Let a and b be rational numbers. Is a - b rational or irrational?

-b is rational

Step-by-step explanation:

a - b is also a rational number.

Step-by-step explanation:

 Given : a and b be rational numbers.

We have to check whether  a - b rational or irrational.

Since, Given  a and b be rational numbers.

Let us consider any two rational numbers,

and

we determine a - b as, rational

Simplify, we have,

Which is a rational number.

Thus, a - b is also

your answer is 23/2 - 13.5

step-by-step explanation:

7/2 evaluates to

multiply x and 4.5

multiply x and 1

the x just gets copied along.

the answer is x

x

4.5*x evaluates to 4.5x

multiply 3 and 4.5x

multiply 1 and x

the x just gets copied along.

x

4.5*x*3 evaluates to 13.5x

7/2-4.5*x*3 evaluates to

  + 8 =

the answer is

7/2-4.5*x*3+8 evaluates to