Question 839007
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Hi,
 A sequence is formed by multiplying each term by 3 and adding 3 to get the next term. 
If the fifth term is 39, what is the value of the first term? 
Working backwards:
{{{a[5] = 3*a[4] + 3 = 39}}}, {{{a[4] = 12}}}
{{{a[4] = 3*a[3] + 3 = 12}}}, {{{a[3] = 3}}}
{{{a[3] = 3*a[2] + 3 = 3}}}, {{{a[2] = 0}}}
{{{a[2] = 3*a[1] + 3 = 0}}}, {{{a[1] = highlight(-1)}}}
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