Basically, the question is asking, what will happen if we increase 9 by 30%?
first, what is 30% of 9?

So, the increase will be by 2.7 days,
So the total amount will be 9+2.7=11.7 - this is the correct answer.
Width = x
Length = 3x
Perimeter = x + x + 3x + 3x = 8x
He walked 3 rounds
3 x 8x = 24x
Total distance walked = 5280 feet
24x = 5280
x = 220
Shortest side is 220 feet
Well, $107 times 7 is $749, is that what ypu needed?
Y = 4/7x - 30/7
This is the equation you can obtain by using the slope and the point and solving y = mx + b for b. Then sub the slope and intercept into the equation.