Answer:
Step-by-step explanation:
Let the original cost be x
The shoppers get 10% of the original price
Therefore the equation to find final cost =
Discount: 10x/100
Final Cost: 90x/100
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Answer: what is wrong with it
Step-by-step explanation:
Answer:
3/50
Step-by-step explanation:
Multiply across the fraction- First start with the numerator digits (-1, 3, and -2)
-2*-1= 2 and 2*3= 6 So you should have 6 as your numerator
Now look at the denominator digits (4, 5, and 5)
Multiply across and you should get 100 as your denominator
You now have 6/100 but you are not done yet! Don't forget to simplify the fraction to get your final answer
Both 6 and 100 are divisible by 2 (6 divided by two is 3, and 100 divided by two is 50)
Thus, your final answer should be 3/50!
Answer:
4x + 8
Step-by-step explanation:
You have to multiply 4 times x and 2.
4 times x = 4x
4 times 2 = 8
Add them together and you get ...
4x + 8
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Answer:
probability that the student knew the answer given that he answered the question correctly is 0.7742 (77.42%)
Step-by-step explanation:
a student can get the question right in 3 ways:
- knowing the answer with probability 0.5
- eliminating one of the 4 choices and guessing with the remaining 3 with probability 0.25
- or guessing from the 4 choices with probability 0.25
then defining the event R= getting the answer right , we have
P(R)= probability of knowing the answer*probability of getting the question right if knowing the answer + probability of eliminating one answer* probability of getting the question right if eliminates one answer + probability of guessing the 4 choices * probability of getting the question right if guessing the 4 choices
thus
P(R)= 0.5*1 + 0.25* 1/3 + 0.25*1/4 = 0.6458
then we use conditional probability through the theorem of Bayes. Defining K= student knew the answer
then
P(K/R) = P(K∩R) /P(R) = 0.5*1/0.6458 = 0.7742 (77.42%)
where
P(K∩R) = probability that the student knew the answer and answers the question correctly
P(K/R)= probability that the student knew the answer given that he answered the question correctly
