the value of a coordinate on the horizontal (x) axis
the positive number that describes the distance on a number line of the graph of the number from zero
an angle whose value is between 0 and 90 degrees
a triangle in which all the angles are acute
a number that is added to another number
the operation of combining two numbers to form a sum
for any nonzero real number, the opposite of the number
additive property of inequality
for any real numbers a, b, and c, if a is greater then b,
then a + c is greater than b + c and c + a is greater than c + b
constants and/or variables combined using the arithmetic operators +, -, ×, or ÷
a meaningful arrangement of numbers and variables
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