Determine AP

Determine the difference of the arithmetic progression if a3 = 7, and a4 + a5 = 71

Correct answer:

d =  19

Step-by-step explanation:

a3=7 a4+a5=71 a3+d+a3+2d = 71 2a3 + 3d = 71 d=(712 a3)/3=(712 7)/3=19

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