Consider the following sets

U = {all real numbers points on a number line}
A = { solutions to the inequality 3x +4 greater than equal to 13}
B = { solutions to the inequality 1/2x +3 less than equal to 4}

For which values of x is A U B = ø?

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)