What does the following expression means 2m+7

A mathematical expression can be represented in different ways, for instance, with the use of numbers, variables and operators ( +, -, *, /) or with by using the phrases in any language.

The expression given here i.e. 2m + 7, can also be translated to different phrases in English like:

Seven more than twice a number m

Or

Twice a number m is added to seven

Or

Double the number m plus seven

answer:

c. the third graph

it would be 6xy and -16xy.