Question

A room starts with 3 ft square of dust. The dust increase at a rate of 45% a week

A.) Write the equation
B.) How must dust will be in the room after 14 weeks

Answer 1

w = number of weeks
45%·3 = dust added by 1 week
(
`45\%\cdot3=(45)/(100)\cdot3=(135)/(100)=1.35`)
d = total of dust

A.)
d = 3 + 1.35w
B.)
w=14
d = 3 + 1.35·14 = 3 + 18.9 = 21.9