On average your refrigerator is on the cooling feature for a total of 9 hours per day and it takes 725 watts to run it . The total cost of running your refrigerator for one day is $0.45

Question

Use the equation c= t x r x w/1000 to find the rate

rewrite the equation to solve for r

r =

what are c,t and w

c= $

t= Hours

w= watts.

Answer 1

c = rtw/1000 (isolate r by applying the inverse function to what has been done to r the right-hand-side)

1000c = rtw (multiply by 1000)

1000c/(tw) = r

c = .45 dollars

t = 9 hours

w = 725 watts

Plug into the equations and find r.