It is the same as 8 tenths





Therefore, the value of
is 12.






Hence verified.

The exponential equation for the number of protozoa can be written as ...
p(t) = 6×1.8877^t
The population size when t=5 is then
p(5) = 6×1.8877^5 ≈ 144 . . . . members
4 could be considered a common factor
0.8w + 3.6 =
4(0.2w + 0.9)
or you could call 0.4 the common factor
=0.4(2w+9)
= (2/5)(2w+9), if you want to eliminate decimals. 0.4=4/10=2/5