We want to see which ones of the shown functions are decreasing. The correct options are the top-left and the bottom-right graphs.
We define a decreasing function f(x) as a function which value, f(x), decreases as x increases.
In a graph, we can know if a function is decreasing if, reading from left to right, we can see that the graph of the function goes downwards.
Only with this, we can see that the two graphs with that property are the top-left graph and the bottom-right graph. So these two are the ones that represent decreasing functions.
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