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3 years ago

Can someone help me please?

Mathematics

1 answer:

MAVERICK [17]3 years ago

4 0

Good. I hope you get locked, most mainly banned. Nobody needs you, “FrIsK”

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Find an expression which represents the sum of (-5x + 10) and (-7x + 9) in simplest terms.

Brrunno [24]

Answer:

-12x+19

Step-by-step explanation:

Combine like terms first soooo

-5x-7x=-12x

10+9=19

-12x+19 is your answer

3 0

3 years ago

The number of hours between successive train arrivals at the station is uniformly distributed on (0, 1). Passengers arrive accor

Zepler [3.9K]

Answer:

The value of $E(X) =\frac{7}{2}$ .

The value of $Var (X)= \frac{91}{12}$ .

Step-by-step explanation:

Consider the provided information.

The number of hours between successive train arrivals at the station is uniformly distributed on (0, 1). Passengers arrive according to a Poisson process with rate 7 per hour.

Let X denote the number of people who get on the next train.

Part (A)

Here, X = N(T), N(t) ∼ Poisson(λt), and λ = 7

Therefore, E(N(T)|T) = λT

Now find E(X) as shown below

$E(X) = E(N(T))$

$E(X) = E(E(N(T)|T))$

$E(X) = E(\lambda T) = \frac{7}{2}$

Hence, the value of $E(X) =\frac{7}{2}$ .

Part (B)

Now we need to find VAR[X]

$Var (X) = Var (E(N(T)|T)) +E(Var (X|T))$

$Var (X)= E(\lambda T)+Var (\lambda T)$

$Var (X)= \frac{49}{12}+\frac{7}{2}$

$Var (X)= \frac{91}{12}$

Hence, the value of $Var (X)= \frac{91}{12}$

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3 years ago

3x + 2 = 14 Which number makes the equation true? 1 2 2 4 6

mrs_skeptik [129]

Answer:

$x=4$

Step-by-step explanation:

$3x+2=14\\\\3x+2-2=14-2\\\\3x=12\\\\\displaystyle \frac{3x}{3}=\frac{12}{3}\\ \\ x=4$

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2 years ago

Which equation can be used to find n the distance between 3/8

GuDViN [60]

Answer:

3/8 - N = 61/64.

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3 years ago

you buy 7 packages total of AA and AAA. AA has 6 batteries in each pack and AAA has 8 batteries in each pack. you end up with 52

Nina [5.8K]

Answer:

you bought 8 packs in total or four of each

Step-by-step explanation:

if you ad 6 and eight you get 14 and when you divide 52 by 14 you get four. to ensure your answer if you multiply 6 by 4 and 8 by 4 and add them together you will get 52

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3 years ago