# Posts by PsyDAG

Total # Posts: 23,468

**Biology**

The sweat loses salt along with fluid, so the person should take water along with the salt tablet.

**math**

Median = 50th percentile, middle score in value Mean = ∑x/n = sum of scores/number of scores

**algebra 2b**

99% = mean ± Z SEm SEm = SD/√n

**math (?)**

How are "pints" awarded?

**math**

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.

**Stat**

X^2 = ∑ (O-E)^2/E, where O = observed frequency and E = expected frequency. ∑ = sum of all the cells. E = (column total * row total)/grand total df = n - 1, where n = number of cells Look up value in X^2 table in the back of your textbook.

**8th Grade Electives Advice**

Do you have any long term goals that might fit either one? Journalism will enhance your writing skills, and Creative Photography should enhance you artistic abilities. Which is more important to you?

**Biology**

Disagree. Google "protist movement."

**science**

You can use anything that is used for insulation.

**Statistics**

220/(220+370) = ?

**Math**

It would help if you proofread your questions before you posted them. How many? Assuming the brick is square, 12 inches = 1 foot, so brick is 1 foot square. 13 * 7 = ? sq ft

**English**

Learning indigenous languages allows for better communication and indicates empathy for those peoples and their traditions.

**English**

agree.

**matha literacy,business studies,Tourism,Accountin**

intense or irrational dislike or fear of people from other countries. You can Google for definitions.

**Maths**

March-November = 9 months 162/9 = ? ? * 5 = Allowance

**why dont u tell me**

What is the hardest subject for anyone is the one that is most difficult to understand. It will vary from person to person. What is your hardest subject?

**English**

What is the status of married women in a traditional African marriage? What may they do and may not do?

**Maths (?)**

Lacking data. Perimeter = 2 Length + 2 Width

**Math**

perimeter = 2 Length + 2 Width

**Math(?)**

Don't understand your a and b.

**math (?)**

It would help if you proofread your questions before you posted them. "7 and than 13"?

**Statistics Homework (?)**

What is your question?

**Math**

Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown. I agree with C, but how is that different from D?

**math (Please help me out)**

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 "...

**Math**

1) 350/(6 1/3) = ? 2) (1-4/9)500 = ?

**Statistics Homework**

As indicated previously, if something happened 6 out of 20 times would you call that common?

**Geometry**

Which numbers indicate the sides (lateral area)?

**math**

1. wrong 2. wrong 3. wrong 4. Wrong, see definition of coefficient 5. wrong 6. wrong 7. Wrong, When multiplying/dividing, exponents are added/subtracted respectively. 8. Wrong Go back to your text book and read your lessons.

**Math**

Welcome

**Math**

All numbers are either odd or even.

**Safety & Emergencies**

Agree

**Life orientation**

What will you choose?

**science 4th grade**

inertia

**Math probibility**

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. 11/23 * (11-1)/(23-1) = ?

**math (?)**

What is your question?

**Math**

Week = 7 days Month = approximately 30 days.

**Math**

No

**psychology**

Do not explain study to physicians and nurses. Have a third party, who does not know the hypothesis, record interactions.

**math**

16 = 4S S = 4 16+x = 2(4+x) Solve for x.

**Math (?)**

What Chart? Cannot copy and paste here.

**chemistry needs help**

Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question.

**Math**

10^3 for digits (26-5)for first letter 26 for second letter If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

**science**

You're right that you're right.

**science**

Google the term.

**math**

Didn't you indicate the percentage increased by 60%?

**math**

950%

**Math algebra**

4x^2(2x+x^3y)+x^y = 8x^3 + (4x^5)y + x^y When multiplying/dividing, exponents are added/subtracted respectively. Anything to the zero power = 1 4x^5 * zero = zero So you are left with 8x^3 +1 = ?

**Math**

21 * .8125 = 17.0625 Right

**math**

1 59/100 or 159/100

**math**

1 3/10 or 13/10

**Spanish**

First two are right, but I cannot comment on the last two.

**Pre- Algebra**

Yes.

