Find the exact interval of convergence for the power series n

why is the one on the left? and why does it go after 2 instead of 3?

Simplify, 5. (16+2)2-2-(8-5)² 5-(16+2)2-2-(8-5)² = (

Why is "3" is not the same as 3?

y = -x-4 X-y= -6 (-5,1)

( 4 + -9) ÷ [ -10 - (-5)] • (-2)

-7+-8

The accompanying figure shows angle 0 in standard position with its terminal side intersecting the unit circle at (0,1). Evaluate the functions of 0. cos 0 = (Type exact answers, using radicals as needed. Type N if the function is undefined.) sin 0 = (Type exact answers, using radicals as needed. Type N if the function is undefined.) tan 0 = (Type exact answers, using radicals as needed. Type N if the function is undefined.) sec 0 = (Type exact answers, using radicals as needed. Type N if the function is undefined.) csc 0 = (Type exact answers, using radicals as needed. Type N if the function is undefined.) cot 0 = (Type exact answers, using radicals as needed. Type N if the function is undefined.)

-2-(-4)

Please help