Across
1
Sum divided by count
4
Power to which a number is raised
7
System of ordered marks for measuring
8
Math using letters for unknown values
9
Difference between highest and lowest values
10
Proven mathematical statement
Down
2
Steepness of a line
3
Closed shape with straight sides
5
Exact correspondence on both sides
6
Number greater than zero
11
Space between two intersecting lines