8. For the years betwe
number of compu
e vears between 1990 and 1999 the
imber of computer games sold (in thousands
per annum by a company can be estimated by
the formula g = -264 + 20t + 7, where
+ represents the year (for example, t=5
a company can be estimated
represents 1995).
(i) How many games were sold in 19972
(ii) In which half of the decade were more
games sold: 1990 to 1994 or 1995 to 19992
(iii) In which years were 25,000 games sold?
(iv) After the year 2000, this formula was
no longer valid. Give a reason why this
was the case.