I need help understand these two questions #13, and can please explain step by step the process.  Thank You

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 93E
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 I need help understand these two questions #13, and can please explain step by step the process. 

Thank You

13. Two hours after the start of a 100-kilometer bicycle race, a
cyclist passes the 80-kilometer mark while riding at a velocity
of 45 kilometers per hour.
(A) Find the cyclist's average velocity during the first two
hours of the race.
(B) Let f(x) represent the distance traveled (in kilometers)
from the start of the race (x = 0) to time x (in hours).
Find the slope of the secant line through the points
(0,ƒ(0)) and (2, f(2)) on the graph of y = f(x).
%3D
(C) Find the equation of the tangent line to the graph of
y = f(x) at the point (2, f(2)).
Transcribed Image Text:13. Two hours after the start of a 100-kilometer bicycle race, a cyclist passes the 80-kilometer mark while riding at a velocity of 45 kilometers per hour. (A) Find the cyclist's average velocity during the first two hours of the race. (B) Let f(x) represent the distance traveled (in kilometers) from the start of the race (x = 0) to time x (in hours). Find the slope of the secant line through the points (0,ƒ(0)) and (2, f(2)) on the graph of y = f(x). %3D (C) Find the equation of the tangent line to the graph of y = f(x) at the point (2, f(2)).
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