How many shirts do they have altogether Lee has 7x - 12 shirts and Bruce has
11x + 3 shirts. How many shirts do they
have altogether?

18x - 9

Step-by-step explanation:

D. Multiplication

Step-by-step explanation:

Multiplication is a term with origin in Latin multiplicatio that allows to name the fact and the consequences of multiplying or multiplying (increase the number of things that belong to the same group).

For mathematics, multiplication consists of a composition operation that repeatedly requires adding a number according to the number of times indicated by another.

The numbers involved in multiplication are called factors, while the result is called product. The objective of the operation, therefore, is to find the product of two factors.

Each factor, on the other hand, has its own denomination: the number to be added repeatedly is the multiplying, while the number that indicates the number of times to multiply is the multiplier. In short, multiplication consists in taking the multiplication and adding it as many times as units the multiplier contains.

In this case:

C^2 * D^3

where

* is the mathematical expression to multiply, also symbolized as x

C^2 and D^3 are the factors