is the change in what is on the horizontal axis (quantity) divided by the change in what is on the vertical axis (price).

inverse slope of the price against quantity

Step-by-step explanation:

In mathematics, a plot of the vertical axis against the horizontal axis is termed 'slope', but when we plot the horizontal against the vertical it's termed as 'inverse slope'.

So the plot of quantity against price is the inverse if price gradient.

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walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.