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Aleksandr [31]
2 years ago
6

On a six-question multiple-choice test there are five possible answers for each question, of which one is correct (C) and four a

re incorrect (I). If a student guesses randomly and independently, find the probability of being correct on two questions.
Mathematics
1 answer:
brilliants [131]2 years ago
8 0
Since the events are independent and can be reduced to two outcomes, we can solve it using the binomial formula.

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The size of angle aob is equal to 132 degrees and the size of angle cod is equal to 141 degrees. find the size of angle dob.
Varvara68 [4.7K]

angle AOB = 132 and is also the sum of angles AOD and DOB. Hence 
angle AOD + angle DOB = 132°    ---> 1 

angle COD = 141 and is also the sum of angles COB and BOD. Hence 
angle COB + angle DOB = 141°    ---> 2

Now we add the left sides together and the right sides of equations 1 and 2 together to form a new equation. 

angle AOD + angle DOB + angle COB + angle DOB = 132 + 141       ---> 3 

We should also note that: 
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Therefore substituting angle AOD + angle DOB + angle COB in equation 3 by 180 and solving for angle DOB:
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8 0
3 years ago
Solve the equation graphically: √ x = - x.
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6 0
3 years ago
if grace and claire parents each invested 7,600 into college saving account when the girls were born how much money will each gi
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Answer:

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