A number which has more than two factors is called composite number. Factors of 18 are 1, 2, 3, 6, 9 and 18. As it can be seen 18 has more than two factors so, 18 is composite.
18
x+9=18 x = 9
The certain number is 18.
The number is 18 because 2*(18)+6 = 42
22
The number 68.
Let x = the number Equation: x = 18 + 1 Therefore, x=19
6+2x=18 x=6
let n=the number n+18
5x + 18 = 2x - 6 x = -8
No, chlorine has more protons than argon. Argon has 18 protons, while chlorine has 17 protons.