Across
1
Steepness of a line
3
Reference line in a graph
4
Difference between highest and lowest values
5
Power to which a number is raised
8
Symbol representing unknown value
9
Rectangular array of numbers
10
The number representing nothing
Down
2
Longest side of a right triangle
3
Space between two intersecting lines
4
Comparison of two quantities
5
Divisible by two
6
Number greater than zero
7
Single numeral from 0 to 9