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r3t40

We know that the sum of all sides equals 74.

3y + 2y + 3 + y - 1 = 74

By collecting like terms this simplifies to:

6y = 72

Now just divide both sides by 6 to get:

y= 72/6 = 12

Now put y in BC formula y - 1:

BC = 12 - 1 = 11

The length of BC is 11.

Answer:

uhhh idek i just wanted points

Step-by-step explanation:

im just playing, its 11 i think

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