exam Maths Puzzle Numerical Ability

Write each fraction in simplest form.
17/51

I never understood how to do these, help.

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exam Other Question

I am trying to figure out how to understand what d equals in the following formula:

ts-tp=d/vs-d/vp

Any assitance would be great.

Thanks in advance,
Scott When substituting for a variable in a function graph, how do I select the correct substitution for the variable.

Example: f(x)=-7(x)

When making a graph, I am not sure how to get the input, and output.