What is the radius of this circle if the circumference is 18π cm?
3 cm 9 cm 18 cm 36 cm

The radius is 9 cm.

Step-by-step explanation:

The formula for calculating the circumference of a circle is

Where r is the radius and C is the circumference.

It was given in the question that; the circumference, .

We substitute this into the formula to obtain;

Divide both sides by

The radius is 9cm

arithmetic sequence

step-by-step explanation:

given that a sequence has terms as

19, 15, 11,

this is represented on a graph

the pattern indicates that the sequence is an arithmetic sequence with i term

a=19 and common difference d =-4

any general term

thus the sequence is reduced by 4 for each successive term starting from 1 and nth term is

24-5n.

first negative term would start after 5th term

5th term =24-25< 0

from 5th term onwards the sequence would be negative.