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Stells [14]
3 years ago
8

Seventh grade

Mathematics
1 answer:
alexandr402 [8]3 years ago
6 0

Answer:

$690.86

Step-by-step explanation:

100% from the original cost is: 2 x 863.57 = $1,727.14

40/100 = X/1727.14 (40 percent is what of 1,727.40) (%/100 = is/of)

(40 * 1,727.14) / 100 = $ 690.86

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A 135-page notebook has 33 writing lines on each page. What is the total number of writing lines in the entire notebook
ladessa [460]

Answer:

4455

Step-by-step explanation:

135 pages x 33 lines a page = 4455 lines.

6 0
2 years ago
What is the quadratic regression equation for the data set? ​ ​ ​ <br><br> PLEASEE HELP ME
Soloha48 [4]
You're trying to find constants a_0,a_1,a_2 such that \hat y=a_0+a_1\hat x+a_2{\hat x}^2. Equivalently, you're looking for the least-square solution to the following matrix equation.


\underbrace{\begin{bmatrix}1&6&6^2\\1&3&3^2\\\vdots&\vdots&\vdots\\1&9&9^2\end{bmatrix}}_{\mathbf A}\underbrace{\begin{bmatrix}a_0\\a_1\\a_2\end{bmatrix}}_{\mathbf x}=\underbrace{\begin{bmatrix}100\\110\\\vdots\\70\end{bmatrix}}_{\mathbf b}

To solve \mathbf{Ax}=\mathbf b, multiply both sides by the transpose of \mathbf A, which introduces an invertible square matrix on the LHS.

\mathbf{Ax}=\mathbf b\implies\mathbf A^\top\mathbf{Ax}=\mathbf A^\top\mathbf b\implies\mathbf x=(\mathbf A^\top\mathbf A)^{-1}\mathbf A^\top\mathbf b

Computing this, you'd find that

\mathbf x=\begin{bmatrix}a_0\\a_1\\a_2\end{bmatrix}\approx\begin{bmatrix}121.119\\-3.786\\-0.175\end{bmatrix}

which means the first choice is correct.
8 0
4 years ago
Find the value of x. * 7x-1 + 6x-1 = 180
Len [333]
I believe the answer is x=14
6 0
3 years ago
Read 2 more answers
-1/4×3/5×-2/5 what dose this Equal​
kipiarov [429]

Answer would be 3/50

5 0
3 years ago
A:b = 7:4, b:c = 2:5 . Work out a:c, give your answer in its simplest form.
xeze [42]

Answer:

7 : 10

Step-by-step explanation:

Refer to attachment.

<em>Hope</em><em> </em><em>it</em><em> </em><em>helps</em><em>.</em>

4 0
2 years ago
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