Across
1
Difference between highest and lowest values
4
Number with digits after a point
5
Rectangular array of numbers
6
U-shaped curve of a quadratic function
9
Part of a line with two endpoints
10
Rectangle with four equal sides
11
Value that does not change
Down
2
Number that divides evenly into another
3
The number representing nothing
7
Symbol representing unknown value
8
Part of a circle's circumference