Explain what the variable represents in a addition or subtraction expression

How to write 3 tenths and 5 tenths as a decimal

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

The transitive property of equality states that: o if a = b, then bra o if a = b, then ac = bc o if a = b and b= c, then a = if a = b and c= c, then a + b = b + c