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Given expression = −50x+100.

Let us understand the structure of the above expression.

Actually above expression is written in slope-intercept form.

y= mx+b, where m is the slope and in other words we call a slope " rate of change", and b is the y-intercept, we take b as fix value.

If we compare −50x+100 by slope-intercept form mx+b, we can see that coefficent of x is -50 there,

Therefore, m=-50.

So, the rate of change of the bank account balance(in dollars per month) = $50/month.

And because it is a negative 50, so we could say the rate of decrease per month is $50.

Step-by-step explanation:

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