10^2 -4^2 = x^2
100 -16 = x^2
84= x^2
Find the square root of 84 which is approximately 9.2
The answer is 9.2
You can give me the choices, are there even any?
Let g be the number of grandchildren, and d be the number of dogs. They both have only one head, so the number of heads is

Grandchildren have 2 legs, while dogs have 4. So, the total number of legs is

From the first equation (the one for the heads) we can derive

Substitute this into the second to get

So, there are 9 dogs and (from the first equation
