Solve 10, 11 and 12. will give brainliest to the first answer. plz show work. : )

10.

3x = 21

Divide by 3

x = 7

11.

7x = 63

Divide by 7

x = 9

12.

This question is different.

The LCM of 10 and 5 is NOT 50.

The LCM is actually 10, as 5 * 2 = 10.

arc length = 6.63311 ft.

step-by-step explanation:

the formula the arc measure is:

arc length s=2πr(c)/360

where:

c   is the central angle of the arc in degrees

r   is the radius of the arc

π   is pi, approximately 3.142

using the above formula we get

s =

thus we find that arc length of an arc for a circle of radius 20 feet and central angle 19 degrees is

6.63311 feet