Examlex
Which of the following is NOT a natural source of caffeine?
X
Often used to represent an unknown value in algebraic expressions and equations.
Inches
A unit of length in the imperial and US customary systems, equivalent to 1/12 of a foot.
Perimeter
The total distance around the edge of a two-dimensional shape, calculated by adding together the lengths of all the sides.
Length
The measurement of something from end to end or along its longest side.
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