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3241004551 [841]
3 years ago
12

Pls help me in this math question I hope I need help pls which one?​

Mathematics
1 answer:
oksano4ka [1.4K]3 years ago
8 0

Answer:

Step-by-step explanation:

D)3*2+5*2=6+10=16

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Transfer transfer the system of equations by forming a matrix equation.
Anika [276]

Answer:

Step-by-step explanation:

\begin{bmatrix}2 & -3\\ 1 & 2\end{bmatrix}^{-1}\times \begin{bmatrix}2 & -3\\ 1 & 2\end{bmatrix}\times \begin{bmatrix}x\\y \end{bmatrix}=\frac{1}{7} \begin{bmatrix}2  & 3 \\ -1 & 2\end{bmatrix}\times \begin{bmatrix}19\\ -1\end{bmatrix}  

Since, \begin{bmatrix}2 & -3\\ 1 & 2\end{bmatrix}^{-1}=\frac{1}{7}\begin{bmatrix}2 & 3\\ -1 & 2\end{bmatrix}

And A^{-1}A=I

\begin{bmatrix}x\\y \end{bmatrix}=\frac{1}{7}\begin{bmatrix}2 & 3\\ -1 & 2\end{bmatrix}\times \begin{bmatrix}19\\-1 \end{bmatrix}

\begin{bmatrix}x\\y \end{bmatrix}=\frac{1}{7}\begin{bmatrix}35\\ -21\end{bmatrix}

\begin{bmatrix}x\\y \end{bmatrix}=\begin{bmatrix}5\\ -3\end{bmatrix}                

Therefore, x = 5 and y = -3 will be the value of variables.

3 0
3 years ago
Jonathan can jog 3 2/5 miles in 7/8 hours find his average speed in miles per hour
il63 [147K]

D=  3 2/5=3.4m T= 7/8 = 0.875h Use   v = d / t.  V= 3.4/0.875 V=3.866 mph

4 0
4 years ago
The product of c and 2 is greater than or equal to 20
avanturin [10]

The product of c and 2 is greater than or equal to 20


c*2 >=20

divide by 2

c>=10

8 0
3 years ago
Kyle saved $500 from a summer job. HE spend 10% of his remaining savings each week. How much will Kyle have after 15 weeks?
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Well first I think you have to do 500-10%=450 Then I think you do 450x15=6750 I hope this helps. :) 

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3 years ago
Suppose that hot dogs come in packs of 9 and buns come in packs of 12 . kareem bought the same number of hot dogs as buns. it wa
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Hot dogs- 4 packs (9 times 4 = 36)
Buns - 3 packs (12 times 3 = 36)
4 0
4 years ago
Read 2 more answers
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