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2 years ago

Plz help me i need help

Mathematics

1 answer:

hoa [83]2 years ago

6 0

Answer:

it's the last one it always helps me the way my teacher told me the short hand is the hour and the long one is the minutes. if you write the words down and draw a line under them it tells you which hand is which.

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Nostrana [21]

Answer:

525

Step-by-step explanation:

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3 years ago

A book is marked down by 28 percent from an original price of $19.50. What is the new price?

kupik [55]

Step-by-step explanation:

First find 28% of $19.50:

($19.50) / (100) × (28) = $5.46

Now minus the 285 from the original price:

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The answer is $14.04

Hope it helped :)

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3 years ago

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3 years ago

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Solve the system of equations using matrices. Use Gaussian elimination with back-substitution.

VikaD [51]

In augmented matrix form, the system is equivalent to

$\begin{bmatrix}1&1&1&-5\\1&-1&3&-1\\4&1&1&-2\end{bmatrix}$

Subtract row 1 from row 2, and 4(row 1) from row 3:

$\begin{bmatrix}1&1&1&-5\\0&-2&2&4\\0&-3&-3&18\end{bmatrix}$

Divide through row 2 by -2, and through row 3 by -3:

$\begin{bmatrix}1&1&1&-5\\0&1&-1&-2\\0&1&1&-6\end{bmatrix}$

Subtract row 2 from row 3:

$\begin{bmatrix}1&1&1&-5\\0&1&-1&-2\\0&0&2&-4\end{bmatrix}$

Divide through row 3 by 2:

$\begin{bmatrix}1&1&1&-5\\0&1&-1&-2\\0&0&1&-2\end{bmatrix}$

The last row tells you $\boxed{z=-2}$ . Then

$y-z=-2\implies y+2=-2\implies\boxed{y=-4}$

and

$x+y+z=-5\implies x-4-2=-5\implies\boxed{x=1}$

4 0

3 years ago

I should know how to do this but its spring break and im scared and bored 8th grade math

frozen [14]

Answer:

19 is B

Step-by-step explanation:

7/8 x 8x = 7x

7/8 x 16 = 14

8 0

2 years ago