Across
1
Symbol representing unknown value
4
Corner point of a polygon
7
Result of raising a number to an exponent
8
Single numeral from 0 to 9
11
U-shaped curve of a quadratic function
Down
2
Power to which a number is raised
3
Rectangular array of numbers
5
Number with digits after a point
6
Middle value in an ordered dataset
9
Number divisible only by 1 and itself
10
Line crossing from corner to corner
12
Number less than zero