**Answer:**

m = -3

**Step-by-step explanation:**

-2m=6

**Divide both sides by (-2). **

m = 6 ÷ (-2)

m = -3

**Answer:**

They are congruent, SAS, hope am right, wasn't sure about this

**Answer:**

50.8 centimeters

**Step-by-step explanation:**

So, if Shannon's chair is 20 inches tall, you would multiply that by 2.54 in order to get the length in centimeters.

20 x 2.54 = 50.8.

So Shannon's char is 50.8 centimeters tall.