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Part a: p gets closer to 0, the number of T-shirt purchased increases.Part b: p gets larger, the number of T-shirt purchased decreases.What is defined as the decreasing function?As we approach towards the right side of the x-axis, the graphs of increasing and decreasing functions, respectively, shift upward and downward.  A function is considered to be decreasing on to an interval I if it has the value  f(x) ≥ f(y). for any two values in the interval I that are such that x < y.For the given function;The relation of the number of T-shirt and the price of the T-shirt are given by the function; n(p) = 800/p.The graph of the function is given as; y = n(p)From, the graph it is clear that when, the value on x axis increases, the value on y-axis decreases.Thus, the function is decreasing function.Part a: p gets closer to 0,Now, when, p gets closer to 0, the number of T-shirt purchased increases as the there is a reduction of the price of T-shirt.Part b: p gets larger.When p gets larger, the number of T-shirt purchased decreases, as there is a increase in the price of the T-shirt.Thus, the T-shirt purchased will be reduced.To know more about the decreasing function, herehttps://brainly.com/question/2649645#SPJ13