
This may look scary, but all you have to do is distribute, first:

Now it's much easier (remember to distribute the negative):

So, the entire thing simplifies to
-2c. NEAT!
Answer:
y
4,
y ∈ [-∞, 4]
Step-by-step explanation:
Remember, the range of the function is all possible output values or y values.
As per the graph, it appears that the output, the y value, is less than or equal to 4. Hence:
y
4
or
y ∈ [-∞, 4]
is the range, both are the same, they are just different ways of writing it.
First number is x.
Second number is (x+1).
Their sum is (x+x+1)=(2x+1)
2x+1=25
2x=25-1
2x=24
x=12
x+1=13
Numbers are 12 and 13.
The area would be 12.57
Hope that helps you! :)