Step-by-step explanation:

or equivalently

We often write variable side-byside without the multiplication sign in algebra. It also applies to terms with indices. For instance,

We may, often also add a dot at the middle of both terms as another version of multiplication sign for better readability if the terms are more complicated, for instance

and

Answer:
Cement costs vary from approximately $50 to $75 per ton or 2.5 to 3.75 cents per pound.
Step-by-step explanation:
Statement Reason
1.
Given
2.
Distributive property of multiplication over addition
Let 'a', 'b' and 'c' be any real numbers. So, Distributive property of multiplication over addition states a(b+c) = ab + ac
3.
Subtraction property of order
4.
Addition property of equality
The addition property of equality states that if the same number is added to both sides of an equation, then the equation is still true.
5. x<1 Division property of equality
The Division Property of Equality states that if you divide both sides of an equation by the same nonzero number, the equation remain equal.
it's addition i looked it up