Is there supposed to be a picture? I can't answer the question.
What about it? 7x+5 equals what
Answer:
$6
Step-by-step explanation:
$25 divided by 50 = 50 cents a CD
50 cents = 0.5
Now do,
$12 x 0.5 = $6
$6
Answer:
20
Step-by-step explanation:
x^2+18x-160
If you put this into your calculator or desmos, you will get a parabola. You want to know the value of x when y=600. You can look at the table for the graph or scan to where y = 600. The value of x is 20 at that point.
To check you can plug 20 in for x. When you do that, y = 600.
I am assuming that your function is

due to the fact you did not write x-1
the domain is the numbers you can use for x without getting wierd results
wierd results happen when you divide by 0 or take the square root of a negative number
the arean't any division signs so no division by 0
but there is a square root sign
so the part under the square root must be greater than or equal to 0
find where it is equal to 0
0=x+6
minus 6
-6=x
when x is smaller than -6, we get undefined because we get square root of a negative
so the domain (numbers you can use for x) is D={x|x≥-6} or basically x≥-6