exam Maths Puzzle Numerical Ability

I do not understand this?

Express 50(ten) in binary, trinary and base 4.

thankyou Danielle

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exam Other Question

Graph y=(x-5)(2x+7)(3-x)^2(x-7)(x+2)^2, and label all intercepts

ty how many permutations are there of the letters in the word "distinction"?