Write an expansion that can be used to find 4 x 275 using mental math properties of numbers

56

Step-by-step explanation:

5x - 5 = 56        Set AC equal to EC since they are congruent

    + 5   + 5        Add 5 to both sides

5x = 61               Divide both sides by 5

x = 12.2

Plug this back into the original equation

5(12.2) - 5 = 56

61 - 5 = 56

56 = 56

The measure of AC is 56.

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