Find the value of X in the triangle shown below.
Choose one answer
C) x=15
D) x =21

1st integer x

2nd integer x+1

3rd integer x+2

4th integer x+3

x+x+1 +x+2+x+3 =74

combine like terms

4x+6 = 74

subtract 6 from each side

4x = 68

x = 17

the integers are 17,18,19,20

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the one where 1 and 2 are directly across from each other.  

see image