HELPOO

8. C=131.88 mm

9. C=40.82 ft

10. A=254.34 in²

Step-by-step explanation:

8. diameter of 42 millimeters- circumference?

Radius is half of 42, so 21 mm

Circumference=2πr

C=2π21

C=131.88 mm

9. diameter of 13 ft- circumference?

radius is half of 13, so 6.5

Circumference=2πr

C=2π6.5

C=40.82 ft

10. radius of 9 in- area?

Area=πr²

A=π9²

A=π81

A=254.34 in²

6, 10

9, -13

12, -21

18, -23

step-by-step explanation:

you just add 6 to the x-coordinate and subtract 10 from the y-coordinate.

1010: 3030

is it i think