Take 220 and multiply it by the 2 hours. Then take the product of that and multiply it by 14-2 weeks. After that, do the product of that times 0.12 and you have your answer. Hope that helped. Let me know of you got confused.
Step-by-step explanation: First, find the watts used per day. 220 x 2 = 440 Wh. Then find the watt-hours used for two weeks. 440 Wh x 14 = 6160 Wh. Convert Wh to kWh. 6160 Wh (1 kWh/1000 Wh) = 6.16 kWh. Calculate the cost. 6.16 kWh x $0.12 = $0.74
Let's denote Cindy's age which is unknown with X We know that Cindy's age is 3 times her age 6 years ago. 6 years ago Cindy's age was the present age (X) - 6 : X-6 The fact that the present age is 3 times her age 6 year ago can be written as: 3*(X-6) So, finally: X=3*(X-6)
