Across
1
Math using letters for unknown values
5
Middle value in an ordered dataset
6
Number greater than zero
9
Reference line in a graph
12
The number representing nothing
Down
2
Difference between highest and lowest values
3
Rectangular array of numbers
4
Proven mathematical statement
6
U-shaped curve of a quadratic function
7
Steepness of a line
8
Rectangle with four equal sides
10
Amount of space an object occupies
11
Comparison of two quantities