6 Two circles have circumferences of 10 cm
and 12 cm. What is the difference in their
radii?
7 A chord of a circle subtends an angle of 60°
at the centre of a circle of radius 7 cm. Find
the perimeter of the minor segment of the
circle.
8 A piece of thread was wound tightly round a
cylinder for 20 complete turns. The thread
was found to be 3.96 m long. Calculate the
diameter of the cylinder in cm.
9 Calculate the perimeter of a sector of a circle
of radius 27 cm, the angle of the sector being
140°.

i think it's b

step-by-step explanation:

because the graph is 2 above (0,0)

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative