book Maths Puzzle Numerical Ability

How do you know the angles of hypotenuse and obtuse?

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book Other Question

Suppose that as you throw the rock you give it a forward motion of 20 feet per second. the rock will hit the the ground __ feet away from you. Measured horizontally. Can someone help me with this question?

Describe a simple process for using rates and unit prices that can help someone having difficulty understanding these concepts. Include an example explaining the solution process.
Thanks,
Sher