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19 words / 38 seconds = x words / 60 seconds 19 / 38 = x / 60 19 * 60 / 38 = x 30 = x 30 words.
They are marked by exactness and accuracy of expression or detail
if x=-1 and y=3, what is the value of the expression 3x3_2xy?
Fraction!
An "expression" is anything that can be calculated to get a number, in other words, anything that represents a number, so that includes the numbers themselves.