book Maths Puzzle Numerical Ability

2x-5(x+3)=81

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book Other Question

Can you help me solve this equation?

sqrt 2y+7 + 4 = y

The 2y+7 is in the radical sign
Thanks I need to find the square root of the fraction 64/100? This is multiple choice A.4/5 B. the square root of 4/ the square root of 5 C. the square root of 8/ the square root of 10 D. 4 to the square root of 2/ 10? Please help me, thank you very much!