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2 years ago

I forgot how to do this graph thing with algebra so If you could please explain it to me that would be great :)

Mathematics

1 answer:

brilliants [131]2 years ago

4 0

Answer: D

Step-by-step explanation: It said the grandparents were less than 89 years old, if it said that the grandparents that were 89 and younger had remembered that's when you would use a solid circle because the 89 would be included. But since 89 isn't included then it's an open circle.

You might be interested in

3x + 2y + z = 8 2x - 3y + 2z = -16 x + 4y - z = 20

padilas [110]

I'll do a similar problem, and I challenge you to do this on your own using similar methods!

x+5y+2z=23
8x+4y+3z=12
9x-3y-7z=-10

Multiplying the first equation by -8 and adding it to the second one (to get rid of the x) and also multiplying the first equation by -9 and adding the third one to get rid of the x there too, we end up with

-36y-13z=-92
and
-48y-25z=-217

Multiplying both equations by -1, we get
36y+13z=-92
48y+25z=217

Multiplying the (new) first equation by -4/3 and adding it to the second (to get rid of the y), we get
(7+2/3)z=94+1/3

Dividing both sides by (7+2/3) to separate the z, we get
z= $\frac{282/3}{23/3} = \frac{282}{23}$

Plugging that into
48y+25z=217, we can subtract 25z from both sides and divide by 48 to get
$y= \frac{217-25z}{48} =\frac{217-25*282/23}{48}$

Lastly, we plug this into x+5y+2z=23 to get
x=23-5y-2z by subtracting 5y+2z from both sides to get
$x=23- \frac{217-25*282/23}{48}*5-2*282/23$

Good luck, and feel free to ask with any questions!

4 0

3 years ago

Please help me asap!!! ):

pogonyaev

9514 1404 393

Answer:

see attached

Step-by-step explanation:

It is helpful to understand that the product of the binomial factors is ...

(ax +b)(cx +d) = ac·x² +(ad+bc)x +bd

For these problems you only need to look at the constant and the leading coefficient to find the missing values.

1. d = 8/-4 = -2

2. b = -24/(3·2·d) = -4; c = 3/(3·a) = 1

3. a = 2/c = 1; d = -24/b = 6

3 0

4 years ago

mya sold ipods on her website.she bought the the ipods for $80 each and included a 45% markup to get the selling price.what was

Anna11 [10]

Answer:

$116.00

Step-by-step explanation:

80.00x45%=36.00

80.00+36.00=116.00

4 0

3 years ago

Is 2/7 greater than 4/21

maks197457 [2]

Yes. 2/7 would equals 6/21, and 6/21 is greater than 4/21.

5 0

4 years ago

Read 2 more answers

Consumption of fast food is a topic of interest to researchers in the field of nutrition. An article reported that 1880 of those

frez [133]

Answer:

the proportion is 0.2779, that is a 27.79%

Step-by-step explanation:

The article reported that 1880 children ate fast food from a sample of 6765 children. We can use the rule of three to find the proportion of children that ate fast food

from 6765 we have 1880 children that ate fast food
from 100 children we have $1880 * (\frac{100}{6765}) = 27.79$ children that ate fast food

that gives us that a 27.79% of the children ate fast food on a typical day. We can obtain the proportion by dividing the percentage by 100, that gives us a proportion of 27.79/100 = 0.2779.

I hope this helped you!

3 0

3 years ago