Initially, 1/4 of the tank was filled.
After adding 12 gallons, it was 3/4 full.
Increase in fuel filled portion =

So 2/4 of the tank = 12 gallons
1/4 of tank = 12 ÷ 2 = 6 gallons
4/4 of tank = 6×4 = 24 gallons
____________________
Portion remaining to be filled =

Fuel needed = 1/4 × 24 = 6 gallons
So you need 6 more gallons to fill the tank
Answer:

Step-by-step explanation:
Data provided in the question:
Initial volume of water = 15 liters
Concentration of salt = 4 liters per minute
x be the amount of salt, in grams, in the fish tank after t minutes have elapsed
The unknown concentration of incoming brine c.
Now,
Salt concentration per minute = 
For x amount of salt = 
Therefore,

Answer: 14/4
Step-by-step explanation:
since 4/4 is one three would be 12/4. Adding 2/4 to 12/4 is 14/4. So the answer is 14/4
Answer:
-1/2
Step-by-step explanation:
I used rise/run it went 1 unit down and 2 units to the right from point to point and since we are going down its negative
Answer:
62.96
Step-by-step explanation:
P=2l+2A
l=2·15+2·247.2
15=62.96m