The answer could be (7+k)÷2
1 bed room = 12
2 bed room = 15
68 x 15 = 1020
57 x 12 = 684
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1020 + 684 = $1704 (total made)
15 two-bed room + 12 one-bed room = 27 rooms in all
Example: 
We can see that there is more than one number with the variable x, therefore, we say they're ''like terms'' and because of that they can be summed. We do this with all of the other numbers with similar variables. If no numbers with similar variables are left, like 4a, you don't do anything but write them as they are. You can also see that 8 and 9 can also be summed because neither of them has a variable, therefore they're similar.
In this step, you just do the operation with the numbers and keep the same variable.


since there are not more numbers similar in variables, this operation is done.

Answer:
Zero
Step-by-step explanation:
Since the line is a horizontal line, the slope does not change. The slope is zero.
Answer
Factor 13 out of 26x+13
= 13( 2x+1)