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How do you calculate the sum of all internal angles of a regular polygon?

Use the formula (n-2)*180 where n is the number of sides on the polygon.

BC

Answered by Ben C. • Maths tutor

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If you are given the function f(x) = 10-3x and g(x) = (x-3)/2 , find the value of the composite function gf(4) ?

Rearrange y = (3x+5)/x to make x the subject

Solve the simultaneous equations: 2x-y=x+4; x^2+4y^2=37

Make y the subject of the formula: p = √x+y/5