you're given all those values, h,k and r, so just plug them in
We are asked to find a function of the cost given the monthly fee and the costs per minute.
Let x be the number of minutes used, we need to multiply the number of minutes by the rate of cost per minute and add that to the monthly fee, like this
That gives us the function of the cost.
25x + 15y = 265
x+y = 13
Step-by-step explanation:
Step 1:
Given
Number of shirts Leah can iron in an hour = 25 shirts
Number of shirts Christopher can iron in an hour = 15 shirts
Total number of hours worked by both = 13 hours
Total number of shirts ironed by them = 265 shirts
Step 2 :
Let x represent the number of hours Leah works and y represent the number of hours Christopher works
Leah irons 25 shirts in one hour, so in x hours he would iron 25x shirts
Christopher irons 15 shirts in one hour, so in y hours he would iron 15y shirts
Given total shirts ironed by them together is 265 , we have
25x + 15y = 265
They worked a combined of 13 hours, so
x+y = 13
Step 3:
The system of equations that could be used to determine the number of hours Leah worked and the number of hours Christopher worked are ,
25x + 15y = 265
x+y = 13
Answer:
Step-by-step explanation:
Part A
The function representing the amount of money in account A after x years is represented by the function
f(x) = 9,628(0.92)x
The amount of money in account A is decreasing by 8% per year.
Part B
The table showing the amount g(r), in dollars, of money in account B after r years with number of years given as 1 2 3 4 and amount in dollars) 1,375 1,512.50 1,663.75 1,830.134.
Looking at the table,
The change per year is
(1512.5 - 1375)/1375 = 137.5/1375 = 0.1
The percentage change is 0.1× 100 = 10%
The amount in account B increases by 10%
Therefore, account B recorded a greater percentage change in amount of money over the previous year since the change in account B is 10℅ which is greater than 8% in account B
