exam Maths Puzzle Numerical Ability

Solve the system by substitution.

x + y = 12
y = 2x

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(9nv-)/(n1/2-v1/2)







hi! i need to know the area of a regular 5 sided polygon, each side being 10cm.

the forumula for area is 1/2 the perimeter multipiled by the apothem the perimeter is 50, but i c