8. Verify the following expressions: (i) (ab + bc) (ab – bc) + (bc + ca) (bc – ca) + (ca + ab) (ca – ab) = 0
Answers
yes
Step-by-step explanation:
HOME|RENEWABLE AND NONRENEWABLE RESOURCES
Renewable and Nonrenewable Resources
This article is part of an educational series for third and fourth graders. Renewable and nonrenewable resources, fossil fuel, and recycling are discussed.
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Renewable and Nonrenewable Resources - Articles UPDATED: JUNE 23, 2006
Renewable and Nonrenewable Resources
Recycling conserves resources and reduces waste.
Natural resources are materials or things that people use from the earth. There are two types of natural resources. The first are renewable natural resources. They are called renewable because they can grow again or never run out. The second are called nonrenewable natural resources. These are things that can run out or be used up. They usually come from the ground.
Renewable natural resources
Let's look more closely at renewable natural resources. They are the ones that can grow again. Trees are a good example. If cut down, they can regrow from seeds and sprouts. Animals are another example. Baby animals are born and grow up. They replace older animals that die.