Answer:
AC and BC are or 4.24
Step-by-step explanation:
AC=BC and AB = 6 units
Let AC=BC=x units
Sum of 2 expressions
2/7 x -1 + 3/7 x +6
= 2/7 x + 3/7 x -1+ 6
= (2+3)/7 x -1+6
= 5x/7 +5
56.9
cos y = 6/11
y = cos‐¹ (6/11)
= 56.9
hope it helps!