Help me with this question please lol.

Step-by-step explanation:

B. 21 because the y is going up 21 every 1 of x. That’s a bad explanation. It’s like 21x1= 21.

21x2=42 etc so ya going up 21.

21

Step-by-step explanation:

Have a phd in mathematics :)

12 units

Step-by-step explanation:

A6B?C

Midpoint is center that divides the line segment into two equal halves.

∴    AB = BC

If line AB measures 6 units in length, then, line BC will measure 6 units in length.

     AB = BC = 6 units

     AC = AB + BC

     AC = 6 units + 6 units

     AC = 12 units

OR

We can say If B is the midpoint of AC, then AC is twice as long as AB.

     AC = 2AB

     AC = 2 × 6 units

     AC = 12 units        

Therefore, the length of line AC is 12 units.