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Non- Linear and decreasing

Step-by-step explanation:

It is a non- linear line becuase it is curved. Linear lines are perfectly straight. It is a decreasing graph because you always start from the left. Starting from the left on this graph it is sloping downwards. Hope this helps :)

Since 3:00 a.m is three hours after midnight, the variable h in the function would be three.

T(h) = -15 + 3h     step 1 - write the equation
T(3) = -15 + 3(3)   step 2 - plug in h, which is three
T(3) = -15 + 9       step 3 - simplify the expression
T(3) = -6