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3 years ago

Help pls!! the problem is in the picture

Mathematics

1 answer:

Neko [114]3 years ago

3 0

Answer:

Step-by-step explanation:

THIS IS THE TRUE ANSWER B.READ CAREFULLY

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The percent increase from 18 to 26 is about...?

Shalnov [3]

Answer:

≈44.44%

Step-by-step explanation:

≈44.44%

To solve this, we can use a simple proportion.

Assuming 18 = 100%...

$\frac{18}{100}=\frac{26}{x}$

Then, using cross multiplication...

$18x=100(26)$

$18x=2600$

Now divide 18 from both sides.

x ≈ 144.44

Now subtract 100 from ≈144.44, leaving us with

≈44.44%

3 0

3 years ago

Write 0.0000002711 in scientific notation. (Use 2 numbers after the decimal point.)

Anestetic [448]

Answer: 2711×10^-10

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

The data below represent the number of days absent, x, and the final grade, y, for a sample of college students at a large uni

Zina [86]

Answer:

The equation of the regression line is: $y~=~88.518 ~-~ 3.068 \cdot x$

Step-by-step explanation:

Linear regression is a linear approach to modelling the relationship between a dependent variable and one or more independent variables.

Let X be the independent variable and Y be the dependent variable. We will define a linear relationship between these two variables as follows:

$Y=bX+a$

We have the the following data:

$\begin{array}{c|cccccccccc}No. \:of \:absences,\:x&0&1&2&3&4&5&6&7&8&9\\Final \:grade, y&88.5&85.7&82.8&80.3&77.4&73.1&63.6&68.1&65.2&62.4\end{array}$

To find the line of best fit for the points, follow these steps:

Step 1: Find $X\cdot Y$ and $X\cdot X$ as it was done in the table.

Step 2: Find the sum of every column:

$\sum{X} = 45 ~,~ \sum{Y} = 747.1 ~,~ \sum{X \cdot Y} = 3108.8 ~,~ \sum{X^2} = 285$

Step 3: Use the following equations to find intercept a and slope b:

$\begin{aligned} a &= \frac{\sum{Y} \cdot \sum{X^2} - \sum{X} \cdot \sum{XY} }{n \cdot \sum{X^2} - \left(\sum{X}\right)^2} = \frac{ 747.1 \cdot 285 - 45 \cdot 3108.8}{ 10 \cdot 285 - 45^2} \approx 88.518 \\ \\b &= \frac{ n \cdot \sum{XY} - \sum{X} \cdot \sum{Y}}{n \cdot \sum{X^2} - \left(\sum{X}\right)^2} = \frac{ 10 \cdot 3108.8 - 45 \cdot 747.1 }{ 10 \cdot 285 - \left( 45 \right)^2} \approx -3.068\end{aligned}$

Step 4: Assemble the equation of a line

$\begin{aligned} y~&=~a ~+~ b \cdot x \\y~&=~88.518 ~-~ 3.068 \cdot x\end{aligned}$

The graph of the regression line is:

4 0

3 years ago

What would be the dimesions of the pool if the length is 15 feet longer then the width and they put up an 110 feet of fence arou

Setler79 [48]

Answer: Use Gauth Math. What is the topic about?

Step-by-step explanation:

3 0

3 years ago

Which functions have real zeros at 1 and 4? Check all that apply.

erastova [34]

$f(x)=x^2+x+4=0\ \text{NO SOLUTIONS}\ :(\\\\f(x)=x^2-5x+4=x^2-4x-x+4=x(x-4)-1(x-4)\\=(x-4)(x-1)=0\iff x=4\ \vee\ x=1\ \text{CORRECT}\\\\f(x)=x^2+3x-4=x^2+4x-x-4=x(x+4)-1(x+4)\\=(x+4)(x-1)=0\iff x=-4\ \vee\ x=1\ :($

$f(x)=-2x^2+10x-8=-2(x^2-5x+4)=-2(x^2-4x-x+4)=\\-2[x(x-4)-1(x-4)]=-2(x-4)(x-1)=0\iff x=4\ \vee\ x=1\ \text{CORRECT}\\\\f(x)=-4x^2-16x-1\to f(1)=-4\cdot1^2-16\cdot1-1=-4-16-1=-21\neq0\ :($

Answer:
$\boxed{f(x)=x^2-5x+4\ and\ f(x)=-2x^2+10x-8}$

5 0

4 years ago

Read 2 more answers