Write the following as an algebraic equation. Use x as the unknov and use a sum.
The sum of a number and 38.9 is 45.5

The unknown value of x is 6.6

Step-by-step explanation:

38.9 + x = 45.5

x = 45.5 - 38.9

x = 6.6

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true