exam Maths Puzzle Numerical Ability

What is the domain of the function of f(x)= square root of (x+1)?

What is the equation for this problem?

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exam Other Question

Hi, I have to suppose the vertex of the parabola y=3x^2-6x+k is (1,2) I have to find k.
I have substituted x=1 and y=2 into the equation and got
2=3(1)^2 - 6(1) +k
2= 3-6+k
2-3+6=k
k=5
Is this right??? thanks. The sum of four consecutive even integers is 308. Write and solve an equation
to find the four integers.