# Posts by PsyDAG

Total # Posts: 23,458

Algebra 1
5 gallons = 220 miles Let x = additional miles traveled 220/5 = x/10 I'll leave the explanations up to you.

English

science
If you had diploid cells instead of haploid cells forming the zygote, each generation would have double the number of chromosomes.

maths
Let x = second son's share. .65x + x + 1.35x = 3873 Solve for x.

Stats
P(A) is right. P(C) = 2/38 = .053 Only two choices are green. Why did you add 18 twice?

maths (?)
Cannot see which face is shaded.

Maths
5 students scored more than 70. 40% of 50 (20) students scored below 55. That leaves (50-25) students scoring between 55-70. What percentage is that?

statistics check my work..thank you
Same here.

statistics check my work
Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance. Didn't check the math, but if this is what you did, this and the rest is on point.

math
To get total of 21, the next card must be a 4. (4-1)/49 = ? Sorry, if there are no Aces, (4-1)/45. Without an ace, the player can draw a 5(4 chances), 6 (4 chances)... K,Q or Jack (11 chances). Fill in the remaining chances and divide that sum by 49 (or if the case may be, 45.

math
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. 13/52 * (13-1)/52-1) = ?

math
6^3 = 6 * 6 * 6

Math
(7*13) - 87 = ?

Math
4x + x = 60 4x = ?

Math
Since the percentages add to 90%, the 90 students are in the remaining 10%, meaning that there were a total of 900 students. .4 * 900 = ? Cannot draw diagrams here.

math
Find the mean first = sum of scores/number of scores 55*1 + 65*309 + 75*1433.... Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance. Standard deviation = square root of ...

math
We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.

Stats in need of help
35/650 = ?

stat
Do not have table A-2. Lack data.

Help me with math
Find the mean first = sum of scores/number of scores Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Stats need help
Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability between the two Z scores. Multiply by 100.

Stats Help Help
Find the mean first = sum of scores/number of scores Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

STATISTICS
What do you consider are "the four levels of measurement"?

Stats
Disagree with second and third answers.

math
Z = (mean1 - mean2)/standard error (SE) of difference between means = 246/standard error (SE) of difference between means SEdiff = ?(SEmean1^2 + SEmean2^2) SEm = SD/?n If only one SD is provided, you can use just that to determine SEdiff. Find table in the back of your ...

bio
We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.

math
Let x = original sum This is assuming that the 1/5 was of the original sum rather than after the 1/4 was spent. x - .25x - .2x - 78 = 21 Solve for x.

math
Look in the back of your statistics textbook for a table called something like “area under normal distribution” to find the proportion/probability of Z = ±3. Or you can use this: http://davidmlane.com/hyperstat/z_table.html

Math
Assuming I interpreted your equation correctly: 5(2n+3) - (n+8) = 13 Combine terms. 10n + 15 - n - 8 = 13 9n = 6 Take it from there.

math
Is 26.7 seconds less than 30?

math
40m/1.5sec = 26.7 sec 30m/1sec = 30 sec

Mah
Online "^" is used to indicate an exponent, e.g., x^2 = x squared. Area = ? r^2 = 3.14 * 8 * 8 You do the math.

College Math
Cannot draw on these posts.

Math
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

Science
Agree

algebra
9230 = x/2 + 30 Subtract 30 from both sides, then multiply both sides by 2.

MATHS
First, please do not use all capitals. Online it is like SHOUTING. Not only is it rude, but it is harder to understand. Thank you. Second, we cannot diagram on these posts.

Maths
It would help if you proofread your questions before you posted them. Although you don't indicate your units, I assume that the ratio is 1 cm/500,000 Km. 500,000/1 = x/7 Solve for x. If the 500,000 is actually in cm, divide x by 10,000. (1000 m in a Km and 10 cm in a m.)

maths
(5/8)*(8/5) = 40/40 = 1 1 to any power = 1

statistic
What "two variables"? I only see the memory test. Z = (score-mean)/SEm SEm = SD/?n Look in the back of your statistics textbook for a table called something like “area under normal distribution” to find the proportion/probability related to the Z score.

Science (Biology)(?)
Although this is not my area of expertise, I would assume that anything "linked" cannot be separated.

Science
With half the mass, he would weigh half as much as on earth.

English
1 and 3 are advisable to do. 2 and 4 are your preference.

English
#3

STATISTICS
90% = mean ± Z (SEm) Look in the back of your statistics textbook for a table called something like “area under normal distribution” to find the proportion/probability (± .05) and its Z score. 90% = mean ± 1.645 SEm .5 = 1.645 SEm SEm = SD/?...

Math
4215

Math
Rain = (1-.3)^3 Claudia = 1/9 = .11 Ally = 2/17 = .12 I'll let you explain.

Math
If they are in groups of 4: 700 * n/4 = ? However, that is only in groups of 4. If there are 1, 2 or 3 extra, there still would be an extra charge of 700 pesos, any fraction would be another 700 pesos.

Math
let x = total number of students (1-4/9)x = 755 x = 1359 1359 - 755 = ?

algebra
.8C + .2G = 1 Punch

algebra
Rate * Time = Work done

math
S = 2G S-10 = 3(G-10) Substitute 2G for S in the second equation and solve for G. Insert that value into the first equation to solve for S. Check by putting both values into the second equation.

Math (?)
What were the other choices?

