Assume that local average signal strength field measurements were made inside a building, and post processing revealed that the measured data fit a distance-dependent mean power law model having a log-normal distribution about the mean. Assume the mean power law was found to be Pr(d) ∝ d-3. If a signal of 1 mW was received at d0 = 1 m from the transmitter, and at a distance of 10 m, 10% of the measurements were stronger than –25 dBm, define the standard deviation, σ, for the path loss model at d = 10m.

a

step-by-step explanation:

when a number is between two straight lines it means the absolute value.

to find absolute value you need to know how many numbers is that number away from 0.

when finding absolute value the number will always come out positive

so absolute value of -3 is 3

absolute value of 3/2 is 3/2

absolute value of -2 is 2

absolute value of 3.5 is 3.5

absolute value of -1 is 1

now put these numbers in order:

a)   |-1|, |3/2|, |-2|, |-3|, |3.5|

x = 2

step-by-step explanation:

if sr parallel to ba then the sides bc and ac are in proportion, that is

= ← substitute values

= ( cross- multiply )

27x = 6(4x + 1)

27x = 24x + 6 ( subtract 24x from both sides )

3x = 6 ( divide both sides by 3 )

x = 2

the answer is z7+8/5