6. simplify the following expression by combining (adding together what is alike) like terms:
8n + 5 - n + 13
*
9n + 18
13n + 12
25n
7n + 18

7. what is the domain (the first element or number, from each pair) of this relation:
{ (4,1), (5,2), (6,-1), (8,5) }
*
{4, 5, 6, 8}
{4, 5, 6}
{-1, 2, -1, 5}
{4, -1, 5, 2}

8. on a number line, which are greater: *

absolute numbers
negative numbers
positive numbers
no numbers

option a.

step-by-step explanation:

if you look closely at the graph, we can notice that the function is not defined at two different points.

if you look at functions b and c, you will notice that both functions are not defined at just one point. the function b is not defined at x= -5/2 and function c is not defined at x=-5. both options are discarded, given that our function should not be defined at two fiferent points.

now, if you look closely at the graph you will notice that the function sketched is not defined at x=5 and x=-2.

0.85 or 85%

step-by-step explanation:

1) divide 23 by 27

2) round the decimal to the nearest 10

3) so your answer would be 0.85 or 85%