4x + 12 < 60
3x + 12 < 20
26-12 = 14
A dozen = 12 one fewer = 11 12-1 = 11
x + 12 = -12
4x + 12 < 60
To get three more than a number, add there. If the number is n, then three more than n is n + 3.
4n-12
As an algebraic expression it is: 4i-12
Carbon - 14 has two more electrons than carbon - 12.
34,24,23,14,13, or even 12.
The element described has more valence electrons than oxygen but fewer than neon, more protons than sodium but fewer than argon. This element is magnesium, which has 12 protons, 12 valence electrons (2 more than oxygen but 2 less than neon), and is situated between sodium and argon on the periodic table.
12-
3x + 12 < 20
12 more than a number means: __+12 (a number plus 12). You can express this as an algebraic expression: n+12 or 12+n(n representing a number.)
26-12 = 14
The element in question is magnesium. It has 12 protons (more than sodium and less than argon), 2 more valence electrons than oxygen (which has 6), and 8 fewer valence electrons than neon (which has a full valence shell with 8 electrons).