Given:
n = 27, sample size
df = n-1 = 26, degrees of freedom
xb = 11.8, sample mean
s = 2.3, sample standard deviation.
Because population statistics are not known, we should use the Student's t-distribution.
At 99% confidence interval, the t-value = 2.779 (from tables).
The confidence interval is
11.8 +/- 2.779*(2.3/√(27)) = 11.8 +/- 1.23 = (10.57, 13.03)
Answer: (10.6, 13.0) to the nearest tenth
So if 1in = 15 mi you just multiply each number by 15 to find the number of miles
55) 30 mi
56) 22.5 mi
57) 7.5 mi
58) 48.75 mi
59) 82.5 mi
60) 108.75 mi
103.468L rounded to the nearest liter would be 103L
Given

I attached a graphical solution to the equation. The blue curve represent

while the red curve represent

From the equation, it can be seen that the curves representing the two terms in both sides of the equation does not meet.
Therefore, the statement about the graph that is true is "The curves do not intersect".