book Maths Puzzle Numerical Ability

help!!! solve the system by addition -4x+7y=-10
x-5y=9

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Hello, i need help to multiply this problem. If anyone could help me, thanks so much



(5√[2] + 3)(√[2] - 2√[3])
The marvin small manufacturing plant produces two kinds of bikes, 3-speed and 10-speed in two factories. Factory A produces 16 3-speeds and 20 10-speeds in one day, while factory