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Pani-rosa [81]
3 years ago
13

HELP ASAP WILL MAKE YOU THE BRAINLIST

Mathematics
1 answer:
dusya [7]3 years ago
8 0

Answers:

#1: A

#2:C

#4:D

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How much of a radioactive substance must be presented to decay to 80 grams in 12 years if the half-life of the substance is 7.6
max2010maxim [7]

Answer:

Radioactive in half life is 51gram

Step-by-step explanation:

80grams:12years

X :7.6years

12x÷x=x

7.6×80÷12=51gram

4 0
2 years ago
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From a sample with nequals8​, the mean number of televisions per household is 4 with a standard deviation of 1 television. Using
OlgaM077 [116]

Answer:

75% of the households have between 2 and 6 televisions

Step-by-step explanation:

From the question, we can deduce the following;

sample size n= 8

sample mean μ = 4

standard deviation σ = 1

Using Chebychev’s theorem;

P(2 ≤ X ≤ 6) = P(2-4 ≤ (X - μ) ≤ 6-4)

= P(-2 ≤ (X-μ) ≤ 2) = P(|X-μ| ≤ kσ) ≥ (1 - 1/k^2) ≥ (1- 1/2^) = 1- 0.25 = 0.75 ( same as 75%)

3 0
3 years ago
(-1) + (-7) answer with work shown
lesya [120]
Answer is -8

(-1)+(-7) turns into (1)+(7)=8 and then back to original which will be -8
4 0
3 years ago
Find the value of 5y-11 given that -5y=-45
Vlada [557]

Answer:

34

Step-by-step explanation:

-5y=-45

y=-45/-5

=9

y=9

then

5y-11=5×9-11

=45-11

=34

6 0
3 years ago
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3(5 - 2x) + 2(x-3) plz help me quick:(
trasher [3.6K]

Answer:

9-4x is simplified

Step-by-step explanation:

hope this helps

7 0
3 years ago
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