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2 years ago

How do you do this I need help

Mathematics

2 answers:

horsena [70]2 years ago

8 0

2 11 14 10
33.250
- 21.463
—————
11.787

Line up your decimals and add an extra zero so that there’s 3 numbers after 33 and 21. 0-3 isn’t possible so you would take 1 away from 5 which leaves you with 4.

10-3=7

4-6 wouldn’t be possible so you take 1 away from 2 and it gives you 14 since you add the 1 before the 4

14-6=8

1-4 isn’t possible as well so take 1 away from 3 and you would get 11.

11-4=7

2-1=1
3-2=1

(Note: when you take 1 away from a number. It’s suppose to be taken away from the number in front of the number that needs the 1)

I hope this helped

madreJ [45]2 years ago

3 0

You need to line the numbers up then subtract

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The question is incomplete! The complete question along with answer and explanation is provided below.

Question:

Bob discovers a box with 30 identical, used, rechargeable batteries in his attic.

Suppose each of them is equally likely have some charge in it, or to have run out of charge. What is the probability that:

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Answer:

Part A) P = 9.31x10⁻¹⁰

Part B) P = 5.529x10⁻⁴

Step-by-step explanation:

It is given that probability of success or failure is 50%

Let

failure = battery is out of charge

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The probability can be found by using binomial distribution formula

P = nCr (p^r) (q^n-r)

where r is the number of success

n = 30, r = 30 and n - r = 30 - 30 = 0

P = ₃₀C₃₀(0.50)³⁰(0.50)⁰

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Part B) 20% of them are out of charge?

Out of charge batteries = 0.20*30 = 6

n = 30, r = 24 and n - r = 30 - 24 = 6

P =₃₀C₆(0.50)²⁴(0.50)⁶

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