exam Maths Puzzle Numerical Ability

[3(4-9)-2]-[6-(4-3)]=

Can some body please help me with this problem. I do not understand at all.

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exam Other Question

Find the Fahrenheit temperature of hot tap water at 70 degree C by solving the equation:

70= 5/9 (F-32)


Thank you!!!
1: For questions 1 – 4: Find the equation of the inverse for each of the following which is one-to-one. Solve each for y.

2x + 3y = 6
y = (6-3x)/2
y = (-3x)/