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4 years ago

What is the answer for r(x)=-x–7

Mathematics

1 answer:

andrezito [222]4 years ago

4 0

Answer:

r(x) = -7

Step-by-step explanation:

r(x) = -x - 7

+ 7 + 7

7 = -x

÷ -x ÷ -x

7/-1 = x

-7 = x

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John randomly picks a number from 1 to 5 (both inclusive) and a letter from A to E (both inclusive). What is the probability tha

Greeley [361]

Answer:

$P(A \cap B) = P(A) *P(B) =\frac{1}{5} \frac{1}{5}= \frac{1}{25}$

So then the best option would be:

a. 1/25

Step-by-step explanation:

For this case we assume that the sample space for the numbers is :

$S_1= [A,B,C,D,E]$

And the sample space for the numbers is:

$S_2 =[1,2,3,4,5]$

Both sampling spaces with a size of 5.

We define the following events:

A="We select a 2 from the numbers"

B= "We select a E from the letters"

We can find the individual probabilities for each event like this:

$P(A)= \frac{1}{5}$

$P(B) = \frac{1}{5}$

And assuming independence we can find the probability required like this:

$P(A \cap B) = P(A) *P(B) =\frac{1}{5} \frac{1}{5}= \frac{1}{25}$

The last probability is the probability of obtain obtain a 2 AND an E

So then the best option would be:

a. 1/25

3 0

4 years ago

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ANWNSWER THIS FAST PLZZZZ!!!!!!!!!!!!!

devlian [24]

Step-by-step explanation:

$\frac{1}{15}$

0.0666666666666

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3 years ago

Gary Oak is on a mission to complete his Pokedex before Ash Ketchum. To this end, he startssearching the tall grass for Pokemon.

bazaltina [42]

Answer:

Variance Σ i=1 (1 - Pi) /Pi^2

Expected value= π(1/1 + 1/2 .......... 1/n) = π.Hn

Step-by-step explanation:

From the information given, we can get

E(T) = E(t1) + E(t2) ......... +E(tn)

1/P1 + 1/P2.......... 1/Pn

-π/r + π/ r-1 +........... π/1

π(1/1 + 1/2 .......... 1/n)

To find the variance,

Variance= var (x1 + x2......... +xr)

E i=1 var (Xi)

Where,

x1, x2, x3 ........... are all independent of each other.

In case of xi : var (xi) = E(xi^2) - E(xi^2)

Probability of the ith term of coupon that would be observed

Pi = (n - i - 1)/n

Therefore,

i-1 coupons out of a total of n coupons.

To calculate Exi, probability Pi

The expected number of coupons required should be = 1

In probability, 1 - Pi expected number of coupons required E (Xi +1)

E(Xi) = Pi + (1- Pi) E(xi + 1)

E(Xi) = 1/Pi

Due to the above,

E(Xi)^2= Pi + (1- Pi) E(xi + 1)^2

E(Xi)^2= Pi + (1- Pi) E(xi^2 + 1 + 2xi)

E(Xi)^2= 2/Pi^2 - 1/Pi

Var (Xi) = 2/Pi^2 - 1/Pi - 1/Pi^2

= (1 - Pi) /Pi^2

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3 years ago

Decrease £900 by 5%?

GaryK [48]

45 should be the answer for that specific question.

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3 years ago

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PLEASE HELP Solve using linear combination 8x + y = 14 3x + y = 4

yKpoI14uk [10]

Answer:

The solution of the linear system is:

$x = 2$ and $y = -2$

Step-by-step explanation:

The following linear equation is solved as follows:

$8\cdot x + y = 14$

$3\cdot x + y = 4$

After some algebraic manipulation:

$y = 14 - 8\cdot x$

$y = 4 - 3\cdot x$

$14 - 8\cdot x = 4 - 3\cdot x$

$10 = 5\cdot x$

$5\cdot x = 10$

$x = 2$

And finally,

$y = 4 - 3\cdot (2)$

$y = -2$

The solution of the linear system is:

$x = 2$ and $y = -2$

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3 years ago

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