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Dima020 [189]
2 years ago
13

A professor has learned that three students in his class of 20 will cheat on the final exam. He decides to focus his attention o

n four randomly chosen students during the exam. What is the probability that he finds at least one of the students cheating
Mathematics
1 answer:
miss Akunina [59]2 years ago
4 0

Answer:

6%

Step-by-step explanation:

3/20=4/x

It is a indirect proportion so we reciprocal,

Then,

3/20=x/40

3×40=20×x

120=20x

x=120/20

x=6

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Vladimir [108]
She wants 25she divides each by 12 to get for 1 person then multiplies by 25 to get for 25 peoplemulitply each ingredient by 25/12
for multiplying fractions, try to put them in standard a/b form first


flour1 and 1/2 times 25/12=2/2+1/2 times 25/12=3/2 times 25/12=75/24=25/8=24/8+1/8=3+1/8=3 and 1/8 cup flour


baking powder1 times 25/12=25/12=24/12+1/12=2+1/12=2 and 1/12 tsp baking powder

salt1/2 times 25/12=25/24=24/24+1/24=1+1/24=1 and 1/24 tsp salt

butter1 times 25/12=25/12=24/12+1/12=2+1/12=2 and 1/12 stick of butter

sugar
1 times 25/12=25/12=24/12+1/12=2+1/12=2 and 1/12 cup of sugar

eggs3 times 25/12=3/1 times 25/12=75/12=25/4=24/4+1/4=6+1/4=6 and 1/4 eggs


vanilla extract
1 and 1/2 times 25/12=2/2+1/2 times 25/12=3/2 times 25/12=75/24=25/8=24/8+1/8=3+1/8=3 and 1/8 tsp vainlla extract

milk3/4 times 25/12=75/48=25/16=16/16+9/16=1+9/16=1 and 9/16 cup milk




for 25 servings
she needs

3 and 1/8 cup flour
2 and 1/12 tsp baking powder1 and 1/24 tsp salt2 and 1/12 stick of butter2 and 1/12 cup of sugar
6 and 1/4 eggs3 and 1/8 tsp vanilla extract1 and 9/16 cup milk
4 0
3 years ago
IF THREE DIAGONALS ARE DRAWN INSIDE A HEXAGON WITH EACH ONE PASSING THROUGH THE CENTER POINT OF THE HEXAGON, HOW MANY TRIANGLES
frosja888 [35]

Answer: 6 triangles

Step-by-step explanation:

hope this helps :)

3 0
1 year ago
Ab+ac-a²-bc ??????????????????​
babunello [35]
Answer: ab+a-b
ab+ac-a2
CLT( collect like terms)
ab+a2+ac-bc
ab+a-b.

Hope this is correct



6 0
3 years ago
Kelly leaves her home and cycles 4y miles south then cycles (3y + 9) miles east
atroni [7]
4y(3y + 9)
12y + 36
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7 0
3 years ago
A musical group is putting on show at the theatre. They collected $880 from 120 people attending. The price of an adult ticket i
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Answer: 60 adults and 60 students

Step-by-step explanation:

7 0
3 years ago
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