Point C is the midpoint of segment AB. Determine the coordinate of point B, if A (-3/10), C (9/10).

To solve this problem, you need to find the coordinates of point B. Based on the condition, we can understand that point C is the midpoint between points A and B. Therefore, the distance from A to B is 2 times the distance from A to C and vice versa. Relying on this data – the coordinates of point B will be equal:
x coordinate = 3 + 9 = 12 (minus goes away, since we count the distance from one point to another, and not relative to 0)
y coordinate = 0 (since Y from A and Y from B are equal to each other, hence the distance is zero)
Answer: B (12; 0)