Picture attached below
x =

82
98
262

x=82°

Step-by-step explanation:

1. The figure attached shows an inscribed quadrilateral, this means that the  vertices lie on the circle.

2. By definition, the sum of the opposite angles of an inscribed quadrilateral is 180°.

3. Then keeping this on mind, you can calculate the measure of x as following:

Solve for x:

4. Therefore, the answer is the first option.

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

ok

step-by-step explanation: