exam Maths Puzzle Numerical Ability

Can you please tell me what values are excluded from the domain of this function: f(x)= 3x+2 ? Thanks!

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exam Other Question

A life saver has a 3cm diameter, a 1cm diamter hole and has 1/2 cm height. Find the volume and total surface area of the life saver. (Just like the candy lifesaver) That is what the pic looks like.

Thankyou Shelly find the perimeter of a rectangle that measures 12 inches by 20 inches