Answer:
75.4
Step-by-step explanation:
Answer:
See the diagram.
Step-by-step explanation:
represents a circular disc with centre 
and radius 
I think A sorry if I'm wrong I'm not to good at math
Answer:
40
Step-by-step explanation:
5 people in the room have 5*40 = 200 years altogether
a new person is X years old.
Now 6 people have (200 + x) years altogether.
Mean age of 6 people is (200+x)/6. and it is also = 40.
So,
(200+x)/6 = 40
200 + x = 240
x = 40
D.) 52%, this is because there are 11 odd numbers for 1 to 21, so the fraction is 11/21, which is approximately 52%
