

anonymous · Answer

so 0.36 should be the answer? or .36? this online thing is really picky about correct format.

anonymous · Answer

interval notation would be (-infinity, 0.36]

anonymous · Answer

I don't think I can type infinity. is there a sign for that or something?

anonymous · Answer

Sorry I'm so clueless.. and thanks for your help. I appreciate it!

anonymous · Answer

$$\infty$$ is the sign for infinity, just add a - in front of it for the negative.
No Problem!

anonymous · Answer

I realized that after I asked. Thanks!