Answer:
45 km/hr
Explanation:
total distance = 90
Increased speed = x+15
90/x - 90/x+15=1/2
90(1/x - 1/x+15)=1/2
90(x+15-x/x^2+15x)=1/2
equation is:
x^2+15x-2700=0
x^2+60x-45x-2700=0
x(x+60)-45(x+60)=0
(x+60)(x-45)=0
x= -60, x=45
reject the negative value = -60
usual speed=45 km/ hr
<span>has been encoded during unusually high levels of stress</span>
Answer:
I think that answer help u
1. D. Axum
Axum is located in what is now Ethiopia, and was founded by Arabs combining Arabic and African cultures. Axum owed its prosperity to its location along the Red Sea, on the trade route between India and the Mediterranean. Axum exported ivory, incense, myrrh, and slaves. It imported textiles, metal goods, wine, and olive oil.
2. A: Arabic was the main language used when trading with other societies.
Although Arabic was the most common language used in trade, others were used as well, particularly Swahili. In everyday life West Africa had enormous linguistic variety.
A college student interrupts the instructor during a seminar; the instructor responds with an angry glare. This is an example of: Informal Social Control.
<h3>
What do you mean by Informal Social control?</h3>
"Informal social control" is being exercised in a society through the established social order. This means that, it is not being exercised by laws or rules. This is an effective control for "primary groups" or small groups.
The existence of social norms inform mores which are traditional customs and ways of behavior that are typical of a particular society.
Learn more about Social control, refer to the link:
brainly.com/question/1172628
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