**Pre- Algebra**

Disagree with Gucci's answer. .3 * 60 = ?

**Life science,,maths lit,economic,business study**

Consult your school counselor, who can assess your abilities and interest to suggest possible careers for you.

**Maths lit, life science,business study,economic**

Consult your school counselor, who can assess your abilities and interests to suggest possible careers for you.

**Maths (?)**

How is this math? What is your context?

**Riddle**

We might be able to solve it, if it was in English.

**stats**

I don't know how you did it in class. Z = (score-mean)/SEm SEm = SD/√n Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability for the Z score. How does it compare to your ...

**Science**

With multiple choice, treat each alternative as a T-F question. If you don't know right answer, before guessing, eliminate wrong alternatives. This increases the chances of your guess being correct. Chemical change.

**health**

Although all are true, I would pick tissues.

**math**

What is YOUR reasoning?

**MATH**

12 * 12 = 144 inches on each side. 144/9 = 16 (16*3)+2 = ?

**Spanish**

Right, but it requires a following verb.

**Math**

D = 3S (42+10) + S+10 + D+10 = 100 Substitute 3S for D in the second equation and solve for S. Insert that value into the first equation to solve for D. Check by putting both values into the second equation.

**Math**

I don't know about "free calculators" mean, but all you need to do is insert various values for x and calculate the y value that matches. e.g., y = 8-8 = 0

**Statistics Range, Variance, and Standard Deviation**

Range = highest value - lowest Find the mean = 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. Standard deviation = square root of variance ...

**Statistics Homework**

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 "...

**Statistics**

From the sample, with only 6 of 20 earning the degree in 4 years, it does not seem "common."

**science**

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you. See previous post.

**Alegebra**

When multiplying/dividing, exponents are added/subtracted respectively. 5^12 5x^2 + 6x - 2

**science**

The force was not great enough?

**science**

It would help if you proofread your questions before you posted them. How much did it increase per year? Remember, there are 3 years of interest.

**math**

10z - 4 + 8z - 8 = 18z - 12

**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.

**Science**

What are your choices? GPS?

**math (?)**

What items? You cannot copy and paste here.

**Math**

-3 - 2 + 9 = ?

**Math (?)**

What size tiles?

**ICT(?)**

Lacking data.

**ICT (?)**

Lacking data.

**life orientation (?)**

What is your question?

**DPS**

10m + .1m(5*12) = ?

**Science**

Advice to the exam-lorn ("test wiseness") I. Answer easy items first. If have to think about any question after reading for more than a minute, move on. A. Can get Qs you are sure of correct within the time limit. Spending too much time on hard questions, might keep ...

**Math Help please!**

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. 5/14 * 2/(14-1) = ?

**math**

Question unclear. First draw 20/70 = ? Two draws, both green with replacement: If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. 20/70 * 20/70 = ?

**Math (?)**

No designs shown. Cannot copy and paste here.

**Math statistics**

Approximately 50% if males are also included in the 25-35 group.

**math**

16 * 4 = ?

**math**

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. 1/6 * 2/8 = ?

**Pre-Algebra**

4y + 4 + 3y - 18 + 14 = 28 Combine like terms and solve for y.

**Statistics**

SEm = SD/√n

**Math**

Need parentheses. (9-3)/(1/3+1)? 9 - (3/[1/3]) + 1? 9 - 3/(1/3+1)?

**Math**

8t + 12 = 8t + 12 (identity) -3m - 7 = -3m + 7 (Typo?) yes, t = 15

**math (really?)**

Start with ball, gall, mall, glub, glum, lamb, mull.... Can you think of others?

**life sciences (?)**

No graph or question.

**Science ?**

What data do you want to collect?

**statistics**

9 * 10^4

**Statistics Algebra 2**

How does a differ from c? If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. b) (3/4)^20 c) "at least 6" translates to either 6, 7, 8, 9 or 10. Either-or probabilities ...

**Maths**

(1-2/3)x = 19 Solve for x.

**Math**

3/5q-(1/5+2q) = .6q-.2-2q = -.2-1.4q