exam Maths Puzzle Numerical Ability

3b+1=13;4 is this a solution yes or no

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exam Other Question

Write the equation of the line L satisfying the given geometric conditions.

L has y-intercept (0, 2) and is perpendicular to the line with equation 2x-3y=6.
3rd root of 108a^3bc^2

This is what I did next...108a^1/3b^1/3c^2/3

Now what??