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2 years ago

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Mathematics

2 answers:

grigory [225]2 years ago

6 0

Answer:

Step-by-step explanation:

2x-5

A, B, C, E All but the 4th one

timurjin [86]2 years ago

3 0

Answer:A, B, C, E

Step-by-step explanation:

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The exponential modeled below represents the number of bacteria growing after a certain number or hours has passed.

lorasvet [3.4K]

Answer:

I would say D because if you count how much they go up it's close. but if you dont agree I could also assume B.

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3 years ago

In a study relating the degree of warping, in mm, of a copper plate (y) to temperature in °C (x), the following summary statisti

kipiarov [429]

Answer:

The error sum of squares is SSE=12.97

The regression sum of squares is SSR=6.430

The total sum of squares is SST=19.4

Step-by-step explanation:

Linear regression is a way "to modeling the relationship between a scalar response (or dependent variable) and one or more explanatory variables (or independent variables)".

Regression estimates are "used to describe data and to explain the relationship between one dependent variable and one or more independent variables"

The linear model is given by the following equation $Y=mx +b$ , where y is the dependent variable, x the independent variable, m the slope and b the intercept.

For this case we have the following info given:

$\sum_{i=1}^n (x_i -\bar x)^2 =98775$

$\sum_{i=1}^n (y_i -\bar y)^2 =19.4$

$\bar x =26.36$

$\bar y =0.5188$

n= 40 represent the sample size

$\sum_{i=1}^n (x_i -\bar x)(y_i -\bar y) =796.94$

The total sum of squares is given by this formula:

$SST= \sum_{i=1}^n (y_i -\bar y)^2 =19.4$

And from the formulas for a simple regression, we need to calculate the slope for the regression like this:

$m=\frac{\sum_{i=1}^n (x_i -\bar x)(y_i -\bar y)}{\sum_{i=1}^n (x_i -\bar x)^2}$

And if we replace the values given we have:

$m=\frac{796.94}{98775}=0.008068$

We have another useful equation in order to find the sum of squares for the regression, given by:

$SSR=m* \sum_{i=1}^n (x_i -\bar x)(y_i -\bar y)=0.008068*796.94=6.430$

And we know this equivalence:

$SST= SSR+SSE$

And solving for the sum of squares for the error we have:

$SSE=SST-SSR=19.4-6.430=12.97$

So then we have the final solutions:

The error sum of squares is SSE=12.97

The regression sum of squares is SSR=6.430

The total sum of squares is SST=19.4

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3 years ago

30% of 20 30% of 30 30% of 40

Allushta [10]

20X0.3= 6
30X0.3= 9
40X0.3= 12

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3 years ago

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A trinomial is a polynomial with three terms. It can be determined if it is a difference of two squares when you factor it.

The resulting factor of a trinomial that is a difference of two squares is: a² – b² = (a + b)(a – b) or (a – b)(a + b)

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3 years ago

Bruce owns a small grocery store and charges $3.50 per pound of produce. If a customer orders 3 pounds of produce, how much does

Anit [1.1K]

3.50(p)
3.50 (3)
Pounds=3^
Answer: Bruce should charge the customer $10.50 for the customers purchase.

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3 years ago

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