Hydroelectricity because it is a renewable resource of water usage whereas the other 3 are just different forms of nonreneable forms of energy meaning they take millions of years for us to get them back
$79,000 divided by 12months= $6,583.33 per month
Answer:
the difference in their ages is 31/2
Step-by-step explanation:
151/2=2x15+1/2=31/2
