Twenty-first 3935

Determine the twenty-first term and the difference AP if a1 = 0.12 and a1 + a2 = 0.42.

Correct answer:

d =  0.18
a21 =  3.72

Step-by-step explanation:

a1=0.12 a1+a2=0.42 a2 = a1+d  a1+a1+d=0.42  d=0.422 a1=0.422 0.12=0.18
a21=a1+(211) d=0.12+(211) 0.18=3.72

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