Gabriel borrowed some money from his friend in order to help buy a new video game system. Gabriel agreed to pay the friend back some amount every week until his loan was paid off. Let LL represent the amount Gabriel owes his friend after tt weeks. A graph of LL is shown below. Write an equation for LL then state the slope of the graph and determine its interpretation in the context of the problem.

LL is negative because at t=2 LL=-30. At this point the slope of the graph is -1/4, or one fourth.

The correct answers are "Clean air is essential for health and survival", "Clean air reduces risk of illnesses and other health problems" and "Clean air supplies oxygen that enables living organisms to breathe".
Explanation:
Clean air is a natural resource that provides oxygen that enables living organisms to breathe by a series of complex interactions that involve the intake of carbon dioxide from photosynthetic organisms. Clean air is essential for health and survival because aerobic organisms, such as humans, need oxygen to obtain energy from food. Also, clean air reduces risk of illness and other health problems; particularly, the risk of having diseases related with the respiratory system.

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