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skad [1K]
3 years ago
7

True or False: Decay destroys tooth enamel.

Mathematics
2 answers:
Alex73 [517]3 years ago
7 0
True, Hope this helps
irinina [24]3 years ago
3 0
The answer is true bc decay ends up making it weaker which ends up destroying the tooth enamel
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nadezda [96]
X + 9 = 2x - 3
<u>-x         -x        </u>
     9 = x - 3
<u>   +3       +3</u>
   12 = x
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4 years ago
If f(x) = 4x4 + 5x2 + 4, then what is the remainder when f(x) is divided by<br> 2 + 2?
Westkost [7]

Step-by-step explanation:

16+10+4

26+4

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30÷(2+2)

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4 years ago
Data collected at Toronto Pearson International Airport suggests that an exponential distribution with mean value 2725hours is a
Ivan

Answer:

a) What is the probability that the duration of a particular rainfall event at this location is at least 2 hours?

We want this probability"

P(X >2) = 1-P(X\leq 2) = 1-(1- e^{-0.367 *2})=e^{-0.367 *2}= 0.48

At most 3 hours?

P(X \leq 3) = F(3) = 1-e^{-0.367*3}= 1-0.333 =0.667

b) What is the probability that rainfall duration exceeds the mean value by more than 2 standard deviations?

P(X > 2.725 + 2*5.540) = P(X>13.62) = 1-P(X

What is the probability that it is less than the mean value by more than one standard deviation?

P(X

Step-by-step explanation:

Previous concepts

The exponential distribution is "the probability distribution of the time between events in a Poisson process (a process in which events occur continuously and independently at a constant average rate). It is a particular case of the gamma distribution". The probability density function is given by:

P(X=x)=\lambda e^{-\lambda x}

The cumulative distribution for this function is given by:

F(X) = 1- e^{-\lambda x}, x\ geq 0

We know the value for the mean on this case we have that :

mean = \frac{1}{\lambda}

\lambda = \frac{1}{Mean}= \frac{1}{2.725}=0.367

Solution to the problem

Part a

What is the probability that the duration of a particular rainfall event at this location is at least 2 hours?

We want this probability"

P(X >2) = 1-P(X\leq 2) = 1-(1- e^{-0.367 *2})=e^{-0.367 *2}= 0.48

At most 3 hours?

P(X \leq 3) = F(3) = 1-e^{-0.367*3}= 1-0.333 =0.667

Part b

What is the probability that rainfall duration exceeds the mean value by more than 2 standard deviations?

The variance for the esponential distribution is given by: Var(X) =\frac{1}{\lambda^2}

And the deviation would be:

Sd(X) = \frac{1}{\lambda}= \frac{1}{0.367}= 2.725

And the mean is given by Mean = 2.725

Two deviations correspond to 5.540, so we want this probability:

P(X > 2.725 + 2*5.540) = P(X>13.62) = 1-P(X

What is the probability that it is less than the mean value by more than one standard deviation?

For this case we want this probablity:

P(X

8 0
4 years ago
What number is the whole number 7, 1/3 of?
kirza4 [7]

Answer:

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Step-by-step explanation:

7 is the whole number and 1/3 is a fraction

4 0
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What is mpo?<br> 128°<br> O 1730<br> O 1920<br> O 256°
Paladinen [302]

Answer:

it's the 2nd one because

Step-by-step explanation:

have a nice day

8 0
3 years ago
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