Evaluate 2y + 4 for y = 15.

A store sells almonds for $7 per pound, cashews for $10 per pound, and walnuts for $12 per pound. A customer buys 12 pounds of m

kifflom [539]

First we need to write the equations for the given scenario. Using the equations, we can form a system of matrix for the situation.

Let the customer buys, x pounds of almonds, y pounds of cashews and z pounds of walnuts. Since he buys 12 pounds of mixed nuts, we can write:

$x+y+z=12$

Total cost of these mixed nuts was $118. So we can write:

$7x+10y+12z=118$

Customer buys 2 more pounds of walnut than cashews. So, we can write:

$z=y+2 \\ \\ 
-y+z=2$

Using these equations, we can set up the system of matrix as shown below in the image.

7 0

4 years ago

Read 2 more answers

Can someone help me on this? Quite lost

zloy xaker [14]

answer:

2. 3/2

1. y=-7

Step-by-step explanation:

6 0

3 years ago

What is the topic of an informational writing piece? (1 point) the subject or focus of your writing the formal meanings of words

Lyrx [107]

Answer:

Chapter 1. ... An expository essay allows the writer the opportunity to explain his or her ideas ... Facts. Explanations. Details. Definitions. It may also include the writer ... The first body section or paragraph should focus on one of your main points ... You will learn about the different ways to organize your body paragraphs in ...

Step-by-step explanation:

an error occurred while processing this directive] TIP Sheets > Writing Skills: Style, ... The main point of a piece of writing, often stated in a thesis statement or topic sentence. ... into a pattern or style; the way in which the content of writing is organized. ... and autobiographical information, often a source of ideas for writing.Whether you are messaging a colleague, writing to your manager, creating the ... may label and group the stages in various ways, the stages of the writing process are ... information to support or explain what you want to say about your subject, and ... in general at the beginning of prewriting before focusing on your topic.

t can be an individual object or a group of objects. ... As an information report is a factual piece of writing with a focus on attention to ... When putting together an information report you need to know your topic well so be ... should reinforce points made in the text, often in a condensed way. ... 1. Define the Scope of the Topic.

This step-by-step guide on expository writing includes expository essay ... Parents, does your student need assistance with writing an expository essay? ... of a subject based on facts—with no references to the writer's opinions or emotions. A typical expository writing prompt will use the words “explain” or “define,” such as in, ...

8 0

3 years ago

The mean number of words per minute (WPM) read by sixth graders is 84 with a standard deviation of 15 WPM. If 188 sixth graders

Anna007 [38]

Answer:

0.1836 = 18.36% probability that the sample mean would differ from the population mean by greater than 1.46 WPM

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

The mean number of words per minute (WPM) read by sixth graders is 84 with a standard deviation of 15 WPM.

This means that $\mu = 84, \sigma = 15$

Sample of 188

This means that $n = 188, s = \frac{15}{\sqrt{188}}$

What is the probability that the sample mean would differ from the population mean by greater than 1.46 WPM?

Greater than 84 + 1.46 = 85.46 or less than 84 - 1.46 = 82.54. Since the normal distribution is symmetric, these probabilities are equal, so we find one of them and multiply by 2.

Probability is is less than 82.54.

P-value of Z when X = 82.54. So

$Z = \frac{X - \mu}{\sigma}$

By the Central Limit Theorem

$Z = \frac{X - \mu}{s}$

$Z = \frac{82.54 - 84}{\frac{15}{\sqrt{188}}}$

$Z = -1.33$

$Z = -1.33$ has a p-value of 0.0918

2*0.0918 = 0.1836

0.1836 = 18.36% probability that the sample mean would differ from the population mean by greater than 1.46 WPM

3 0

3 years ago

What’s the answer pls help

IrinaVladis [17]

Answer:

C

Step-by-step explanation:

y=mx+b

m(slope)=rise/run=1

b(y intercept)=2

y=x+2

6 0

3 years ago