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4 years ago

Is my answer correct or incorrect? Explain please. Thank you

Mathematics

2 answers:

Ber [7]4 years ago

8 0

3 sandwich choices
2 side item choices
4 beverage choices

Let's say the sandwich choices were PB&J, Ham, and Turkey
Let's say the sides were fries and mandarin oranges
Let's say the beverages were water, orange juice, milk, soda

PB&J
Ham
Turkey

Fries
Mandarin Oranges

Water
OJ
Milk
Soda

The combinations can be as follows:

PB&J, Fries, Water
PB&J, Fries, OJ
PB&J, Fries, Milk
PB&J, Fries, Soda
PB&J, Mandarin Oranges, Water
PB&J, Mandarin Oranges, OJ
PB&J, Mandarin Oranges, Milk
PB&J, Mandarin Oranges, Soda
Ham, Fries, Water
Ham, Fries, OJ
Ham, Fries, Milk
Ham, Fries, Soda
Ham, Mandarin Oranges, Water
Ham, Mandarin Oranges, OJ
Ham, Mandarin Oranges, Milk
Ham, Mandarin Oranges, Soda
Turkey, Fries, Water
Turkey, Fries, OJ
Turkey, Fries, Milk
Turkey, Fries, Soda
Turkey, Mandarin Oranges, Water
Turkey, Mandarin Oranges, OJ
Turkey, Mandarin Oranges, Milk
Turkey, Mandarin Oranges, Soda

So your answer is correct: There's 24 lunch combinations that can be made.

Hope that helps!

True [87]4 years ago

4 0

Yes because 3 * 2 * 4 = 24

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sweet-ann [11.9K]

The X-intercept (-250, 0)

The Y-intercept (0, 100)

These are the Y and X intercepts because this the first time the line intercepts. I hope I explained it well...

Have a good day!

7 0

3 years ago

What is 54% of 250 i need help plz help

poizon [28]

Answer:

135

Step-by-step explanation

Turn 54% into a decimal so it would be like 0.54

Then multiply 250 by 0.54 to get 54% of the number.

7 0

2 years ago

Read 2 more answers

1. What is AD/AB in simplest form

Step2247 [10]

This is the concept of algebra: The answers to the questions will be as follows:
1. What is AD/AM in the simplest form:
AD/AB is the ratio of AD to AB. This will calculated as follows:
AD=9 units
AB=3 units
thus:
9/3=3
Hence, we conclude that the answer is D. 3

2] What is slope of BE/ slope of AE in simplest form:
slope=(Δy-axis)/(Δx-axis)
slope of AE
=(5-0)/(4-0)
=5/4
slope BE
slope=(5-0)/(4-3)=5/1=5
therefore the ratio of the two slope will be:
BE/AE
=5/(5/4)
=4
The answer is A.4

3. What is the value of x in the proportion (x-1)/5=(4x+2)/35?
To get the value of x we solve the above proportion:
(x-1)/5=(4x+2)/35
35(x-1)=5(4x+2)
35x-35=20x+10
putting like terms together we get:
35x-20x=10+35
15x=45
dividing both sides by 15
x=45/15
x=3
Hence the answer is B.3

4. What is the value of x in the proportion:
(x+1)/(x+3)=15/21
to get the value of x we solve the above:
first we begin by cross multiplying the proportion, this will give us:
21(x+1)=15(x+3)
21x+21=15x+45
putting like terms together we get:
21x-15x=45-21
6x=24
dividing both sides by 6 we get
x=4
∴ x=4

5. The lengths of the sides of a triangle are in extended ratio 3:10:12. The perimeter is 400 cm. What is the length of the longest side in cm.
solution:
Here we introduce the variable x such that the perimeter is:
3x+10x+12x=400
25x=400
x=400/25
x=16
The longest side will be:
12×16=192 cm

6 0

4 years ago

Read 2 more answers

A study was conducted to determine whether the final grade of a student in an introductory psychology course is linearly related

Nat2105 [25]

Answer:

a) In order to calculate the correlation coefficient we can use this formula:

$r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}$

And replacing we got:

$r=0.598$

b) $S_{xx}=\sum_{i=1}^n x^2_i -\frac{(\sum_{i=1}^n x_i)^2}{n}=31911-\frac{541^2}{10}=2642.9$

$S_{xy}=\sum_{i=1}^n x_i y_i -\frac{(\sum_{i=1}^n x_i)(\sum_{i=1}^n y_i){n}}=43033-\frac{541*777}{10}=997.3$

And the slope would be:

$m=\frac{997.3}{2642.9}=0.377$

Nowe we can find the means for x and y like this:

$\bar x= \frac{\sum x_i}{n}=\frac{541}{10}=54.1$

$\bar y= \frac{\sum y_i}{n}=\frac{777}{10}=77.7$

And we can find the intercept using this:

$b=\bar y -m \bar x=77.7-(0.377*54.1)=57.30$

So the line would be given by:

$y=0.377 x +57.30$

c) For this case if we use the score for the 9th student we got:

$y= 0.377* 46 +57.30 =74.642$

And the residual is given by:

$e= \hat y_i -y_i = 74.642-61=13.542$

Step-by-step explanation:

Part a

In order to calculate the correlation coefficient we can use this formula:

$r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}$

And replacing we got:

$r=0.598$

Part b

We need to find a model like this one:

$Y = mx +b$

$m=\frac{S_{xy}}{S_{xx}}$

Where:

$S_{xy}=\sum_{i=1}^n x_i y_i -\frac{(\sum_{i=1}^n x_i)(\sum_{i=1}^n y_i)}{n}$

$S_{xx}=\sum_{i=1}^n x^2_i -\frac{(\sum_{i=1}^n x_i)^2}{n}$

With these we can find the sums:

$S_{xx}=\sum_{i=1}^n x^2_i -\frac{(\sum_{i=1}^n x_i)^2}{n}=31911-\frac{541^2}{10}=2642.9$

$S_{xy}=\sum_{i=1}^n x_i y_i -\frac{(\sum_{i=1}^n x_i)(\sum_{i=1}^n y_i){n}}=43033-\frac{541*777}{10}=997.3$

And the slope would be:

$m=\frac{997.3}{2642.9}=0.377$

Nowe we can find the means for x and y like this:

$\bar x= \frac{\sum x_i}{n}=\frac{541}{10}=54.1$

$\bar y= \frac{\sum y_i}{n}=\frac{777}{10}=77.7$

And we can find the intercept using this:

$b=\bar y -m \bar x=77.7-(0.377*54.1)=57.30$

So the line would be given by:

$y=0.377 x +57.30$

Part c

For this case if we use the score for the 9th student we got:

$y= 0.377* 46 +57.30 =74.642$

And the residual is given by:

$e= \hat y_i -y_i = 74.642-61=13.542$

4 0

3 years ago

designer ceramic tiles including instillation cost 99.99 a yard if jan buys 15.5 yards how much will it cost her?

allsm [11]

1,549.845 because 99.99 x 15.5 is 1,549.845

4 0

4 years ago