Answer:
A ). 12
Step-by-step explanation:
The model is 3 inches, since 3 times 3 is 9 and 1 times 3 is 3.
Answer:

Step-by-step explanation:
To find this derivative, we will need to use the chain rule.
As there is a variable in the exponent we can use this formula:

In this case,
and 
This means that
and
respectively
This gives us 
Step-by-step explanation:
1 act like the decimals aren't there then put 50:1 on the outside and 6630 on the inside and divide like normal