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3 years ago

X + 3x + 6 Can someone help me

Mathematics

2 answers:

Kamila [148]3 years ago

7 0

If you have to simplify it , the answer would be 4x+6

azamat3 years ago

5 0

Step-by-step explanation:

x+3x+6=0

4x+6=0

4x=-6

x=-6/4

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There are 8 orange candies and 4 blue candies you select one candy eat it and then select another find P(you select first an ora

Savatey [412]

Orange first = 9/13

Blue next = 4/12

P(both) = (9/13)*(4/12) 
P(both) = 3/13 ~ 0.23

4 0

4 years ago

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Krista has a quiz today. There are 4 questions with 4 options. Each question only has one correct answer. She wants to guess and

Lyrx [107]

Answer:

The probability is 0.258

Step-by-step explanation:

In this question, we want to know the probability of Krista getting exactly 3 out of the options she chooses right.

For all the questions, there are 4 questions with 4 options each

Total number of options is 4 * 4 = 16 options

there are 3 wrong options and one correct option per question. Total number of correct option is 4 and the total number of wrong options is 12

Probability of selecting a wrong option is 12/16 = 3/4 while the probability of selecting a correct option is 1/4

Thus, we can use a Bernoulli approximation to get this probability of getting three right.

let the probability of selecting a correct option be p and that of a wrong option be a.

Probability of selecting exactly three correct ones will be;

P(r = 3) = nCr p^r q^(n-r)

where n is the total number of options and r is the number of options we are selecting to be correct.

The probability = 12C3 * (1/4)^3 * (3/4)^9

= 220 * 0.015625 * 0.075084686279 = 0.258

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4 years ago

6.) Polygons that do not have all sides equal and/or all angles equal

oksano4ka [1.4K]

Answer:

....................trapezium

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4 years ago

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Are the two given triangles similar? Show your work to support your answer. Helpppp please

Romashka [77]

Answer:

Step-by-step explanation:

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3 years ago

One year Roger had the lowest ERAâ€‹ (earned-run average, mean number of runs yielded per nine inningsâ€‹ pitched) of any male p

baherus [9]

Answer:

(a) The z-score of Roger is -1.56 and the z-score of Amber is -1.13.

(b) Roger had a better year relative to his peers.

Step-by-step explanation:

If X follows N (µ, σ₂), then $z=\frac{x-\mu}{\sigma}$ , is a standard normal variate with mean, E (Z) = 0 and Var (Z) = 1. That is, Z follows N (0, 1).

Let X = ERA of male pitchers and Y = ERA of ERA of female pitchers.

It is provided that the mean and standard deviation of X are:

$\mu_{X}=4.371\\\sigma_{X}=0.787$

Also, the mean and standard deviation of Y are:

$\mu_{Y}=4.363\\\sigma_{Y}=0.869$

ER of Roger is 3.14 and ERA of Amber is 3.38.

(1)

Compute the z-score of Roger as follows:

$z=\frac{x-\mu_{X}}{\sigma_{X}}=\frac{3.14-4.371}{0.787}=-1.56$

Thus, the z-score of Roger is -1.56.

Compute the z-score of Amber as follows:

$z=\frac{x-\mu_{Y}}{\sigma_{Y}}=\frac{3.38-4.363}{0.869}=-1.13$

Thus, the z-score of Amber is -1.13.

(2)

Compute the probability of ERA's that are greater than Roger's ERA as follows:

$P(X>3.14)=P(\frac{X-\mu}{\sigma}>\frac{3.14-4.371}{0.787})\\=P(Z>-1.56)\\=P(Z$

This implies that 94% of the other male pitchers had an ERA higher than 3.14.

Compute the probability of ERA's that are greater than Amber's ERA as follows:

$P(Y>3.38)=P(\frac{Y-\mu_{Y}}{\sigma_{Y}}>\frac{3.38-4.363}{0.869})\\=P(Z>-1.13)\\=P(Z$

This implies that 87% of the other female pitchers had an ERA higher than 3.38.

As it is provided that the lower the ERA the better the pitcher, then it can be concluded that Roger had a better year relative to his peers.

4 0

4 years ago