Answer:
Step-by-step explanation:
Given: expressions
To find: expression that denotes a rational number
Solution:
A number of the form 
where p and q are integers and 
is said to be a rational number.
Sum of a rational and irrational number is irrational.
In 
, 
is a rational number and 
is an irrational number
So, is not a rational number.
In 
, 
is an irrational number and 4 is a rational number
So, 
is not a rational number.
In 
, 
is a rational number
So, is a rational number
In 
, 
is a rational number and 
is an irrational number
So, is not a rational number.
Do you know what the first step is
<h3>
Answer: D) 7</h3>
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Explanation:
a31 means "the value in the third row, first column". That value is 7
As another example, a22 = 3 since 3 is in the second row, second column.
Another example: a12 = -1 because we're in the first row and second column.
This is a 3x2 matrix due to it having 3 rows and 2 columns.
The answer is 225
I got that by mulitplying .15 by 1500
