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3 years ago

Please help me with this

Mathematics

1 answer:

Leno4ka [110]3 years ago

3 0

Answer:

abcdefghijklmnopqrstuvwxyz

Step-by-step explanation:

know i know my abcs why wont you sing with me

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X−3y+4z=−4<br> 2x−9y+11z=−20<br> x−2y+3z=0

kakasveta [241]

Answer:

Step-by-step explanation:

5 0

3 years ago

Answer ASAP please!

lara31 [8.8K]

Answer:

Step-by-step explanation:

A. Sin 42=0.669

Cos=52=0.617

B. Sin 90=1

cos 90=0

C. cos30=0.866

sin 70=0.940

D. sin80=0.985

cos 10=0.985

3 0

3 years ago

A class survey in a large class for first-year college students asked, “About how many minutes do you study on a typical weeknig

Anika [276]

Answer: (110.22, 125.78)

Step-by-step explanation:

The confidence interval for the population mean is given by :-

$\mu\ \pm z_{\alpha/2}\times\dfrac{\sigma}{\sqrt{n}}$

Given : Sample size = 463

$\mu=118\text{ minutes}$

$\sigma=65\text{ minutes}$

Significance level : $\alpha=1-0.99=0.01$

Critical value : $z_{\alpha/2}=z_{0.005}=\pm2.576$

We assume that the population is normally distributed.

Now, the 90% confidence interval for the population mean will be :-

$118\ \pm\ 2.576\times\dfrac{65}{\sqrt{463}} \\\\\approx118\pm7.78=(118-7.78\ ,\ 118+7.78)=(110.22,\ 125.78)$

Hence, 99% confidence interval for the mean study time of all first-year students = (110.22, 125.78)

3 0

3 years ago

Triangle EFG is dilated by a scale factor of 1/4 to form triangle E'F'G'. Side E'F' measures 12.512.5. What is the measure of

WINSTONCH [101]

Answer: 3.125

Step-by-step explanation:

Given

Triangle is dilated by a factor of $\frac{1}{4}$ i.e. each side multiplies to 0.25.

Side E'F' becomes 0.25 times the original length

$\Rightarrow E'F'=\dfrac{1}{4}\times 12.5=3.125$

6 0

3 years ago

Does the point (7 5) satisfy the equation y = x + -2

masha68 [24]

Answer:

Yes

Step-by-step explanation:

7 = x

5 = y

5 = X + - 2

5 = X - 2

If X is 7 then

5 = 7-2

5=5

yes

3 0

2 years ago