Your cell phone plan costs $24.99 per month plus $0.13 for each text message you send or receive. You have at most $28 to spend
1 answer:
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First we distribute 
into 
and 
.
That makes the left side of the equation
Now we subtract
from 
, which makes 
Now the equation is
Our goal is to isolate, so we both sides by 30
That will make the equation
We multiply -1 on both sides of the equation:
Finally we simplify
, which makes 
So the answer is
That makes the left side of the equation
Now we subtract
Now the equation is
Our goal is to isolate
That will make the equation
We multiply -1 on both sides of the equation:
Finally we simplify
So the answer is
Answer:
C = $2.40
n = 6
Step-by-step explanation:
For Noelle,
Equation that represents the monthly cost 'C',
C = 0.2n + 1.20
Here, n = number of checks written in a month
For Micah,
Monthly cost for writing checks 'C' = $1.20
Number of checks 'n' = 3
Since, Cost of writing checks ∝ Number of checks written
C' ∝ n
C' = kn
k =
Here, k = proportionality constant
For C' = 1.2 and n = 3
k =
k = 0.4
Equation will be,
C' = 0.4n
For any month C = C'
Therefore, 0.2n + 1.20 = 0.4n
0.4n - 0.2n = 1.20
0.2n = 1.20
n = 6
Number of checks written by Noelle and Micah = 6
For n = 6,
C = 0.2(6) + 1.20
C = $2.40
Cost of writing checks = $2.40