exam Maths Puzzle Numerical Ability

I cannot figure out how to get rid of the radical as the denominator....

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exam Other Question

What is the amplitude, period and phase shiftbof the following functions

1) y= - 3 sin 1/3x

2) y= cos 4(x-pi/3)

3) y= tan (3x - pi/2)

4) y= 5sin((pi)x-pi/2)
I need to know how to solve the equation using the distributive property.
7(6-y) = -3(y-2)