Answer:
The answer would be 'D'.
Step-by-step explanation:
An expression does NOT have an equal sign while a formula does. A variable is some letter symbol that you are solving for, but a constant would be a number such as 2 or 4 that could be added, multiplied, subtracted, or divided in an equation.
I hope this helps!
a formula
x = 14
m∠A = 38°
m∠C = 71°
m∠D = 71°
