Pls help I’ll brainlest

Given f(x) = 17-x^2what is the average rate of change in f(x) over the interval [1, 5]?

Find the arc length parameter along the given curve from the point where tequals=0 by evaluating the integral s(t)equals=integral from 0 to t startabsolutevalue bold v left parenthesis tau right parenthesis endabsolutevalue d tau∫0tv(τ) dτ. then find the length of the indicated portion of the curve r(t)equals=1010cosine tcost iplus+1010sine tsint jplus+88t k, where 0less than or equals≤tless than or equals≤startfraction pi over 3 endfraction π 3.

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?