exam Maths Puzzle Numerical Ability

Divide and simplify
7v-35/25 divided by v-5/15v
I know I have to make it multiplication by using the resiprical
7v-35/25*15v/v-5
(7v-35)(15v)/25(v-5)
Now I believe I have to f

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exam Other Question

State the domain of the following
Question 1

a) f(x)=suareroot x+4

b) g(x)= 2x+1/x-3

c) h(x)= 3x^2+5x-3

d) l(x)= 2x+3

m(x)= 3/x^2+7 31.) (a+3i)+(2+bi)=i

33.) (5-the square root of -4)-(a+bi)=6

I know how to do the problems that do not have an equal to (ie =i or =6) but I do not understand how to do these. Please help