[MA2019] (6) 15 :
15. Write, read, and evaluate expressions in which letters represent numbers in real-world contexts.
a. Interpret a variable as an unknown value for any number in a specified set, depending on the context.
b. Write expressions to represent verbal statements and real-world scenarios.
c. Identify parts of an expression using mathematical terms such as sum, term, product, factor, quotient, and coefficient.
d. Evaluate expressions (which may include absolute value and whole number exponents) with respect to order of operations. [MA2015] (6) 17 :
17 ) Use variables to represent numbers, and write expressions when solving a real-world or mathematical problem; understand that a variable can represent an unknown number or, depending on the purpose at hand, any number in a specified set. [6-EE6]