Math Review 7th Grade. 2 Parts

Mathematics

2 answers:

miv72 [106K]3 years ago

8 0

Here is the answer Ik 7th grade can be hard sometimes

Lisa [10]3 years ago

6 0

Answer:use a cac

Step-by-step explanation:i would do that but I’m verry busy so I would use a cac

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Find the unknow measures of y and x.

Yanka [14]

9514 1404 393

Answer:

x = 2 m

y = 30°

Step-by-step explanation:

The side lengths of ΔDEF are 3/9 = 1/3 of those of ΔABC.

x = DF = 1/3(AB) = (1/3)(6 m)

x = 2 m

Angle measures of ΔDEF are the same as those of the corresponding angles of ΔABC.

y = ∠B = ∠E = 30°

y = 30°

8 0

3 years ago

URGENTE, POR FAVOR

Firlakuza [10]

$\mathbf A=\begin{bmatrix}a_{1,1}&a_{1,2}\\a_{2,1}&a_{2,2}\end{bmatrix}$

$a_{i,j}=2i-j\implies\mathbf A=\begin{bmatrix}2\cdot1-1&2\cdot1-2\\2\cdot2-1&2\cdot2-2\end{bmatrix}=\begin{bmatrix}1&0\\3&2\end{bmatrix}$

Por la misma razón,

$\mathbf B=\begin{bmatrix}1-1&2-1\\1-2&2-2\end{bmatrix}=\begin{bmatrix}0&1\\-1&0\end{bmatrix}$

Entonces,

$4\mathbf A=\begin{bmatrix}4\cdot1&4\cdot0\\4\cdot3&4\cdot2\end{bmatrix}=\begin{bmatrix}4&0\\12&8\end{bmatrix}$

$\mathbf A-\mathbf B=\begin{bmatrix}1&0\\3&2\end{bmatrix}-\begin{bmatrix}0&1\\-1&0\end{bmatrix}=\begin{bmatrix}1-0&0-1\\3-(-1)&2-0\end{bmatrix}=\begin{bmatrix}1&-1\\4&2\end{bmatrix}$

$\mathbf B^\top=(b_{j,i})_{2\times2}=\begin{bmatrix}b_{1,1}&b_{2,1}\\b_{1,2}&b_{2,2}\end{bmatrix}=\begin{bmatrix}0&-1\\1&0\end{bmatrix}$

Yo no reconozco la notación "Ae"... Puedes explicarla?

$a_{1,1}\cdot b_{1,1}=1\cdot0=0$

$a_{2,2}\cdot b_{1,2}=2\cdot1=2$

6 0

3 years ago

The table shows a linear relationship between x and y. how can you tell that x and y are NOT porportianal

mote1985 [20]

If y/x does not always equal the same

6 0

3 years ago

60/100 is equivalent to what fraction ? Multiple choice.<br> 60/80<br> 6/10<br> 2/5<br> 4/5

aleksklad [387]

It's 6/10 because 60/100 is just a longer version of 6/10

3 0

3 years ago