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Airida [17]
3 years ago
5

I don't understand 17 or18 plz help I need it by tonight

Mathematics
1 answer:
jarptica [38.1K]3 years ago
5 0
I got the answers hopefully okay #17 is 8 times 4 makes 32 biscuits so multiply 2x4 and you get 8 cups of flour #18 A is true B is false C is false and D is true
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Find the surface area of a hexagonal prism if the length of each side of the hexagonal base is 4 cm and the height is 7 cm.
olya-2409 [2.1K]

The surface area of a hexagonal prism willl be 251.13844 cm².

<h3>What is the surface area?</h3>

The total land area of all the faces of a three-dimensional object is its surface area. When we wish to wrap something in real life, we employ the notion of surface areas of distinct things.

A=6ah+3√3a²

A=6×4×7+3√3×4²

A≈251.13844

Hence the surface area of a hexagonal prism willl be 251.13844 cm².

To learn more about the surface area, refer to the link;

brainly.com/question/2835293

#SPJ1

3 0
2 years ago
If the coefficient of determination is 0.25 and the sum of squares residual is 180, then what is the value of SSY?
Gennadij [26K]

Answer:

And then SSY=SS_{total}=\sum_{j=1}^n (y_j-\bar y)^2 =240  

C. 240

Step-by-step explanation:

Previous concepts

Analysis of variance (ANOVA) "is used to analyze the differences among group means in a sample".  

The sum of squares "is the sum of the square of variation, where variation is defined as the spread between each individual value and the grand mean"  

When we conduct a multiple regression we want to know about the relationship between several independent or predictor variables and a dependent or criterion variable.

If we assume that we have k independent variables and we have  j=1,\dots,j individuals, we can define the following formulas of variation:  

SS_{total}=\sum_{j=1}^n (y_j-\bar y)^2  

SS_{regression}=SS_{model}=\sum_{j=1}^n (\hat y_{j}-\bar y)^2  

SS_{error}=\sum_{j=1}^n (y_{j}-\hat y_j)^2 =180  

And we have this property  

SST==SSY=SS_{regression}+SS_{error}=SSR+180

If we solve for SSR we got:

SSR= SSY-180    (1)

And we know that the determination coefficient is given by:

R^2 = \frac{SSR}{SSY}

We know the value os R^2= 0.25 and we can replace SSR in terms of SSY with the equation (1)  

R^2 =0.25= \frac{SSY-180}{SSY}= 1-\frac{180}{SSY}

And solving SSY we got:

\frac{180}{SSY}=1-0.25=0.75

SSY= \frac{180}{0.75}=240

And then SSY=SS_{total}=\sum_{j=1}^n (y_j-\bar y)^2 =240  

C. 240

7 0
3 years ago
An 8-foot by 5-foot section of wall is to be covered by square tiles that measure 4 inches on each side. If the tiles are not cu
ExtremeBDS [4]

Answer:

30 tiles

Step-by-step explanation:

SO we need to find the area of the wall so we do

8 feet * 5 feet = 40 feet squared

then we find that area in inches

40*12=480

Now we find the area of the tiles

4*4=16

So now we divide to find how many tiles are needed

480/16=30

Our answer is 30

6 0
3 years ago
Debbie cut cord to sixths she is five of the pieces to make necklaces she used equal length of the remaining cord for each of fo
Anettt [7]

Answer:

¹/₂₄  

Step-by-step explanation:

Debbie used ⅚ of the cord for necklaces.

That left ⅙ of the cord for four bracelets.

Each bracelet used:

Fraction of cord = ⅙ ×¼ = ¹/₂₄

Debbie used ¹/₂₄ of the cord for each bracelet.

7 0
3 years ago
Aaron and his friends went trick or
sergeinik [125]

Answer:

4.472

Step-by-step explanation:

So we just have to divide

22.36 / 5 = 4.472

6 0
3 years ago
Read 2 more answers
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