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Nikolay [14]
3 years ago
9

Berline. a. -1 b. 1.75 c. -1.75 d. -2 e. -2 1/2 f. 0

Mathematics
1 answer:
alina1380 [7]3 years ago
7 0

Answer: I don’t get it where the question for me to read it and find the answer, you just put this

a. -1

b. 1.75

c. -1.75

d. -2

e. -2 1/2

f.

And that all you did but where is the question????

Step-by-step explanation:

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What two positive real numbers whose product is 21 have the smallest possible​ sum?
GalinKa [24]

Answer:

x=\sqrt{21}

y=\sqrt{21}

Step-by-step explanation:

Let x  and y are the two positive real numbers

product of two numbers is 21

x y=21

y=\frac{21}{x}

The sum of the two numbers is f(x) =x+y

Replace y with 21/x

f(x) =x+\frac{21}{x}

we need to find smallest possible sum , so we take derivative using power rule

f'(x)= 1-\frac{21}{x^2}

when sum is minimum then the derivative is equal to 0

0= 1-\frac{21}{x^2}

0=\frac{x^2-21}{x^2}

multiply both sides by x^2

x^2-21=0

x^2=21

Take square root on both sides

x=\sqrt{21}

y=\frac{21}{x}

y=\frac{21}{\sqrt{21}}

y=\sqrt{21}

3 0
4 years ago
If n and k are positive integers, is n divisible by 6 ? (1) n = k(k + 1)(k – 1) (2) k – 1 is a multiple of 3.
xz_007 [3.2K]

Answer: yes, it is

Step-by-step explanation:

A number is divisible by 6 if it is divisible by 2 and 3 simultaniously.

n = k(k+1)(k-1)

If k-1 is a multiple of 3, n is divisible by 3, so one of the requirements is ok.

Now, if k-1 is a multiple of 3, it can be even or odd.

if k-1 is even, then it is divisible by 2 and as it is divisible by 3 as well, n is divisible by 6

if k-1 is odd, then k and k+1 is even, hence, divisible by 2.

As n = k(k+1)(k-1), n is also divisible by 6.

4 0
4 years ago
in the similarity transformation of ABC to DEF ABC was dilated by a scale factor of ? reflected across the ? and moved through t
Margaret [11]

Answer:

Does the answer help you?

7 0
3 years ago
PLz help!!! Look at the picture below for the question.
12345 [234]

speed of plane flying east = x

speed of plane flying west = x+75

 total speed = 2x+75

distance after 4 hours ( 7-3) = 8x+300

8x+300 = 5460

8x = 5160

x = 5160/8 = 645

 speed of plane flying east = 645 km/h

7 0
3 years ago
A set of data with a mean of 45 and a standard deviation of 8.3 is normally distributed. find the value that is +3 standard devi
lidiya [134]
69.9 is exactly 3 standard deviations away, which means that 78.9 is +3 (more than 3) standard deviations

So the answer is 78.9
3 0
3 years ago
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