What communication channel would be most appropriate when a written record or formality is required?

B). Letter.

Explanation:

A variety of communication channels are employed as the manner in which a message is transferred or delivered from one individual to another individual or group.

As per the question, in order to convey a written and formal record to a person or authority, 'letters must be used' as they contain specific information in a precise, sophisticated, and notable form. The other channels are employed for distinct purposes like 'reports intend to present data' while 'e-mails help in providing reaction or feedback' instantly and 'blogs proffer the digital particulars to the readers'. Therefore, option B is the correct answer.

it should be repealed cuase its not fair

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