What is the slope of the line in the graph below?
a.
4
b.
1
c.
¼
d.
-4

The following statements are true:
biomass is a completely clean fuel. it doesn't release any harmful chemicals. biomass fuel is derived from biological matter such as dead plant matter and animal waste (manure). 
almost 25 percent of the world's electricity is generated by solar power plants. in 2014, the actual percent of the world's electricity generated by solar power plants is 21%.
hydropower plants can negatively affect the fish population in an ecosystem. in order to build hydropower plants, you need to build dams and the dam wall prevents the free flow of fish and disturbs natural ecosystems

However, if the workers do outside of what's normally expected, go ahead and tip.