exam Maths Puzzle Numerical Ability

Find each product (y-3)(yt5)=y(y) t y(3) ty(y) ty(5)=y2 t y-3 t y2 t y5= y4 t y2 did I do this problem correctly?

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exam Other Question

Given the equation for the circle with center C(3,-2) and radius 4. I came up with (x-3)^2+(y+2)^2=16, take a look for me to see If I did this one right or not. thanks for checking it for me. 2x+2y=5
y=1/4x