What is the purpose of the anecdote with which David Foster Wallace opens the speech? What is the effect of his returning to the line "This is water" again near the end of the speech and repeating it there?

answer; ///(a)//the death of his

this is the answer , p = 1 + (1/10)x

step-by-step explanation:

we have,

at sea level pressure is 1 atmosphere (i.e at x =0, p0=1 atmosphere)

at depth 23 meters , pressure = 3.3 atmosphere

since the pressure increases at constant rate as the depth increases, so we can write a relation as:

p =p0 +   kx   , where p is the pressure  , p0 is the initial pressure, x is the depth and k is constant rate of increasing.

to find constant rate k, plug p = 3.3 , p0 = 1 and x= 23 meters

we get,

  3.3 = 1 + k * 23

k = 2.3 / 23   = 1/10

so we can write the function formula as:   p = 1 + (1/10)x

it took the same time to travel by as it did on   train : ) hope i

i would say a because the main idea is what the author is the point the author is trying to get across.