Plumber has a 9/4 metre length of the copper piping.(a)he uses 2/3 of this for a job. what length of pipe is left

Find the value of 1715⋅211.though these numbers aren't quite as nice as the ones from the example or the previous part, the procedure is the same, so this is really no more difficult. give the numerator followed by the denominator, separated by a comma.

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!