On Monday, Duncan’s skateboard shop received its first shipment of skateboards. Duncan sold 12 skateboards that day. On Thursday
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So, let's make these two values improper fractions so they're easier to work with.
So, to get the rate he grew in those months we have:
And to get the rate he grew in one month we have to divide both our numerator and our denominator by 21 to get:
aka he grew 1.24 inches in a month.
B) 3.375 
Hope this helped!
Hope this helped!