Z>/=3 on number line and if there is an empty circle on the number line it means is not included in solution set and filled circle on number means that it is included in the solution set Z means

When we have an empty circle in a point, this means that the value of the point is not included.

This would be used for something like:

x > a

The value a is not a solution, because x needs to be larger than a, then we should use the empty circle.

A filled circle is used when the value is included in the solutions.

This is used for inequalities like:

x ≥ a

Where x = a is a possible solution.

Then if we have te set:

Z ≥ 3

We should have a filled circle at the value 3.

-18

step-by-step explanation:

because mean value defines that total sum value over total number of set

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2