One smartphone plan costs $48 per month for talk and messaging and $8 per gigabyte of data used each month. A second smartphone plan costs $78 per month for talk and messaging and $3 per gigabyte of
data used each month. Let c represent the total cost in dollars and d represent the amount of data used
The system of equations
= 48 +8d
can be used to represent this situation.
C = 78 +3d
in gigabytes
How many gigabytes would have to be used for the plans to cost the same? What would that cost be?
C

plz mark brainliest i took the test

yes, gavin is right.

step-by-step explanation:

gavin is correct. 

this problem is about converting 9% per year to how many percent per quarter. the rate is still the same. it only differed in the time period. so, through dimensional analysis,

9% per year  × (1 year / 4 quarters) = 2.25% per quarter

if he was asked to convert 9% per year to how many percent per quarter  compounded quarterly, then you will not simply divide by four. this is because compounding is not linear.

hope this , have a good day. c;

a+b=c is your answer