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2 years ago

Evaluate: 2x - 3y for x = 2, y = - 3

Mathematics

2 answers:

Anika [276]2 years ago

8 0

Answer:

Step-by-step explanation:

x = 2 and y = -3

2x - 3y ==> 2(2) - 3(-3)

= 4 + 9

= 13

Airida [17]2 years ago

7 0

Answer:

Step-by-step explanation:

2(2)-3(-3)

4+9

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Assume that different groups of couples use the XSORT method of gender selection and each couple gives birth to one baby. The XS

olganol [36]

Answer:

Mean and Standard deviation for the numbers of girls in groups of 36 births are 18 and 3 respectively.

Step-by-step explanation:

We are given that he X SORT method is designed to increase the likelihood that a baby will be a girl, but assume that the method has no effect, so the probability of a girl is 0.5.

Now consider a group consisting of 36 couples.

The above situation can be represented through binomial distribution;

$P(X=r)=\binom{n}{r} \times p^{r} \times (1-p)^{n-r} ;x=0,1,2,3,.....$

where, n = number of trials (samples) taken = 36 couples

r = number of success

p = probability of success which in our question is probability

of a girl, i.e.; p = 0.5

Let X = Numbers of girls in groups of 36 births

So, X ~ Binom(n = 36, p = 0.5)

Now, mean for the numbers of girls in groups of 36 births is given by;

Mean, E(X) = $n \times p$ = $36 \times 0.5$ = 18

Also, standard deviation for the numbers of girls in groups of 36 births is given by;

Standard deviation, S.D.(X) = $\sqrt{n\times p\times (1-p)}$

= $\sqrt{36\times 0.5\times (1-0.5)}$

= 3

3 0

3 years ago

Find the area of the circle 3.6

swat32

Answer:

The formula to get the area of a circle is: A = πr²

Area = pi × radius²

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2 years ago

Kelly reduced the size of a portrait to have a width of 10 inches. if she used a scale of 1 inch :2 inches, what was the width o

NARA [144]

So basically you use the ratio they have given you. You either multiply by 2 if image is enlarged or divide by 2 if it is reduced. (Keep in mind I got the 2 from your ratio : 1inch : 2inches) Therefore the find the original width, you multiply 10 by 2, giving you 20 inches.

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3 years ago

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Delvig [45]

Answer:

yes

Step-by-step explanation:

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2 years ago

Add 5 + (-8) The answer is -3 TRUE OR FALSE

dimaraw [331]

Answer:

True

Step-by-step explanation:

5 + (-8) is the same thing as 5-8

Hope this helps!!!

5 0

3 years ago

Read 2 more answers