Answer:
10
Step-by-step explanation:
x = 10, -15
The common ratio is -5, note that each value is the previous value multiplied by -5.
Step-by-step explanation:
relation 1: x=-6
relation 2:y =-9
It's False; an octagon has 8 vertices. When you remove the starting vertex and the two adjacent vertices we're left with 5 possible diagonals