book Maths Puzzle Numerical Ability

How do i work with finding the length of all three sides to an special right triangle with the measures of two yards for side "a".

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book Other Question

Please help me!

20 sub sandwiches to be shared equally among 36 people, will allow each person what of a sub?
directions: solve by graphing.

-3<_x<_2 (-3 is less than or equal to x which is leass than or equal to 2)
y<-2x+1 (y is less than -2x+1)

(i do not understand how to graph