Answer:
the answer is 20
Step-by-step explanation:
180+180=360
80+70=150
180-150=20
80% is the same as 4/5, so 4/5 of the class= 20. That means that if there was a picture, 4 parts would be shaded, and 1 would not. 1/4 of 20 is 5, so 1 part= 5 people. 5 x 5 = 25. 25 is the answer. :)
Answer:
10
Step-by-step explanation:
Step-by-step explanation:


= 2π(14).(14+29)
=2π .14.43


=3784 mm²