The covalent bonds formed when positive hydrogen atoms share electrons with the (negative) oxygen atom results in water being a molecule.

Explanation:

This is called hydrogen bond, although, very weak, positive & negitive atoms are always attracted to eachother.

Think of it as a polynomial equation, before the equal sign is the opposite effect of the rt. side of the equation, you have to equate the opposite of the equal sign..geesh, I hope this makes sense enough to help you...

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.

just go with your heart buddy