exam Maths Puzzle Numerical Ability

can you write me a two column proof for the polygon exterior angle-sum theorem? Im using a pentagon. thank-you!

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exam Other Question

If a ball is thrown upward from the ground, the equation to find the height h of such a ball thrown with an initial velocity ft/s is of {{{48^hltj=48t-16t^2}}} Find the time tha I need help please.
Solve by substitution.

5x-2y=-5
y-5x=3