1. 16
2. 10
3. ?
4?
for 3 and 4 I think you use a protractor

The arc length is given by
<h2>
Hello!</h2>
The answer is: 
<h2>
Why?</h2>
Since we don't have the function equation, but we have the graphic, we can use it to know what value of x makes the function equal to 0.
Finding what values of x does
means that we should find where the function intercepts the x-axis.
From the graphic, we can see that the functions intercepts the x-axis at 
Have a nice day!
The sum does not converge because
.