11. 9/20
12. 13/20
13. 12/20
that's if it doesn't have to be in percentage form
Formula is y = mx + b
Answer y = - 2/3x - 3
21 they have too be right next to each other and threy have too be right
First term (a1) is -1
recursive formula goes like this

is the nth term

is the term before that
we normally have

we see each term is multipying by -3 to get next one
so that would be

where a1=-1
the 3rd option is correct except that it is the explicit formula
so answer is 2nd one
Answer:
61
Step-by-step explanation: