For this problem, you need to substitute 4 in for your variable t. the original equation is S(t) and the one you need is S(4) -- in other words, evaluate this equation when t = 4.
S(4) = 9(4) - 4
S(4) = 36 - 4
S(4) = 32 is your answer.
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The slope is 4 your adding 4 each time
A is true. 50/20=2.5
b is true. 20 people come [every] three hours.
c is false. she isn't selling 1,600 if she has 100 berries left.
so C.