In this problem, you combine the like terms...
4a - 3b + 7a
4a and 7a are like terms so you add them together.
4a + 7a = 11a
So, the answer is: 11a - 3b
Answer: 18 tablespoons
Explanation: for the water, you have to multiply the 2 gallons by 3 if you want to get 6 gallons. then, you also multiply 6 tablespoons by 3 to get 18 tablespoons. you can see the ratio 2:6 is the same as the ratio 6:18, so you know it’s correct!