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3 years ago

A) How many books were sold after 8 months?

Mathematics

1 answer:

irakobra [83]3 years ago

4 0

Maybe if you put a picture I could help you out

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I need help with this

erik [133]

Answer:

Female: 11

Male: 16

Total:

(1) 34

(2) 25

(3) 100

Step-by-step explanation:

Female:

45 - 18 - 16 = 11

Male:

55 - 25 - 14 = 16

Total:

(1) 18 + 16

(2) 14 + 11 = 25

(3) 45 + 55 =

8 0

2 years ago

Read 2 more answers

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

3 years ago

HELP ASAP please help I’ll mark as a brnlist

Mariana [72]

Answer:

Step-by-step explanation:

perpendicular (P) = 6

base (b) = 8

hypotenuse (h) =?

we know by using Pythagoras theorem,

h = $\sqrt{(p)^{2} + (b)^{2} } \\$

= $\sqrt{(6)^{2} + (8)^{2} } \\$

= 10

5 0

2 years ago

-8x-11x what is the answer

gregori [183]

Answer:

-19x

Step-by-step explanation:

so you start with -8 and when you subtract 11 from -8 its the same as adding them but because your subtracting you'll decrease which make the answer -19x. (hopefully this made sense)

7 0

2 years ago

Write an expression that evaluates to true if x is non-negative and y is negative?

joja [24]

Answer:

x >= 0 & y<0

x >= 0 means that x is non-negative

y<0 means that y is negative

6 0

1 year ago