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2 years ago

Please help!!! Number 8 please

Mathematics

1 answer:

Verdich [7]2 years ago

4 0

Answer:

21.43 mph

Step-by-step explanation:

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Can somebody help me with this question please?

Lana71 [14]

Answer:

if the area is 7 then the total side length is sqrt 7. 2 is also sqrt 4 so x pretty much equals sqrt 3. this equation is a typo, as sqrt isn't a solution. moreover if you factor the square, it will equal x squared plus 4x plus 4.

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3 years ago

If z^1/2 = x^1/2 + y^1/2 , prove that (x + y - z)^2 = 4xy.<br><br>HELPP MEEEEE

lawyer [7]

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3 years ago

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If two donuts was taken from three donuts how many are left

Free_Kalibri [48]

There would be one donut left. 3-2=1

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3 years ago

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There are 11 students on a committee. To decide which 4 of these students will attend a conference, 4 names are chosen at random

Alina [70]

Answer:

0.003 = 0.3% probability that Sarah, Jamal, Kate, and Mai are chosen in any order.

Step-by-step explanation:

The students are chosen without replacement, which means that the hypergeometric distribution is used to solve this question.

Hypergeometric distribution:

The probability of x successes is given by the following formula:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

In which:

x is the number of successes.

N is the size of the population.

n is the size of the sample.

k is the total number of desired outcomes.

Combinations formula:

$C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

In this question:

11 students means that $N = 11$

4 are Sarah, Jamal, Kate, and Mai, so $k = 4$

4 are chosen, which means that $n = 4$

What is the probability that Sarah, Jamal, Kate, and Mai are chosen in any order?

This is P(X = 4). So

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

$P(X = 4) = h(4,11,4,4) = \frac{C_{4,4}*C_{7,0}}{C_{11,4}} = 0.003$

0.003 = 0.3% probability that Sarah, Jamal, Kate, and Mai are chosen in any order.

7 0

3 years ago

What is the factor of х+8x+7

xxMikexx [17]

Answer:

(x + 7) (x + 1)

Step-by-step explanation:

Product = 7

Sum = 8

Factors = 1 , 7

x² + 8x + 7 = x² + 7x + x + 7

= x(x + 7) + (x + 7)

= (x + 7) (x + 1)

3 0

3 years ago