exam Maths Puzzle Numerical Ability

Factor the following
x^2+-9+1x

bx^2+-7+-5

x^2+-36

3x^2+11x+4

x^2+8x+7

5x^2+x-18

9x^2+bx-8

26x+x^2-18

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exam Other Question

Solve the system by any method

{x=9/2+5
2x-9y=10 If an earthquake measured 5.9 on the Richter scale, what was the intensity of the earthquake? Use the formula M=log(A/Ao).