Find The Arithmetic Mean Between -5and 7

Find the arithmetic mean between -5and 7

 

Answer:

a2=1

Step-by-step explanation:

a1=-5

n=3

an=7

an=a1+(n-1)d

7=-5+(3-1)d

7=2d−5

2d=12

d=6

a2=-5+(2-1)6

a2=−5+6

a2=1

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