Start with the last two choices.
You have x + 5 and x - 5 in the square root.
A square root can never be negative.
That means that the lowest value y can have in the last two choices is 0.
The range does not include -4.

Now look at choice B.
sqrt(x) is at least 0.
Then you add 5.
The range does not include -4.

Now look at choice A.
sqrt(x) is at least 0.
Now you subtract 5.
The lowest value y can have is -5. That includes -4.
Choice A is the answer.
y will be at least 5.

6 0

3 years ago

While riding her bike to the ocean and back home 66 times, mandi timed herself at 52min52⁢min, 48min48⁢min, 56min56⁢min, 55min55

valentinak56 [21]

But if she went back to the ocean and back home 66 times why doesn't she have 66 time trials instead of only 7? anyways it wouldn't even be possible for her to have a goal of averaging 52 minutes. :/

7 0

3 years ago