Ask question

Ask question

All categories

3 years ago

9

Please I need help with just 1 and 2 please!!!

1 answer:

jonny [76]3 years ago

7 0

The ratio of girls to boys is:
$\frac{number \: of \: girls}{number \: of \: boys} = \frac{10}{15} = \frac{2}{3}$
the ratio of striped ties to to solid ties is:
$\frac{number \: of \: striped \: ties}{number \: of \: solid \: ties} = \frac{7}{21} = \frac{1}{3}$

You might be interested in

14.371 value of 1 in decimal form

artcher [175]

0.001. hope that helped

7 0

4 years ago

A wire 4 1/2 feet long is being cut into smaller pieces of wire, each 1 1/4 feet long. What is the maximum number of smaller pie

Neko [114]

Answer 4.6 ft

Step-by-step explanation:

5 0

3 years ago

An advertising company designs a campaign to introduce a new product to a metropolitan area of population 3 Million people. Let

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

Which pair of angles are congruent or supplementary

Fittoniya [83]

Angles 1 and 3 are supplementary

6 0

3 years ago

Need help please and thanks

Dennis_Churaev [7]

1 parallelogram
2 parallelogram
3 rhombus
4 rectangle
5 rhombus

6 0

3 years ago