Across
1
Symbol representing unknown value
2
Part of a line with two endpoints
4
Single numeral from 0 to 9
5
Steepness of a line
7
U-shaped curve of a quadratic function
8
Math using letters for unknown values
Down
2
System of ordered marks for measuring
3
Part of a circle's circumference
4
Line crossing from corner to corner
6
Result of raising a number to an exponent
9
Visual representation of data