Answer:
t
Step-by-step explanation:
Label the books returned "b", and the books sold on monday "m", and the books sold on tuesday "t", and the books returned "r".
the formula:

(you can remove the brackets)
Y+y+17+111+90=360
2y+128+90=360
2y=360-218
2y=142
y=142/2
y=71
thus, the angles are 71, 90, 111, 88.
Answer:
3,4,5
Step-by-step explanation:
All you have to do is use the Triangle Inequality Theorem, which states that the sum of two side lengths of a triangle is always greater than the third side. If this is true for all three combinations of added side lengths, then you will have a triangle therefore 3,4,5 is not triangle.
Hope this helps but I think the answer could be : 157+25m=50+60m