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2 years ago

9

The height of a right cylinder is 3r , where r is the radius. Write a function f in simplest form that represents the ratio of t

he volume to the surface area.
f ( r ) =

1 answer:

son4ous [18]2 years ago

7 0

Answer:

I think it's 9 again I think

Step-by-step explanation:

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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

BRAINLIEST ASAP!!!!

ivanzaharov [21]

The graph of a quadratic equation is a U-shaped curved called parabola. It is because the parabola makes very easy to find the axis of symmetry to plot selected points and finding the roots and vertex.

Good luck :)

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2 years ago

An expression is shown 342 / 8 What is the quotient expressed as a fraction?

tekilochka [14]

/ also means division so the answer is 42.75

5 0

3 years ago

I need all 5 of them please

aliina [53]

1.) 8.88= 4.44 (x -7)
8.88 = 4.44x - 31.08
+31.08 +31.08
39.96 = 4.44x
39.96 / 4.44x
9 = x

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2 years ago

Read 2 more answers

A salesperson at a jewelry store earns 7% commission each week. Lat week, Heidi sold 450$ worth of jewelry. How much did she mak

Lemur [1.5K]

Step-by-step explanation:

$31.50 is how much she made

418.5 is how much the store made, but, that is the simple value, there could be more variables

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2 years ago