3 miles. 128 yards. Converted to feet

If anyone could do 1,2,3 or 4 that would be great! thanks and i’ll give brainliest :)

Dmitry_Shevchenko [17]

Answer:

ok i will teach all just chat me

Step-by-step explanation:

ok

7 0

4 years ago

a gas is compressed inside a compressor's cylinder. when the piston is at it's button dead center, the gas is initially at 10 ps

Andru [333]

Based on gas laws:

PV/T = Constant, P = Pressure, V = volume, T = Temperature (K)
Therefore,
P1V1/T1 = P2V2/T2

P1 = 10 psig
V1 = 10 in^3
T1 = 65°F = 291.483 K
P2 = ?
V2 = 1.5 in^3
T2 = 180°F = 355.372 K

Rearranging the equation,
P2 = P1V1T2/T1V2 = (10*10*355.372)/(291.483*1.5) = 81.279 psig

7 0

4 years ago

How do similar triangles work?

Keith_Richards [23]

Explanation:

Triangles are similar when their corresponding angles are identical in measure, and their corresponding sides are proportional.

Problems involving similar triangles make use of these characteristics.*

__

Triangles are named by naming their vertices, such as ΔABC, for example. If another triangle is similar, that fact is indicated using the wavy-line similarity symbol (~) between their names. For example:

ΔABC ~ ΔPQR

Corresponding angles are ones in the same position in the triangle's name. For example, angles B and Q correspond, because they are both named second in the similarity statement.

__

Corresponding sides are named by using corresponding vertex names. For example, sides CA and RP are corresponding, because they are both named using the 3rd and 1st letters of the triangle names in the similarity statement.

Corresponding sides are proportional. This can be written different ways. Here are a couple of them:

AB : BC : CA = PQ : QR : RP

AB : PQ = BC : QR = CA : RP . . . . ratios are the same; they may be > 1 or < 1.

This means that if you know the ratio of any two corresponding sides in similar triangles, you know the ratio of all corresponding sides. This fact is used to solve problems involving side lengths.

Typically you might be given two sides of one triangle and two sides of a similar triangle (one corresponding). You can find the measures of the two missing sides by making use of the above relationships.

_____

* In general, problems in algebra and geometry make use of the relationships you learn. That is the point of learning the relationships. They let you write equations that relate what you know to what you don't know. Solving these equations lets you solve the problem.

7 0

4 years ago

Distribute and combine like terms.<br> 7(4a+3b-6)-3(3a-2b+4)

andrew11 [14]

Answer:

19a+27b-54

Step-by-step explanation:

First distribute 7 into the first equation. (4a+3b-6) Multiply each coefficient and the constant by 7.

28a+21b-42

Then do the same for -3 and (3a-2b+4).

-9a+6b-12

Rewrite the equation 28a+21b-42-9a+6b-12.

Combine like terms: 19a+27b-54

5 0

4 years ago

Because of staffing decisions, managers of the Gibson-Marimont Hotel are interested in the variability in the number of rooms oc

Anit [1.1K]

Answer:

a) $\hat \sigma^2 =s^2 =30^2 = 900$

b) $567.277 \leq \sigma^2 \leq 1690.224$

Rounded to the nearest number would be:

$567 \leq \sigma^2 \leq 1690$

c) $23.818 \leq \sigma \leq 41.112$

And rounded :

$23.8 \leq \sigma \leq 41.1$

Step-by-step explanation:

Data given and notation

s=30 represent the sample standard deviation

$\bar x=290$ represent the sample mean

n=20 the sample size

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population mean or variance lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

The Chi Square distribution is the distribution of the sum of squared standard normal deviates .

Part a

The best point of estimate for the population variance is the sample variance, so on this case:

$\hat \sigma^2 =s^2 =30^2 = 900$

Part b

The confidence interval for the population variance is given by the following formula:

$\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma \leq \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}$

The next step would be calculate the critical values. First we need to calculate the degrees of freedom given by:

$df=n-1=20-1=19$

Since the Confidence is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , and we can use excel, a calculator or a table to find the critical values.