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Advocard [28]
2 years ago
12

The rate at which people learn about a secret is directly proportional to the number of people who know the secret. If two peopl

e know the secret on day 0, and 20 people know it on day 2, how long will it take for the whole school (4000 people) to know?
Mathematics
1 answer:
fenix001 [56]2 years ago
8 0

Answer:

between 222 and 223 days

Step-by-step explanation:

This relation includes the point (0, 2).

A proportional relation must include the point (0, 0).

This is not proportional, but it may be linear.

Points: (0, 2), (2, 20)

y = mx + b

20 = (20 - 2)/(2 - 0) × 2 + b

20 = 18/2 × 2 + b

b = 2

y = 18x + 2

When 4000 people know, y = 4000.

y = 18x + 2

4000 = 18x + 2

3998 = 18x

x = 3998/18

x = 222.111...

Answer: between 222 and 223 days

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t1= 2-3-6=-7

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2 years ago
A football is thrown from the stadium. The height of this football can be represented by the polynomial -16t2 +32t + 20, where t
olasank [31]

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C

Step-by-step explanation:

related equation

-16t^2 + 32t + 20 = 0

-4t^2 + 8t + 5 = 0

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t2 = (-4 - 6)/-4 = 5/2

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-16(2t+1/2)(2t-5/2)

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5 0
3 years ago
there are two boxes. in the first box there are 7 cards numbered from 1 tp 7 the second box also contains 7 cards from 1-7 pick
mrs_skeptik [129]

Answer:

\frac{6}{49}

Step-by-step explanation:

GIVEN: There are two boxes. in the first box there are 7 cards numbered from 1 to 7 the second box also contains 7 cards from 1-7 pick one card from each box.

TO FIND: probability that the sum of the two two cards is at least 12.

SOLUTION:

sample case such that sum of cards is 12 : (5,7),(7,5),(6,6)

sample case such that sum of cards is 13 : (7,6),(6,7)

sample case such that sum of cards is 14 : (7,7)

Total sample case such that sum is atleast 12 =6

Total sample cases=49

probability that the sum of the two two cards is at least 12=\frac{\text{sample case in which sum is atleast 12}}{\text{total sample cases}}

=\frac{6}{49}

probability that the sum of the two two cards is at least 12 is \frac{6}{49}

8 0
3 years ago
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