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2 years ago

Can someone pls help need it ASAP :) it is not x=-13.4, y=-3.2

Mathematics

1 answer:

IRINA_888 [86]2 years ago

8 0

Answer:

x = -9

y = 2

Step-by-step explanation:

x + y = -7 then x = -y - 7

-x + 4y = 17

substitute for x:

-(-y - 7) + 4y = 17

reduce:

5y = 10

y = 2

x = -2 - 7

x = -9

check:

-9 + 2 = -7

-7 = -7

-(-9) + 4(2) = 17

17 = 17

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An experiment consists of choosing objects without regards to order. Determine the size of the sample space when you choose the

sdas [7]

Answer:

$n= 75, 582$

$n= 2300$

$n = 253$

Step-by-step explanation:

Generally the size of the sample sample space is mathematically represented as

$n = \left N } \atop {}} \right. C_r$

Where N is the total number of objects available and r is the number of objects to be selected

So for a, where N = 19 and r = 8

$n = \left 19 } \atop {}} \right. C_8 = \frac{19 !}{(19 - 8 )! 8!}$

$= \frac{19 *18 *17 *16 *15 *14 *13 *12 *11! }{11 ! \ 8!}$

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For b Where N = 25 and r = 3

$n = \left 25 } \atop {}} \right. C_3 = \frac{25 !}{(19 - 3 )! 3!}$

$= \frac{25 *24 *23 *22 ! }{22 ! \ 3!}$

$n= 2300$

For c Where N = 23 and r = 2

$n = \left 23 } \atop {}} \right. C_2 = \frac{23 !}{(23 - 2 )! 2!}$

$= \frac{23 *22 *21! }{21 ! \ 3!}$

$n = 253$

4 0

3 years ago

9 batteries cost 13 dollars.It's ratios and Rates

8090 [49]

One battery costs $1.44.

The unit rate would be
$\frac{1.44}{1 battery}$

To get that answer, you would have to divide 13 ÷ 9.

I'm not sure if this is what you were looking for, but if it was, I hope I helped! :-)

4 0

3 years ago

Read 2 more answers

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yuradex [85]

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3 years ago

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Roman55 [17]

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Hope this helps!

5 0

3 years ago

Need help quick!! <br> WILL GIVE BRAINLIEST

Murljashka [212]

Answer:

3 and 4 x=25, y=29

Step-by-step explanation:

If you need a step by step explanation, I will edit this later.

5 0

3 years ago