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59. an = a1 + (n-1) d
So an – a1 = (n-1) d
Best now to put brackets round Left side
( an – a1) = (n-1) d
Divide both sides by d to isolate the n part
( an – a1)/ d = (n-1)
So n -1 =( an – a1)/ d
Add 1 to both sides
n = ( an – a1)/ d + 1 answer
60 an = a1 + (n-1) d
Divide both sides by (n-1) to isolate the d part
( an – a1)/ (n-1) = d
answer to 60 can also be written
d =( an –
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