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3 years ago

1) 0.1.x - 0.006 = 0.08.x + 0.134

Mathematics

1 answer:

skad [1K]3 years ago

6 0

Answer:

x=7

Step-by-step explanation

left part + 0.006 = right part + 0.006

----> 0.1x = 0.08x+0.14

left part -0.08x =right part - 0.08x

----> 0.02x=0.14

x=7

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18. A credit card company claims that the mean time the customers spend on

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Answer: If the null hypothesis is true, the probability of observing a sample mean of at least 5.15 minutes is .031

Step-by-step explanation:

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3 years ago

Question 8

sasho [114]

we are given

system of equations

First equation is

$3x-2y=31$

Second equation is

$3x+2y=-1$

now, we can find augmented matrix

$A=\begin{pmatrix}3&-2&31\\ 3&2&-1\end{pmatrix}$

now, we can change it into reduced row echelon form

step-1: multiply the 1st row by 1/3

$A=\begin{pmatrix}1&-2/3&31/3\\ 3&2&-1\end{pmatrix}$

step-2:add -3 times the 1st row to the 2nd row

$A=\begin{pmatrix}1&-2/3&31/3\\ 0&4&-32\end{pmatrix}$

step-3:multiply the 2nd row by 1/4

$A=\begin{pmatrix}1&-2/3&31/3\\ 0&1&-8\end{pmatrix}$

step-4: add 2/3 times the 2nd row to the 1st row

$A=\begin{pmatrix}1&0&5\\ 0&1&-8\end{pmatrix}$

so, we get

$x=5,y=-8$

Answer is (5,-8)

6 0

3 years ago

Read 2 more answers

What would answer be t -3x + 6 + 12 y

Evgesh-ka [11]

-3x + 6 + 12 y. I am afraid that there are no like terms to combine, and it is neither an equation nor an inequality.

Hope this Helps!

8 0

3 years ago

Suppose that 12 people enter an elevator on the 1st floor of a 24 floor building. Assume that all 12 independently pick a floor

olga2289 [7]

Answer:

∑E(x $_{i}$ ) = 13.49167 floors

Step-by-step explanation:

The expected number of floors no one get off = ∑E(x $_{i}$ ) where i is from 0 to 23

and E(x $_{i}$ ) = ∑x $_{i}$ P(x $_{i}$ )

here x $_{i}$ is the indicator of floor where no one gets off, its value is 0 when atleast one person get off on its floor and 1 when when no one gets off.

Now,

P(x $_{i}$ =1) = (22/23)¹²

P(x $_{i}$ =0) = [1-(22/23)¹²]

Now,

E(x $_{i}$ ) = ∑x $_{i}$ P(x $_{i}$ ) = 0* [1-(22/23)¹²] + 1*(22/23)¹² =0.586594704

For total number of floors where no one gets off

∑E(x $_{i}$ ) = E(x₁)+E(x₂)+E(x₃)........................+E(x₂₃)

∑E(x $_{i}$ ) = 23*0.586594704

∑E(x $_{i}$ ) = 13.49167 floors

6 0

3 years ago