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akhl

@akhl

Dazzler

Posted: 16 years ago

#131

Because of some html related problems with IF, I see various texts like &amp, gt, nbsp etc. Can you make questions somehow clear to read?

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akhl

@akhl

Dazzler

Posted: 16 years ago

#132

I think #5 is

x-4y= -2
5x-4=-11

To graph x-4y = -2, take point (-2,0) on x axis and (0, 0.5) on y axis. Join the points with a straight line.

To graph 5x-4 = -11:

5x = 4-11

5x = -7

x = -7/5

x = -1.4

So draw a vertical line at x = -1.4

If question asks you to find values of x, y then find coordinates of point where the lines cut each other.

Edited by akhl - 16 years ago

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akhl

@akhl

Dazzler

Posted: 16 years ago

#133

Ignore all

#4) -2x+y+3=0
6x-3y=2

Graph of -2x+y+3 = 0

Putting y=0, we get

-2x + 3 = 0

2x = 3

x = 3/2 = 1.5

Therefore x intercept is (1.5, 0)

Putting x=0, we get

y+3 = 0

y = -3

Therefore y intercept is (0, -3)

Join points (1.5, 0) and (0, -3). This is graph of -2x+y+3=0

Graph of 6x-3y=2

Put y=0:

6x=2

x = 2/6 = 1/3

x-intercept is (1/3, 0)

Put x = 0:

-3y = 2

y = -2/3

y-intercept is (0, -2/3)

Join (1/3, 0) and (0, -2/3) with a straight line. This is the graph of 6x-3y=2

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Samia

@adiroykapur

Voyager

Posted: 16 years ago

#134

Hey guys, please help me. I have to do this biology project on germination/plant growth. Okay so I have to come up with a topic myself and all the easy ones are taken.

People have topics like the effect of diff temp. of water on germination, the effect of different colors of light, the effect of diff types of water, the effect of acid rain, effect of hydrochrolic acid, etc. Basically, all the easy ones are taken, So can you guys pleasee come up with a topic I can do my germination experiment on? =[ It does not have to be complicated it can be simple.

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IlIlIl

@IlIlIl

Sparkler

+ 10

Posted: 15 years ago

#135

^^ cant u show the process of phototropism?momvement of plant towards sun light/?

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maryam

@aishu_fan

Voyager

Posted: 15 years ago

#136

i need to find two additional roots for this question:
7+ v 7,5 - v 6

i think i put it wrong on the msg

tahnks again for the help! ur a blessing!

Edited by aishu_fan - 15 years ago

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akhl

@akhl

Dazzler

Posted: 15 years ago

#137

The last question is not clear. May be some characters got missed.

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maryam

@aishu_fan

Voyager

Posted: 15 years ago

#138

find the values of the 30th and 90th percentiles of the data please:

18,9,7,5,11,7,17,20,19,2,17,12,5,1,13,12,11,15,16,20

find the range and the interquartile range of the data.round to the nearest tenth

259,125,158,168,187,334,198

please please and thanks u very much!god bless!

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akhl

@akhl

Dazzler

Posted: 15 years ago

#139

Originally posted by: aishu_fan

find the values of the 30th and 90th percentiles of the data please:

18,9,7,5,11,7,17,20,19,2,17,12,5,1,13,12,11,15,16,20[/quote]

Arrange the data in ascending order. We get

1, 2, 5, 5, 7, 7, 9,11,11,12, 12, 13, 15, 16, 17, 17, 18, 19, 20, 20

Number of vaariable values N = 20

Rank of 30th percentile 30* (N+1)/100 = 30 * (20 + 1)/100 = 6.3

6th value = 7

7th value = 9

By interpolation, the value at rank 6.3 = 7 + .3(9 - 7) = 7.6

Rank of 90th percentile 90* (N+1)/100 = 90 * (20 + 1)/100 = 18.9

18th value = 19

19th value = 20

By interpolation, the value at rank 18.9 = 19 + .9(20 - 19) = 19.9

Ans: 30th percentile = 7.6, 90th percentile = 19.9

[quote] find the range and the interquartile range of the data.round to the nearest tenth

259,125,158,168,187,334,198

please please and thanks u very much!god bless!

Arrange the numbers in ascending order. We get

125, 158, 168, 187, 198, 259, 334

Maximum value = 334, minimum value = 125

Range = maximum value - minimum value = 334 - 125 = 209

Median = middle value = 187

The numbers on the left of the median are 125, 158, 168

Q1 = middle value of the numbers on the left of the median = 158

The numbers on the right of the median are 198, 259, 334

Q3 = middle value of the numbers on the right of the median = 259

Interquartile range = Q3 - Q1 = 259 - 158 = 101

Ans: Range = 209, interquartile range = 101

Note: You can calculate Q1 and Q2 by as in the first problem by noting that Q1 = 25th percentile and Q3 = 75th percentile

_____________________________.

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Sonia

@Miggi

Inactive

Posted: 15 years ago

#140

Hello,

I am in university( first year) and I need help in Chemistry's lab.

okay we did a lab on determination of gas constant R.

and I need to report atlest 4 possible sources of systematic errors.

To give brief Intro " material used were Burette appratus which is used to measure the vol. of H2 gas, two samples of metal, HCl, erlenmeyer flask.

In this experiment we had to measure the vol of hydrogen gas when a known metal was reacted with excess HCl, strong acid. nd then we used experimental data to find gas constant R.

I hope i provided enufff info.

Plzz i need help ASAP.THnxx in advance.

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