Answer:
5
Step-by-step explanation:
y=-2/3x-1
is the equation
a) n+5
6, 7, 8, 9, ..., 15
b) 2n-1
1, 3, 5, 7, ..., 19
Gallons
Since its a fish tank and in high diameter it would be used for a big measurement unit so the answer would be gallons.