Answer:
gallon
Step-by-step explanation:
A gallon is a measuring unit used to measure the liquid capacity. It helps in measuring the volume and capacity of a fluid. The capacity of one gallon is equivalent to 3.79 liters. It is used to denote the measurement of approximately four liters of liquid.
Mrs. Larivierre had filled a tub with water. To measure the water content of the tub, the most appropriate unit would be a gallon.
X = 12.25 and I’m typing this to get to 20 characters
Answer: 
Step-by-step explanation:
Given the following expression shown in the picture:

You need to use a process called "Ratinalization".
By definition, using Rationalization you can rewrite the expression in its simplest form so there is not Radicals in its denominator.
Then, in order to simplify the expression, you can follow the following steps:
<em>Step 1</em>. You need to multiply the numerator and the denominator of the fraction by
, which is the conjugate of the denominator
.
<em>Step 2</em>. Then you must apply the Distributive property in the numerator.
<em>Step 3</em>. You must apply the following property in the denominator:
Therefore, applying the procedure shown above, you get:

<em>Step 4</em>. You can observe that the expression can be simplified even more. Since:

You get:

180 - 124 = 56
4x = 180 - (56 + 60)
4x = 180 - 116
4x = 64
x = 16
answer
B. 16