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3 years ago

The box plots below show the average daily temperatures in January and December for a U.S.

Mathematics

1 answer:

Marysya12 [62]3 years ago

3 0

Answer:

The answer is C

Step-by-step explanation:

Took the test!

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What is -2 and 2 fifths squared?<br><br> Thanks!

Luba_88 [7]

Answer:

$\frac{144}{25}$

Step-by-step explanation:

We begin with $(-2 \frac{2}{5} )^2$

First, lets turn this mixed number into an improper fraction/

$-2 \frac{2}{5} =-\frac{12}{5}$

Now that we have this, we can square it and then simplify it.

$(-\frac{12}{5} )^2 =\frac{12^2}{5^2} *(-1)^2=\frac{144}{25} *1=\frac{144}{25}$

3 0

3 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

$12,000 at 13% for 2years

Mademuasel [1]

Answer:

The interest is $3120 and the amount is $15120.

Step-by-step explanation:

Hope this helped

5 0

4 years ago

What is the simplest form of 50/8?

lions [1.4K]

6 1/4 or 6.25 or 25/4

3 0

4 years ago

Read 2 more answers

Find the sum of all numbers 1 to 1000

Novay_Z [31]

Answer:

it is 500500

Step-by-step explanation:

learned this fact a few years ago and it stuck with me.

8 0

3 years ago