What is always true about a linear pair? O A. The sum of angle measures is 180°.
B. Each angle measure is the same.
O C. The sum of angle measures is 90°.
D. The sum of angle measures is 360°.

O A. The sum of angle measures is 180°.

Step-by-step explanation:

A linear pair of angles are supplementary.

They must add up to 180°.

Linear pairs also would form a straight angle. A straight angle is 180°.

Hope this helps.

phosphate, calcium ion, chloride ion, neon atom

step-by-step explanation:

location: point 0

step-by-step explanation:

well, -8 to 10 on a number line is 18 spaces.

1/9 of 18 is 2.

so, 4/9 of 18 must be 8.

8 spaces from -8 (a) is 0.

so, 4/9 of the way from -8 to 10 is 0!