Question

What’s the awnser to this please

Answer 1

BC=6

Explanation:

The perimeter is the sum of all the side lengths.

Thus, add up all the sides.

And we already know the perimeter is 64. Thus:

`(3z)+(10)+(z-1)+(2z+3)+(10)=64`

Combine like terms and add the numbers:

`6z+22=64`

Subtract 22 from both sides:

`6z=42`

Divide by 6:

`z=7`

So, z is 7.

BC is z-1. Therefore:

`BC=z-1\\BC=7-1=6`

So, BC is 6.