Must do multiplication first....
-2/5 - 3/7 x 7/10
-2/5 - 21/70 (I'll reduce 21/70)
-2/5 - 3/10
Now you have to find a common denominator and subtract
-35/50 = -7/10......is what I get
90 days=3 months
5,000×0.05×3=750
11/44 reduces to 1/4
1/4 of the trout caught were tagged.
185 trout were tagged
185 / 1/4 = 740
There are 740 total trout.
It would be 9 ft. using the knowledge of

times the diameter (

equals aprox. 3.14) equal the circumference of a circle, and since we know the circumference, we need to divide that by

to get the diameter.
equation: 28/3.14=8.913
rounding that would bring it to 9 ft.