9 foot because it stated that 1 in. = 1 foot
Answer:
- <u><em>See the law and the hypothetical example below.</em></u>
Explanation:
The <em>index law</em> that you are dealing with is:

It is used when you have the quotient of powers with the same base.
To show you how to use that rule, let's work an example
Simplify:

Factor 9 as 3² and 6 as 2×3:

Group the factor with equal base:

Use the index law:

Note that it was used an additional rule: 
Thus, 
Answer:
The similarity is they are using tools to help them make the lines, but the differences are they are using different tools to make different lines. While 1 of the tools is similar to the other
Step-by-step explanation:
check the picture below.
make sure your calculator is in Degree mode.
The measure of angle 1 is 210 degrees.
You'll have to draw an auxiliary line in between the two parallel lines.
Then, you'll have to find out the angle measures next to 100 and next to 50. Since a line is 180°, then the angle measures next to 100 and 50 are 80 and 130 respectively.
Then, since you have an auxiliary line, you can use the rule of alternate interior angles of parallel lines being equal.
Then from there just add up 80 and 130 to get you 210.