Use the graph of the function f to find approximations of th

Use the graph of the function f to find approximations of the given values.

from graph

a) f(-15) = -a = -5

b) f(0) = a = 5

c) f(5) = 0

d) f(10) = a = 5

e) [f(15) - f(10)]/(15 -10)

f(15) = a = 5

==> [f(15) - f(10)]/(15 -10) = [5 - 5]/(15 -10)

==> 0/5

==> 0

Hence [f(15) - f(10)]/(15 -10) = 0