Read this excerpt from Susan Butcher and the Iditarod Trail.

Which prediction is best supported by a detail in the

excerpt?

But the only really effective way to stop an epidemic

from spreading through the entire town was to

vaccinate people against it. The doctor had a small

amount of vaccine, or serum, but it was five years old

possibly useless—and would not go far. He must find

more.

The townspeople will not agree to be vaccinated

O The doctor will invent a serum to fight the disease.

O The disease will surprise everyone by not

spreading

The doctor will look for ways to obtain more serum.

D, The doctor will look for ways to obtain more serum.

Explanation: Well first, I've read the story, so I know what happens next. Second, I've taken the quiz, and I recall choosing "the doctor will look for more ways to obtain more serum" and getting it right. Third, the other answers just don't make as much sense as this one.

thousands of people

explanation:

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