For a service call, a furnace technician charges an $85 initial fee, plus $50 for each hour he works. a) Write an equation represent the total cost, C dollars, for t hours of work.

b) If the repair takes 2 hours, how much will the customer be charged?

c) If a customer was charged $210, how long was the service call?

d) How would the equation change if the technician charges $95 initial fee plus $40 for each hour he works? Will the technician be making more for working 3 hours with this change?

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step-by-step explanation:

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15

current in the circuit at time t is /, then the power delivered to the resistor is

step-by-step explanation:

step-by-step explanation:

to determine whether a given function is even, we simply substitute x with -x in the expression. if the result after simplification is identical to the original equation, then the function is said to be even other wise odd.

f(-x) = (-x)^2 - (-x) + 8

      = x^2 + x +8

the resulting function is not identical to the original one;

f(-x) ≠ f(x)

therefore, f(x) is not an even function