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3 years ago

Question 3 please! Thanks.

Mathematics

1 answer:

Ugo [173]3 years ago

5 0

I haven't done this in a while but I think the answer is 16

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What is a area of a figure with 9.9 3.3 5.4

Helga [31]

9*9=81
3*3=9
5*4=20
20+9=29
29+81=110 final answer

3 0

3 years ago

if bill puts $3,500 into an account that has a 2.5% interest rate compounded annually, how much money will bill have after 3 yea

lyudmila [28]

Answer:

$26,250

Step-by-step explanation:

$3,500×(2.5)^3

8 0

3 years ago

12(x-6)and 14(x+14).<br><br> plz help

il63 [147K]

Answer:

138 and 210?

Step-by-step explanation:

8 0

3 years ago

How can you compare two ratios that are in fractional and percent form?

timofeeve [1]

Ratio is just a single fraction. Whereas proportion is a ratio between 2 fractions. The basic difference is Ratio is always with respect to some large quantities or superior quantities, whereas proportion is between same kind of quantities.

4 0

3 years ago

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