I think I understand what you are asking but its hard to be sure.
I think its -5 3/4 subracted from 3 1/2
If the question above is the same as you are asking then your answer is -9 1/4
or as a decimal -9.25
The answer is 1/4
Explanation
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The question focuses on "if the student is known to be a boy..." we would obviously know that we would focous on only the total of the boys.
We have the formula for the probability of an event of happening which we would call event A (a boy being left-handed). P(A)= number of favorable outcomes/ total number of possible outcomes. The left-handers would go in the favorable outcomes since we want the probability of a boy being left handed and we would place the total boys in the total number of possible outcomes since all of them are going to be the one to be randomly picked. 50 left-handed/ 200 total boys. We have our fraction that is 50/200 as the probability but we can simplify it! We simplify 50/200 to get 1/4!!! 1/4 is the probability of a boy being picked that is left-handed!
Hope this helps!
Probability Trees - See linked image
A good visual method for this is a probability tree.
Each set of branches represents the probabilities of on coin being removed, the second set is out of 9 as the first coin is taken and not replaced.
Multiply along the lines to work out the probability of each of the combinations.
*Even though only 'Dime Dime' is needed, it is best to do all of them as this way you are able to get all marks in an exam; you can also add up all the final values as a check to see if you are right.
23, 879 to the nearest thousand.
The thousand digit is the 3, and we look at the digit after 3, which is 8, since 8 is more than 5, we round up the 3 to 4.
Therefore 23, 879 to the nearest thousand ≈ 24, 000
I hope this explains it.
The total cost of his purchase is $9.95
Bill has a $10 coupon
He needs to buy 25 balloons
Each balloons cost $1.99
The first step is to divide the coupon amount which is $10 by the cost of the balloon which is $1.99
10/1.99
= 5
The next step is to multiply 5 by the cost of the balloon which is $1.99
5× 1.99
= 9.95
Hence the total cost of his purchase is $9.95
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