A student needs to make a circular cardboard piece with an area between 154 square inches and 616 square inches. The function f(r) relates the area of the cardboard piece, in square inches, to the radius r in inches. Which of the following shows a reasonable domain for f(r)?

Question

anonymous · Answer

7 < r < 14
	154 < r < 616
	all positive integers less than 7
	all positive integers between 14 and 154

anonymous · Answer

So the domain is all the values of r that satisfy the conditions. So the smallest r has to give an area no less than 154 sq in. And the largest r has to give an area no more than 616 sq in. Does that help?

anonymous · Answer

So the answer cant be B

anonymous · Answer

No, that would be the domain of a function that uses area as its x. This function uses r. o you have to find the values of r that satisfy those conditions.

anonymous · Answer

Okay, but that still means that the answer can not be B right?
I am starting with the process of elimination.
Am I wrong that the answer isn't B?

anonymous · Answer

No, you're not wrong, the answer can't be B.

anonymous · Answer

Thats what I am saying! The answer can NOT be B.

anonymous · Answer

And the answer can't be D either right?

anonymous · Answer

Nope, can't be D either. If the domain was an integer over 14, that would make the largest possible circle too big.

anonymous · Answer

So the answer is A right?

anonymous · Answer

Yep. Good job!