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3 years ago

Item 9

Mathematics

1 answer:

kari74 [83]3 years ago

8 0

Answer:

25x=320=12.8

Step-by-step explanation:

a number=x

x*25=25x

25x=320

320/25= 12.8

x=12.8

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Evaluate UV if possible.

Mnenie [13.5K]

Answer: B

Step-by-step explanation:

Multiply U and V:

$\begin{pmatrix}-9&1&0\\ \:4&0&2\\ \:0&1&5\end{pmatrix}\begin{pmatrix}2\\ \:-2\\ \:1\end{pmatrix}$

$\mathrm{Multiply \ the \ rows \ of \ the \ first \ matrix \ by \ the \ columns \ of \ the \ second \ matrix:}$

$\begin{aligned}&\left(\begin{array}{ccc}-9 & 1 & 0\end{array}\right)\left(\begin{array}{c}2 \\-2 \\1\end{array}\right)=(-9) \cdot 2+1 \cdot(-2)+0 \cdot 1 \\&\left(\begin{array}{ccc}4 & 0 & 2\end{array}\right)\left(\begin{array}{c}2 \\-2 \\1\end{array}\right)=4 \cdot 2+0 \cdot(-2)+2 \cdot 1 \\&\left(\begin{array}{lll}0 & 1 & 5\end{array}\right)\left(\begin{array}{c}2 \\-2 \\1\end{array}\right)=0 \cdot 2+1 \cdot(-2)+5 \cdot 1\end{aligned}$

$=\begin{pmatrix}\left(-9\right)\cdot \:2+1\cdot \left(-2\right)+0\cdot \:1\\ 4\cdot \:2+0\cdot \left(-2\right)+2\cdot \:1\\ 0\cdot \:2+1\cdot \left(-2\right)+5\cdot \:1\end{pmatrix}$

$\mathrm{Simplify\:each\:part:}$

$=\begin{pmatrix}-20\\ 10\\ 3\end{pmatrix}$

Therefore, the correct answer is B

5 0

3 years ago

In the magic square shown, the sums of the numbers in each row, column and diagonal are the same. What are the values of x, y, z

garri49 [273]

$v=23$ , $w=19$ , $x=22$ , $y=26$ , $z=20$ ;; to find the answer, set the expressions equal to each other, since the sum of the numbers should be the same.

Use $v+w+24=v+43$ and solve for $w$ , which would result in $w=19$ .

You can also use $x+z+24=z+46$ to find $x$ – or $x=22$ .

Plug in the values for $x$ and $w$ , and find $y$ using $25+22+19=y+40$ or $66=y+40$ and results in $y=26$ .

After plugging in the $y$ value, you can easily find $v$ and $z$ .

$v+18+25=66$ – since 66 is the sum of a full row, and the sums of the numbers in each row, column, and diagonal are the same, so therefore, $v+43$ should also equal 66. This results in $v=23$ , and, using the same value for the sum of $z+21+25$ , or $z+46=66$ , we find that $z=20$ .

The final answer is $v=23$ , $w=19$ , $x=22$ , $y=26$ , $z=20$ .

Sorry it took so long;; I hope this helps :)

5 0

4 years ago

Ray had $50. he bought two shirts that cost $19 each. how much money did Ray have after buying the shirts? Alex's answer to the

EastWind [94]

no why? cause the guy bought 2 shirts for 19 dollors each where was he at nikes? on average a shirt cost 15 bucks but 19? yeah no

6 0

2 years ago

Read 2 more answers

Any one knows the answer to this

timurjin [86]

Answer:

Slope-point form or "Point-Slope form"

Step-by-step explanation:

I hope this helped, good luck!

5 0

3 years ago

To solve the problem. A Jar contains n nickels and d dimes. There are 22 coins in the jar, and the total value of the coins is $

lbvjy [14]

Answer:

there are 10 dimes ans 8 nickels is the only wait i can think of to get $1.40.

Step-by-step explanation:

5 0

3 years ago