Question 1204114
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{{{a[1]}}} = first term = -0.5
{{{a[48]}}} = 48th term = 140.5
{{{a[n]}}} = nth term
n = number of terms = 48
d = common difference


{{{a[n] = a[1] + d(n-1)}}}


{{{a[n] = -0.5 + d(n-1)}}}


{{{a[48] = -0.5 + d(48-1)}}}


{{{140.5 = -0.5 + d(47)}}}


{{{140.5 = -0.5 + 47d}}}


{{{47d-0.5 = 140.5}}}


{{{47d = 140.5+0.5}}}


{{{47d = 141}}}


{{{d = 141/47}}}


{{{d = 3}}} is the common difference
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