Ms. Yost has 20 boxes of markers. She buys 420% more boxes. How many boxes will she have in all?

Ms. Yost has 20 boxes of markers. She buys 420% more boxes. How many boxes will she have in all?

Step-by-step explanation:

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

∠cbe and ∠deb are same-side interior angles.

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