50 points.
Find the area of the shaded regions:

18 pi cm^2

18 (3.14) =56.52 cm^2

or use the pi button 56.54866776 cm^2

Step-by-step explanation:

First find the area of the entire circle

A = pi r^2

A = pi 9^2

A = 81 pi

The area of a circle is 360 degrees.  The shaded area is 80 degrees

Take the fraction of the circle that is shaded and multiply by the total area

80/360 * 81 pi

2/9 * 81 pi

18 pi

We can approximate pi

18 (3.14) =56.52

or use the pi button

56.54866776

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

happy to

pls mark as brainliest.

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870