the difference between variables (m), variable expression (problem with variable in it), number expression (problem with only numbers in it)
can't use x for multiplication anymore. use a dot or star.
Evaluation Expression = do the math
Steps to find out variable expression
identify variables, example: 27y = 27(3)
evaluation expression
area of a triangle
B=base=5cm, height=H=4cm
B*H/2=
5*4/2=
representing situations with integers
lose $7.00 = -7
8 steps forward = 8
easy way to do it:
___ ._________.__.__.__
-4 -3 -2 -1 0 1 2 3 4
Greatest to least: -3, 2,3 and 4
Vocab:
Absolute value
Definition: a numbers distance from zero on the number line.
examples: /-9\ = 9 spaces
/-6\ = 6
easy mistakes:
/9\ = -9 NOT the opposite
simple definition:
opposites have same absolute value
Opposite:
Definition: Numbers that are the same distance from zero on the number line, but in the opposites directions
examples:
-2 and 2
-13 and 13
-0.7 and 0.7
easy mistakes:
10 and -5
8 and 8
These are not examples of opposites.
Integers
Definition: The whole numbers and their opposites
whole numbers are 0,1,2, ..
Examples:
6 , -7, 14, 0, -352
easy mistakes:
Miss-spelling the word interger
Other examples of easy mistakes: 1/2, infinity, pi, 0.75
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