free monitoring tools are useful for:
a. calculating customer satisfaction kpi formulas.
b. qualitative measurements.
c. observing what people are saying about a brand.
d. evaluating the effectiveness of social media tactics.
e. measuring branding efforts.

c.observing what people are saying about a brand

Explanation:

Monitoring tool systems are used to keep track of the system's condition constantly, with the goal of early warning against and strengthening errors, defects or issues. The computer, network, storage, health, results, website and Internet use and applications are controlled.

therefore, Free monitoring tools are useful for observing what people are saying about a brand.

Monthly energy cost = $47.52

Explanation:

Given the following data;

Voltage = 120 Volts

Current = 8 Ampere

Time = 15 hours

Energy cost = $0.11/KWh

To find the energy cost for a month;

First of all, we would determine the power rating of the microwave oven.

Power = current * voltage

Power = 8 * 120

Power = 960 Watts

Next, we find the amount of energy consumed;

Energy = power * time

Energy = 960 * 15

Energy = 14400 Watt-hour

To kilowatt per hour, we have;

Energy = 14400/1000 = 14.4 KWh

Now, we determine the monthly energy cost;

Daily energy cost = Energy consumption * cost

Daily energy cost = 14.4 * 0.11

Daily energy cost = $1.584

Therefore, monthly energy cost = 1.584 * 30

Monthly energy cost = $47.52

Or

Monthly energy cost = 14.4 * 0.11 * 30

Monthly energy cost = $47.52