Answer:
its 100 !!
Step-by-step explanation:
^-^
100
PEMDAS
P (10-7) = 3
M (3)4 = 12
A 25+12+63 = 100
15pi/60 = pi/4 hopefully this helps :)
Angle in radians = arc / radius
15pi/60 = pi/4
35 books
40*3=120
120-85=35