Need a clear explanation and answers! Thank you!

see below

Explanation:

the intervals where f(t) is positive is when the piece wise function has a positive value (not y, y is the integral of f(t))

a) f is positive over [1.4, 3.4]

   f is negative over [0, 1.4] ∪ [3.4, 6]

   f is zero over intervals {1.4} ∪ {3.4} ∪ {6}

b) maximum = 2

   minimum = -3

   I don't know why it shows that your answer is wrong, if it keeps        showing its wrong, try the integral max and min

the integral max is 2.3

the integral min is -3.1

c) avg value of integral is: , so

avg value of  over [0, 6] is:

=

= or

avg value of  over [0, 6]: