I don't now what this is can any one help me

Mathematics

2 answers:

Nina [5.8K]3 years ago

7 0

So for the first one, you'll need to write out all the factors of both 30 and 16.
(30--1, 2, 3, 5, 6, 10, 15, 30)
(16--1, 2, 4, 8, 16)
The biggest number that goes into both 30 and 16 is 2.

For the second kne, its the same thing.
(48--1, 2, 3, 4, 6, 8, 12, 16, 24, 48)
(18--1, 2, 3, 6, 9, 18)
The biggest number that can go into both 48 and 18 is 6.

Hope this all helps!!

ASHA 777 [7]3 years ago

3 0

Forma The first numbers The common factores are 1 and 2 and forma the ladt numbers is 1,2,3, and 6 !!¡!

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3. Multiply the polynomials (a^2 + 3a – 4) and (2a^2 – a + 5). Simplify the answer. Show your work.

Elza [17]

Answer:

2a^4+5a^3-6a^2+19a-20

Step-by-step explanation:

(a^2+3a-4)(2a^2-a+5)

2a^4-a^3+5a^2+6a^3-3a^2+15a-8a^2+4a-20

2a^4-a^3+6a^3+5a^2-3a^2-8a^2+15a+4a-20

2a^4+5a^3+2a^2-8a^2+19a-20

2a^4+5a^3-6a^2+19a-20

8 0

3 years ago

The following table shows the percent increase of donations made on behalf of a non-profit organization for the period of 1984 t

pashok25 [27]

Giving the table below which shows the percent increase of donations made on behalf of a non-profit organization for the period of 1984 to 2003.

Year: 1984 1989 1993 1997 2001 2003

Percent: 7.8 16.3 26.2 38.9 49.2 62.1

The scatter plot of the data is attached with the x-axis representing the number of years after 1980 and the y-axis representing the percent increase of donations made on behalf of a non-profit organization.

To find the equation for the line of regression where the x-axis representing the number of years after 1980 and the y-axis representing the percent increase of donations made on behalf of a non-profit organization.
$\begin{center}
\begin{tabular}{ c| c| c| c| }
 x & y & x^2 & xy \\ [1ex] 
 4 & 7.8 & 16 & 31.2 \\ 
 9 & 16.3 & 81 & 146.7 \\ 
13 & 26.2 & 169 & 340.6 \\ 
17 & 38.9 & 289 & 661.3 \\ 
21 & 49.2 & 441 & 1,033.2 \\ 
23 & 62.1 & 529 & 1,428.3 \\ [1ex]
\Sigma x=87 & \Sigma y=200.5 & \Sigma x^2=1,525 & \Sigma xy=3,641.3 
\end{tabular}
\end{center}$

Recall that the equation of the regression line is given by
$y=a+bx$
where
$a= \frac{(\Sigma y)(\Sigma x^2)-(\Sigma x)(\Sigma xy)}{n(\Sigma x^2)-(\Sigma x)^2} = \frac{200.5(1,525)-87(3,641.3)}{6(1,525)-(87)^2} \\ \\ = \frac{305,762.5-316793.1}{9,150-7,569} = \frac{-11,030.6}{1,581} =-6.977$
and
$b= \frac{n(\Sigma xy)-(\Sigma x)(\Sigma y)}{n(\Sigma x^2)-(\Sigma x)^2} = \frac{6(3,641.3)-(87)(200.5)}{6(1,525)-(87)^2} \\ \\ = \frac{21,847.8-17,443.5}{9,150-7,569} = \frac{4,404.3}{1,581} =2.7858$

Thus, the equation of the regresson line is given by
$y=-6.977+2.7858x$

The graph of the regression line is attached.

Using the equation, we can predict the percent donated in the year 2015. Recall that 2015 is 35 years after 1980. Thus x = 35.

The percent donated in the year 2015 is given by
$-6.977+2.7858(35)=-6.977+97.503=90.526$

Therefore, the percent donated in the year 2015 is predicted to be 90.5

7 0

3 years ago

Complete the sentence to explain how to use mental math to express 12/25 as a percent

Vlada [557]

Answer: It's 48%. See below.

Step-by-step explanation:

By definition, percent means out of a hundred. For instance, 10 percent is 10 out of 100.

One way to make $\frac{12}{25}$ a percent is by making the denominator 100. In order to do so, multiply the numerator and the denominator by 4, since 25 times 4 is 100.