Across
1
Number divisible only by 1 and itself
4
Symbol representing unknown value
5
Line touching circle at one point
6
Steepness of a line
8
Rectangular array of numbers
9
Reference line in a graph
Down
1
U-shaped curve of a quadratic function
2
Number that divides evenly into another
3
Collection of distinct elements
7
Amount of space an object occupies
10
Single numeral from 0 to 9
11
Rectangle with four equal sides