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3 years ago

Help with picture ??

Mathematics

1 answer:

9966 [12]3 years ago

4 0

Answer:

b,f is right

Step-by-step explanation:

You might be interested in

If x varies inversely with y and x = 4 when y = 9, find x when y = 6.

Andre45 [30]

x = 6

given x varies inversely with y then

xy = k ← k is the constant of variation

to find k use the condition x = 4 when y = 9, hence

k = 4 × 9 = 36

x = $\frac{36}{y}$ ← inverse variation equation

when y = 6, then x = $\frac{36}{6}$ = 6

4 0

3 years ago

A scale has a percent error of 7%. The scale reads the mass of a book as 450 g.

melisa1 [442]

Answer:

The actual mass is either 453 or 447

Step-by-step explanation:

7 percent of 450

= (7/100) * 45

= 3.15

error = 3.15 g

hence actual mass

= 450 + 3.15

= 453.15

= 450 - 3.15

= 446.85

5 0

3 years ago

Can you solve and explain the steps you would use in solving 2- step equations?

castortr0y [4]

Http://www2.ccsd.ws/sbfaculty/team8e/jecole/Math/Two%20step%20Equations.htm this link explains it all

6 0

4 years ago

A university surveyed recent graduates of the English Department for their starting salaries. Four hundred graduates returned th

AveGali [126]

Answer:

$\hat \mu = \bar X = 25000$

Step-by-step explanation:

Data given

$\bar X = 25000$ represent the sample mean obtained

$s= 2500$ represent the sample deviation obtained

$\mu =?$ represent the true mean (variable of interest)

n=400 represent the sample size selected

Solution to the problem

The best estimator for the true mean $\mu$ is given by the sample mean $\bar X$ , and the reason is: If we assume that in tha random sample $X_1,X_2,....,X_{400}$ each observation follows a normal distribution like this:

$X_i \sim N(\mu, \sigma)$

Then when we find the expected value for the sample mean we have this:

$E(\bar X)= E(\frac{\sum_{i=1}^n X_i}{n})$

If we use the properties of the expected value we have:

$E(\bar X) =\frac{1}{n} \sum_{i=1}^n E(X_i)$

And since the expected value of each observation is the same we have:

$E(\bar X) =\frac{1}{n} \sum_{i=1}^n \mu =\frac{1}{n} n\mu = \mu$

So then we have that the best estimator for the population mean is given by:

$\hat \mu = \bar X = 25000$

7 0

3 years ago

Which expression is equal to 7 times the sum of a number and 4

mamaluj [8]

Answer:

7(n + 4)

Step-by-step explanation:

Represent the number by n. Then the verbal expression becomes

7(n + 4).

7 0

4 years ago