‹gordon read 18 pages of a bookabout rockets in 40 minutes. whatwas the unit rate per hour?

First you should work out how much he read in one minute. To do that you divide the number of pages(18) by the time (40 mins).
18/40 = 0.45
Then multiply this number by 60 minutes to get the unit rate per hour.
0.45 x 60 = 27.
Gordon reads 27 pages per hour.

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Horizontal change or the change of x

If you make it a little more clear i can answer it