Tiles are stacked in rows on the trapezoidal-shaped roof. At the ridge are 15 tiles, and each subsequent row has one more tile than the previous row.

How many tiles are covered the roof if the lowermost row has 37 tiles?

Correct answer:

x =  598

Step-by-step explanation:

a1=15 an=37 d=1  an=a1+(n1)d n=3715+1=23  x=2n(a1+an)=223(15+37)=598

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