exam Maths Puzzle Numerical Ability

Hi Can I have some help with finding this function?

Find a function whose graph is the bottom half of the circle x^2 + y^2 = 25.

f(x) =

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exam Other Question

Solve the system of equations by graphing. Then classify the system as consistent or inconsistent; and the equations as dependent or independent.

3x-y=23
3x+4y=13

HELP i need to find the diaganol of my computer monitor using a^2+b^2=c^2
L=13"
W=8"
D=????