A homebuilder tracks the cost of installing solar panels on homes. In 2020, the cost of a solar
panel installation was $2.91 per watt. The builder estimates that this cost will decrease by
4.5% each year.
Write an expression for C(t), the estimated cost of solar panel installation, in dollars per watt,
where t is the number of years after 2020.
Write your answer in the form C(t) = a(b)^t, where a and b are integers or decimals. Do not
round.