Need help on figureing out how to do this sooon! :ll

Can some one please help me figure out how to do this?
1. what is the area of a triangle whose base is 4 yards and height is 7 yards?

2. what is the length of each side of a square whose perimeter is 40 feet? 

3. what is the volume of a rectangular prism whose length is 5 feet, width is 3 feet, and height is 2 feet?

please help  

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