Across
1
Symbol representing unknown value
2
Number divisible only by 1 and itself
5
Single numeral from 0 to 9
6
Middle value in an ordered dataset
8
Steepness of a line
Down
2
Result of raising a number to an exponent
3
Power to which a number is raised
4
Difference between highest and lowest values
7
Number with digits after a point
9
Number less than zero
10
Longest side of a right triangle