Difference 3908

Determine the fourth term and the difference AP if a1 = 3.2 and a2 + a3 = 7.

Correct answer:

d =  0.2
a4 =  3.8

Step-by-step explanation:

a1=3.2 a2+a3=7 a1+d+a1+2d = 7 3d +2a1 = 7 d=(72 a1)/3=(72 3.2)/3=0.2
a4=a1+3 d=3.2+3 0.2=3.8

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