"X" in Roman numerals is 10.
Roman Numeral Chart
I=1
V=5
X=10
L=50
C=100
D=500
M=1000
10 is equal to X in roman numerals
XL
50 Roman numerical values: M=1000, D=500, C=100, L=50, X=10, V=5, I=1
xxvi-x-mmiv
20
Hindu-Arabic numerical system is what we use today i.e. 0 1 2 3 4 5 6 7 8 and 9 Roman numerical system was once used in the past i.e. I V X L C D and M
The numerical coeffecient of -x is -1.
x2 - 81y2 = (x + 9y) (x - 9y)The actual numerical value depends on the values of 'x' and 'y'.
In Roman numerals the numerical value is 3000
VII
Numerical system of the Roman Empire
The basic symbols are I,X,L,C,D&M