Please help me on these two questions

Question 8.)  Choice d.)  4 + x + 6x  = 4 + 7x

Question 9.) Choice b.)  18 - 15 + 4n + 5n  simplifies to  9n + 3

Step-by-step explanation:

For the first question, like terms are terms that have the same variables, and not necessarily the same coefficient numbers.

first problem,    x + y + xy  all have unique terms.  x  is different from y and is different from xy

so it cannot be A.

Choice d. has like terms  x and 6x  so  4 + x + 6x can simplify to 4 + 7x

Choice b.)  18 - 15 + 4n + 5n  simplifies to  9n + 3

this was already solved by me with a different person. if you look it up in the search bar at the top of the page, you will get the answer.

step-by-step explanation:

i do not know the answer

step-by-step explanation: