variable expression, I believe.
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In programming: They let you do generic calculations, with numbers that you don't know in advance. In algebra: They let you do calculations with unknown values - either generic calculations, or do calculations to find such unknown values in a specific case.
algebraic expression consists of numbers and operations
All expressions combine numbers and operations!
Arabic numbers need less digits to represent large numbers (in general). When doing arithmetic operations on the numbers, Arabic is easier because of the place values can line up.
What are the 4 Fundamental Operations in decimals