The total cost of hiring beth’s plumber services is represented by the equation c= 50t + 70 where c is the total cost in dollar and t is the time in hours. next month the rate change $60 per hour but the initial charge will stay the same. which equation represents the new cost structure.

a. c =50t -70. c. c = 50t + 60
b. c = 60f + 70. d. c = 60t -70

show proof of how u got that answer or evidence

Option B.

Step-by-step explanation:

Given:

The total cost of hiring Beth's Plumber services is expressed as:

Here, the coefficient of represents the rate per hour and the constant term represents the initial charge.

So, when the rate per hour changes from 50 to 60, this means the coefficient of   changes from 50 to 60. But, there is no change in the initial charge. So, 70 remains the same as the original equation.

∴ New equation is given as:

Hence, option B is correct.

step-by-step explanation: