exam Maths Puzzle Numerical Ability

I want to know if this problem is correct:

(y-2/3)^2 = 49

y - 2/3 = + or - Square root 2/3

If y - 2/3 = 2/3 then y = 4/3

If y - 2/3 = -2/3 then y = 0

Is this solution correct the way it is worked out?

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exam Other Question

Lorijayne smiled, for she had purchased C cats for only D dollars. Then she frowned, for she still had to purchase P parrots and each parrot cost (7/4) of the cost of 1 cat. How much did she pay for her parrots? What is the domain of the following:
f(t)= log(t-5)
g(x)=5e^x
g(t)=ln(t+4)
g(t)=5^t