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2 years ago

7

I’m confuseddddd and need in help :)))

2 answers:

solong [7]2 years ago

8 0

Answer:

Step-by-step explanation:

this is a difference of two squares.. so you need a changing sign in the two parenthesis ( - ) ( + ) like that form and you'll need two 5 and two 8 each with an x and y sooo B looks pretty good

Natasha2012 [34]2 years ago

4 0

Answer:

The answer is B

Explanation:

You will basically just have to do distribute so you have to do 5x times 5x which would be 25x^2 and then -8y times 8y which would be -64y^2

Hope this helps!!

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Advocard [28]

Answer:

$P(t)=3,000,000-3,000,000e^{0.0138t}$

Step-by-step explanation:

Since P(t) increases at a rate proportional to the number of people still unaware of the product, we have

$P'(t)=K(3,000,000-P(t))$

Since no one was aware of the product at the beginning of the campaign and 50% of the people were aware of the product after 50 days of advertising

<em>P(0) = 0 and P(50) = 1,500,000 </em>

We have and ordinary differential equation of first order that we can write

$P'(t)+KP(t)= 3,000,000K$

The <em>integrating factor </em>is

$e^{Kt}$

Multiplying both sides of the equation by the integrating factor

$e^{Kt}P'(t)+e^{Kt}KP(t)= e^{Kt}3,000,000*K$

Hence

$(e^{Kt}P(t))'=3,000,000Ke^{Kt}$

Integrating both sides

$e^{Kt}P(t)=3,000,000K \int e^{Kt}dt +C$

$e^{Kt}P(t)=3,000,000K(\frac{e^{Kt}}{K})+C$

$P(t)=3,000,000+Ce^{-Kt}$

But P(0) = 0, so C = -3,000,000

and P(50) = 1,500,000

so

$e^{-50K}=\frac{1}{2}\Rightarrow K=-\frac{log(0.5)}{50}=0.0138$

And the equation that models the number of people (in millions) who become aware of the product by time t is

$P(t)=3,000,000-3,000,000e^{0.0138t}$

5 0

3 years ago

How can the mean of the values in a numerical data set be calculated?

Kruka [31]

Answer:

C

Step-by-step explanation:

Mean is the average. To find mean, add all the numbers in a data set, then divide by the number of values.

Example: 1,2,3,4,5

Mean: 1+2+3+4+5= 15

Number of values: 5

15/5 = 3

Mean is 3

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Answer:

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A=7yd^2

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where C is total cost.

C=7yd^2•($21+$5)/yd^2

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