18) In this problem they are telling you that the cost of the gifts are given by the equation:
![5g+15=140](https://img.qammunity.org/2023/formulas/mathematics/college/arxs7kuk9nujy47fd2uju66eaaqypjzdgx.png)
So to know the cost of each gift we can solve for g so:
![\begin{gathered} g=(140-15)/(5) \\ g=25 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/6bete7635pqpxmsaa5uf9v4ushcna9g2ol.png)
So he has 25 gifts for each gift. So is B.
19) now the expression that represent the number of games is:
![4x-3=y](https://img.qammunity.org/2023/formulas/mathematics/college/pjw134omm073o0wujn20u4pmxeqkigjy9a.png)
So the correct expression is:
A) Lori owns 3 less games than 4 times the number of games that have nathan.