Which of the following holds true for energy coupling?
energy is released in an exergonic reaction.
energy is transferred from an exergonic process to an endergonic one.
energy is consumed in an endergonic reaction.

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.

i'd say that the moon rock is about 2.2 billion years old.