book Maths Puzzle Numerical Ability

REGULADCON is a regular decagon. If each side of the decagon measures 10, find the length of RG.

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book Other Question

factor and simplify

3x^2+6x^3+12x 5/8 of the vehicles in the parking lot are cars. The rest are vans and trucks. If there are 780 cars in the lot, how many total vehicles are in the lot?