exam Maths Puzzle Numerical Ability

Give the domain and range of the relation.
x y
5 11
6 13
0 0
-8 -15

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exam Other Question

Geometry. The length of a rectangle is 1 cm longer than its width. If the diagonal of the rectangle is 4 cm, what are the dimensions (the length and the width) of the rectangle?

I am needing some help with this, can you please help me? Thanks if f(x)=3x+7 what is f(-4)