There are 85 telephones in the editorial department of glencoe publishing company. how many 2- way connections can be made among the office phones?

All of the telephones * all of the telephones minus one (because one is in use)

85 * 84 = 7140 connections

the answer is:

the correct option:

b.

to solve the problem, we need to remember how to operate to simplify exponential expressions using the logarithms.

we are given the equation:

then, using placing logarith with base 7 on both sides of the equation, we have:

so, rounding the obtained result to two decimal places (nearest hundreth), we have:

hence, we have that the correct option:

b.

have a nice day!