Math
It would help if you proofread your questions before you posted them. Is the length of the pole 11.2 meters or 11 halves (11/2) of a meter? 1 - 1/3 - 1/4 = 1 - 4/12 - 3/12 = 5/12 So the blue portion is 5/12 of whatever the length of the pole is.

math
"not selecting a consonant" = selecting a vowel. There are 3 vowels in the 8 letters. Take it from here.

Algebra (?)
Lacking data.

Algebra (?)
Unfamiliar with your notation \$\$\$\$\$

Science
Since this is not my area of expertise, I searched Google under the key words "silent mutation" to get th1s possible source: https://en.wikipedia.org/wiki/Silent_mutation In the future, you can find the information you desire more quickly, if you use appropriate key ...

Math (?)
What shaded area? You cannot copy and paste here.

English - Writing
Previous sentence needs a comma. In order to better assist you, select the best retirement benefit package to fit your personal needs. Select the best retirement benefit package to fit your personal needs.

family
The father of your half brother can be your father, if you have different mothers. If you both have the same mother, then he is your step father.

science
Density = mass + volume Volume = 2^3 Take it from here.

math (?)
No following statements. Also it would be easier to respond to if the data were shown as 9,12,8,7....

statistics
The probability of the heart in your example would be 13/50 if the king or ace did not include a heart. You have still not included probability that either/both a king or ace will be a heart. Thus the probability of the heart in your next equations would be either 12/50 or 11/...

Science
An independent variable is the potential stimulus or cause, usually directly manipulated by the experimenter, so it could also be called a manipulative variable. A dependent variable is the response or measure of results. Extraneous variables — other than the independent ...

Math
3t = 5c

Math
The field is 30 by 10. Figure it from there.

science
From Google: Eukaryotic organisms, such as algae, fungi, and higher plants, have multilayered cell walls composed in large part of either cellulose or chitin . Cellulose and chitin are polysaccharides , meaning they are composed of many linked sugar molecules.

science
agree

Math
You figured the area. The athlete runs the perimeter = 50 * 4 = 200 Kilometer = 1000 meters. (3*1000)/200 = ?

STATISTICS
.95 = mean ± Z(SD) = 1050 ± 290Z Look in the back of your statistics textbook for a table called something like “area under normal distribution” to find the proportion/probability (±.025) and its Z score. Insert the Z score into the equation ...

math (?)
By what process?

Statistics
Have you considered the fact the the king and/or the 10 could be a heart? Consider those probabilities. Either-or probabilities are found by adding the individual probabilities.

Math
A is right.

Math
Disagree. Watch out for "always" and "never" answers.

math
2/3 * 3/4 = ?

Math
Cannot diagram here. Distance A-C, use Pythagorean theorem. https://en.wikipedia.org/wiki/Pythagorean_theorem Total distance = 9 + 12 = ?

Health (Ms. Sue Check Please)
Not knowing WHY the doctor is worried about Kori's cardiovascular health, I would tend to agree.

Biology
Since this is not my area of expertise, I searched Google under the key words "process of digestion steps" to get these possible sources: https://www.google.com/search?client=safari&rls=en&q=process+of+digestion+steps&ie=UTF-8&oe=UTF-8 In the future, you can find the...

life sciences (?)
Lack data. No leaves.

English
1. 3 * 300ml = 3 * .3 liters = .9 liters 2 and 3 are even less, but 2 = .005 liters, 3 = .015 liters 4. is a possibility, but that is too much water. It would be better to express all in liters, but you would want them to drink more than .0015 liters a day.

English
All are okay, but 2 is better than 1. 3. would be like using weights that are too heavy. 4 would probably relate to frequency or duration of exercise. 5 would relate to frequency. 6. would relate to duration.

Maths (?)
No data. Cannot draw a flow chart here.

Math
However, I will give you a start. Convert all to cubic yards. Even so, there are several problems in making a comparison. Here are some examples: Knowing the size of the yard = (80/3)^2 sq yards is not really helpful, because you don't know the depth of the soil that will ...

Math
We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.

Biology-Genes
Use a Punnett square. https://en.wikipedia.org/wiki/Punnett_square Red fish are all rr. Green fish are either GG or Gr.

Math (?)
No tables shown. Cannot copy and paste here.

mathematics
Cannot draw on these posts.

algebra
Z = (mean1 - mean2)/standard error (SE) of difference between means SEdiff = ?(SEmean1^2 + SEmean2^2) SEm = SD/?n If only one SD is provided, you can use just that to determine SEdiff. Find table in the back of your statistics text labeled something like "areas under ...

Mathematics Algebra
value ? (b^2-a^2)

Math
Welcome

Math
you got it!

Math
1) 8/500 = x/20,000 2) 15/50 = x/2000

MMATH08
First, please do not use all capitals. Online it is like SHOUTING. Not only is it rude, but it is harder to understand. Thank you. Second, it would help if you proofread your questions before you posted them. If you are using only "10 aquare" tiles of gigantic size: ...

Algebra
5) Multiply first equation by 5. 5x - 20y = 60 6) Multiply first equation by 4. 4y - 24x = -12 Subtracting first equation from the second, what does that tell you?

Science (?)
Lack data.

Science
agree

Algebra
x/3x = 1/3x = 1/3(100) = .333

Science
It has to pump blood into the whole body.

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