2. a) name one way the light reactions and dark reactions are similar and one way they are different.

Answer is as follows

Explanation:

1. They are similar as energy is the main source in these both reactions.

1. In light reactions energy is taken from sunlight while in dark reactions the created energy in light reactions is used.

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.

substitution is the answer in this case