Answer:
6.) 13 > c; open; left
7.) -9 < s; open; right
8.) 16 [tex]\geq[/tex] j; closed; left
9.) -16 [tex]\leq[/tex] z; closed; right
10.) 18 < w; open; right
Explanation:
Open (exclusive) whenever the sign is > and <. Closed (inclusive) whenever the sign is [tex]\geq[/tex] and [tex]\leq[/tex]. Goes to the left if the letter has the less than(#>c, c<#) or the less than and equal to(#[tex]\geq[/tex]c, c[tex]\leq[/tex]#) sign points towards it. Goes to the right if the letter has the greater than(#<c, c>#) or the greater than and equal to(#[tex]\leq[/tex]c, c[tex]\geq[/tex]#) sign points towards it. For the first part of the the questions just move all of the numbers to one side and the variables to the other.
