Answer:
25 units
Explanation:
Since angle B and angle C are the same, that means triangle ABC is an isosceles triangle and sides AB and AC are the same length. So we have
4x + 1 = 2x + 23
2x = 22
x = 11
And so subbing in 11 for x in 3x - 8
3x - 8
= 3(11) - 8
= 33 - 8
= 25
So BC is 25 units