Answer:
y = 20 + 0.15x
where x = each minute of talk time
y = total cost
domain [0, ∞)
range [20, ∞)
Step-by-step explanation:
Your equation is like that because you always pay $20 per month, no matter how many minutes you used. Then you have 0.15 per minute so use x as a variable placeholder for the actual number of minutes.
domain is starting from 0 because you can't have negative minutes.
range is at least 20 because you pay $20 to use it even if you don't use any minutes. So it can't be less than $20.
Answer:
0.52
Step-by-step explanation:
C because 9 + 5 is not 15 and because 13 + 5 is not 20
-5n-8(1+7n)=8
Let's simplify everything.
-5n-8-56n=8
Put the variables on one side and the numbers on the other.
-5n-56n=8+8
Combine like terms.
-61n=16
n=-16/61
Hope I helped! :)
The range for the data given is 11
