Answer:
See attachment
Step-by-step explanation:
The table that represent a direct variation is shown in the attachment.
To determine a direct variation from tables, you need to inspect the y-intercept of each table.
If there is a table with y-intercept of 0, then it represents a direct variation.
Or you could check the table with equation of the form: 
if you cannot see zero in the y-intercepts directly
Answer:
3 hours
Step-by-step explanation:
24/7 = 3.42 hours and rounded that will be 3 hours
(10 + y)² - y² = 3x + 12
(10 + y)·(10 + y) - y² = 3x + 12
10² + 20y + y² - y² = 3x +12
100 + 20y = 3x + 12
100 - 12 = 3x - 20y
3x - 20y = 88
3x - 20 y - 88 = 0 (I suppose it is that one, simplifyied and in order of the letters, or that it you at the previous step)
Answer: 4.5 gallons
Step-by-step explanation:
1 gallon of water per inch of grown fish. For example, if you have a black neon tetra, the average adult size of which is 1.5 inches, that fish would need 1.5 gallons of water. If you have three, your tank should be at least 4.5 gallons.
