If what you mean is what does x equal then X=30
Answer:

Step-by-step explanation:
Given
-- degree of freedom

Required
Determine the t-value
The given parameters can be illustrated as follows:

Where

So, we have:

To solve further, we make use of the attached the student's t distribution table.
From the attached table,
The t-value is given at the row with df = 28 and
is 3.673900
Hence, 
Answer:
21.43 mph
Step-by-step explanation:
:)
Answer:
Angle IEF = Angle CEH ( corresponding)
Therefore Angle CEH = 96°