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3 years ago

HELP 20 POINTS

Mathematics

1 answer:

DedPeter [7]3 years ago

5 0

Answer:

Step-by-step explanation:

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The value of √2+√2+2cos4x is?

Bogdan [553]

Answer:

2.82

Step-by-step explanation:

7 0

4 years ago

What is 3/4(x2+4x+6)=13x-2

maxonik [38]

Answer:

$x_1=12.65\\\\x_2=0.685$

Step-by-step explanation:

$\frac{3}{4}(x^2+4x+6)=(13x-2)\\\\Multiply\ both\ sides\ by\ 4.\\\\3(x^2+4x+6)=4(13x-2)\\\\3x^2+12x+18=52x-8\\\\3x^2+12x+18-(52x-8)=0\\\\3x^2+12x-52x+18+8=0\\\\3x^2-40x+26=0$

Roots of Polynomial:

$Roots\ are\ polynomial\ ax^2+bx+c=0\\\\x=\frac{-b\pm \sqrt{(b^2-4ac)}}{2a}$

$Here\ a=3,\ b-40,\ c=26\\\\x=\frac{-(-40)\pm \sqrt{(-40)^2-4\times 3\times 26}}{2\times 3}\\\\x=\frac{40\pm\sqrt{1288}}{6}\\\\x_1=\frac{40+\sqrt{1288}}{6}\approx 12.65\\\\x_2=\frac{40-\sqrt{1288}}{6}\approx 0.685$

6 0

3 years ago

Help please this is due Friday

alexdok [17]

X=0.697
x=4.30
Hope this helps

7 0

4 years ago

The track coach tells Dave that he still has 80% of his workout left. Dave has run 4 laps so far.

Tpy6a [65]

20% equals 4
80% divided by 20% is 4
4x4=16

he has 16 laps left

7 0

3 years ago

What is the standard deviation of a sampling distribution called?

GarryVolchara [31]

Answer: Standard error.

Step-by-step explanation:

If the population is normally distributed , then the standard deviation of a sampling distribution of the sample mean $[tex]\overline{x}$ [/tex] is known as standard error which depends on population standard deviation $(\sigma)$ and the sample size (n).

$\sigma_x=\dfrac{\sigma}{\sqrt{n}}$

It measure the variability in the sample statistics that happens by chance.

Thus, the standard deviation of a sampling distribution is called the <u>standard error</u>.

8 0

3 years ago