Across
1
Single numeral from 0 to 9
2
U-shaped curve of a quadratic function
4
Steepness of a line
6
Part of a circle's circumference
8
Difference between highest and lowest values
Down
2
Number greater than zero
3
Comparison of two quantities
4
System of ordered marks for measuring
5
Mathematical rule or equation
7
Closed shape with straight sides