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Some of the earliest forms of customer service is goods and services would come to you. Peddlers went to houses, doctors did hours calls...etc
Answer:

Explanation:
The speed of the sound wave is:


The frequency is:



Answer:
Oil need for supply = 9,660,000 liters
Explanation:
Given:
Number of animal = 3,000
Per animal eat = 2.3 kg per day
Number of days = 7
oil need 2 liter per 10 grams of corn
Find:
Oil need for supply
Computation:
Oil need for 1 kg of corn = 200 liter
Amount of corn = 3,000 × 2.3 × 7
Amount of corn = 48,300 kg
Oil need for supply = 48,300 × 200
Oil need for supply = 9,660,000 liters
The suspension system
keeps the vehicle's tires in contact with the road.
<u>Explanation:</u>
The suspension system that is present in a car comprises of springs and shock absorbents. This system helps in absorbing the road bumps as result of it so won’t feel them as much.
This system also helps in keeping the tires in contact with the road irrespective of the driving conditions. It comprises of tires, shock absorbents, struts, springs, arms, linkages, bars, bushings, and joints. The components are placed between the frame of the road and the vehicle.