exam Maths Puzzle Numerical Ability

i need help to understand these problems the steps they are odd problems therefore the answers are in the back but i do not understand how to get to them.

directions: sketch the

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exam Other Question

A man has a barn that is 20 ft by 10 ft. He tethers a cow to one corner of the outside of the barn using a 50-ft rope.

What is the total area that the cow is capable of grazing?

Please show me how you got the answer as well thank you Using the given equation, solve for x in terms of y, and solve for y in terms of x.

5y^2 + 3xy - 2x^2 = -3