Question 1106824
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The expression 0.1m + 2.3 gives the distance traveled in miles after m minutes.

What is miles traveled after 25 minutes ?
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Do as the condition says: substitute m= 25 into this expression 

    Distance = 0.1*m + 2.3.


You will get 0.1*25 + 2.3 = 2.5 + 2.3 = 4.8 miles.



Next, make the same for the other value m = 30:

    Distance = 0.1*30 + 2.3.


You will get 0.1*30 + 2.3 = 3 + 2.3 = 5.3 miles.
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That's all.