Answer:
Step-by-step explanation:
The slope of y = -5/4x + 4 is -5/4. The y-intercept is 4.
The slope of y=3/2x-7 is 3/2. The y-intercept is -7.
The total cost function is the sum of the two given functions, and this is equal to:
c(t) = 190 + 70*t
<h3>
How to find the linear function for the total cost?</h3>
We know that:
- The plumber charges p(t) = 115 + 25*t
- The electrician charges e(t) = 55*t + 75.
If she hires both of them for the same time t, then the total cost function will be given by the sum of the two above functions, we will get:
c(t) = p(t) + e(t)
c(t) = (115 + 25*t) + (55*t + 75)
c(t) = (115 + 75) + (55*t + 25*t)
c(t) = 190 + 70*t
If you want to learn more about linear functions, you can read:
brainly.com/question/4025726
A=7800(1.00433)^132
A=7800*1.768844
<em><u>A=$13796.98</u></em>