Aye the Answer is D ~hope that helps :)
Answer:
The answer is 10.5 in decimal form
The value of xy is 114 which is a real number.
real numbers are all numbers/points that exist at the variety line.real numbers may be divided into the following divisions:Rational numbers; any range which may be written within the form ofin which p and q are co-prime integer numbers , are called rational numbers. Irrational numbers ; all numbers which cannot be written as a simple fraction is referred to as irrational numbers.
Given two real numbers x and y . Let us consider
.
According to the question their sum is 25.
.............(i)
The difference of the numbers is 13.
...........(ii)
Now we have to solve the simultaneous equation:
adding equations (i) and (ii) we get:

Substituting the value x=19 into equation (i) we get:

Now let us find the product xy

The product xy is 114 which is also a real number.
To learn more about Real numbers:
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Answer:
-x^2 + 8x - 16.
Step-by-step explanation:
That would be -1(x - 4)^2.
= -(x^2 - 8x + 16)
= -x^2 + 8x - 16.
<em>Answer:</em>
<em>56a</em>
<em>Step-by-step explanation:</em>
<em>Hi there ! </em>
<em>8(3 + 4) = </em>
<em>= 8×3 + 8×4</em>
<em>= 24 + 32</em>
<em>= 56</em>
<em>Good luck !</em>