Topic Review Activity Active
A mineral that contains a useful substance or element, such as iron or aluminum, is an):
a vein mineral
C. ore
d. geode
b. gem
Please select the best answer from the choices provided

A

Explanation:

Hopefully this helps!

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.