I think that the answer is A, because in the range, none of the numbers should be the same, and the numbers are all different in choice A
A/3=7/10
21=10a
a=2.1
100a=100*2.1=210
Answer:
Radius, r, is 3.75
Step-by-step explanation:
From the given diagram,
AB = 9
AC = 6 + r
BC = r
Thus applying the Pythagoras theorem, we have;
=
+ 
=
+ 
36 + 12r +
= 81 + 
collecting like terms,
12r = 81 - 36
12r = 45
r = 
= 3.75
r = 3.75
The radius is 3.75.
3 is in the hundred millions