For #1, you should have learned an arc length formula - you can just plug in the function and limits to get the answer.
I have a 3 part question and I'm not sure about my answers. Can you help? (It's for an online practice quiz)
2. http://i58.tinypic.com/346wak9.jpg w/ http://i59.tinypic.com/717bs7.jpg
I'm pretty sure about part 1, but the other two I've spent a long time on and I keep getting different answers. What should I be getting?
I just started with #1. You've posted a lot of questions lately.
It's a lot easier to look at a solution and see if there's a problem as opposed to solving the problem and comparing results.
The formula for arc length is . Since , , so the integrand is , and the third answer is correct.
In #2, the fourth answer is correct. You bring out of the square root instead of .
In #3, the second answer is correct.