Given :
∠ABF = ( 7x + 20 )°
∠FBC=(2x - 5)°
∠ABC= 159°
To Find :
The value of x .
Solution :
Assuming B the center of a circle .
So , all three given angles must be added to 360° .

Therefore , the value of x is 20.67° .
Hence , this is the required solution .
19 ÷ 25= 0.76
0.76 ⇒ 76%
She got a C on the test.
Hoped this helped.
~Bob Ross®
I think that she would need 5 medium boxes because
3 large = 300 beads
5 medium= 50 beads
5 small = 05 beads
that all = 355 beads in total