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Mariulka [41]
3 years ago
5

What is the main advantage of using money instead of bartering? A. Many more people today use money than bartering to get goods

and ervices. B. Not all countries use the same types of money in their economies C. Money comes in different values to ay for goods and services D. people do not have to have a good or a service that another person wants
Mathematics
2 answers:
sladkih [1.3K]3 years ago
7 0
Yes, I agree! The answer is D!
alekssr [168]3 years ago
6 0

D. people do not have to have a good or service that another person wants

Reason: Money gives people a universal unit of value. For example, If I needed a toothbrush and I have a pair of scissors, In order for me to get a tooth brush is to trade my scissors with someone else who has a tooth brush and wants scissors. As you can see, this isn't practical. If I had money, I will only need to find someone who has a tooth brush.

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I need help I have 20 min
Bezzdna [24]

Answer:

1- d

2- a

3- d

4- b

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Find the missing lengths of the sides.
Sati [7]

Answer:

sin 30°=8/c

1/2=8/c

c=16.

tan 60°=b/8

√3=b/8

b=8√3.

4 0
3 years ago
An unfair coin with​ Pr[H] = 0.2 is flipped. If the flip results in a​ head, a marble is selected at random from a urn containin
satela [25.4K]
Normally when dealing with coins the probability of getting heads or tails is 0.5 each. However in this case since its an unfair coin, the probability of getting heads is 0.2. 
H - head 
T - tails
R - red marble
pr (H) = 0.2
urn
6 red and 4 blue
pr (T)   = 0.8
urn
3 red and 5 blue

when heads is obtained 
red - 6/10 -0.6
blue - 4/10 - 0.4
therefore when multiplying with 0.2 probability of getting heads
pr (R ∩ H) red - 0.6*0.2 = 0.12

when tails is obtained 
red - 3/8 - 0.375
blue - 5/8 - 0.625
when multiplying with 0.8 probability of getting tails
pr (R ∩ T) red - 0.375 * 0.8 = 0.3

using bayes rule the answer can be found out, 
the following equation is used;
pr (H | R) = pr (R ∩ H) / {pr (R ∩ H) + pr (R ∩ T)}
               = 0.12 / (0.12 + 0.3)
               = 0.12 / 0.42
               = 0.286
the final answer is 0.286
6 0
3 years ago
Even if I have use bidmas I'm still confuse with this equation <br> (-7i)(2+i)+(2i)(-7i)
zheka24 [161]
Assuming "i" is an imaginary unit:
(-7i)(2+i)+(2i)(-7i)=\\&#10;-14i+7+14=\\&#10;21-14i
5 0
3 years ago
I really need help on #51
4vir4ik [10]
That's what I did and since the zeros would be -5 and 3 the answer would be 3 since it can't be a negative

5 0
3 years ago
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