# Posts by PsyDAG

Total # Posts: 23,417

**Biology**

Assuming that you mean a control group, to see if the independent variable makes a difference.

**Maths**

89/18 = 4.9444 .9444 * 18 = ?

**Math**

If dealing with discrete whole units, 25. If not, 24.5.

**Statistics**

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. Standard deviation = square root of variance I'll let you do the ...

**Algebra 1**

Here is what I get: x^2 - (x-3)^2 = x^2 - (x^2 - 6x + 9) = x^2 - x^2 + 6x - 9) = 6x - 9 Typos?

**algebra**

95 < 75 + .80m Solve for m.

**math college readiness**

No segment. Cannot copy and paste here.

**math**

Cannot draw here.

**math**

Any parentheses?

**math**

What are your choices?

**Working with Events**

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. P(w) = 10/44 * (10-1)/(44-1) = ? P(b) = 12/44 * (12-1)/(44-1) = ? Either-or probabilities are found by adding the individual ...

**Math**

Jess is right for the first part. Z = (score-mean)/SD Insert the values and compute.

**math**

Emily = 5u John = (1-8/13)u

**English**

Both 2 and 4 are incorrect.

**English**

No. http://writingexplained.org/was-vs-were-difference

**math (?)**

No scatterplot. Cannot copy and paste here.

**Plz check (partial)**

1. DK, but guess at D 2. Agree 3. Agree 4. agree 5. agree 6. agree 7. agree 8. agree DK the rest.

**bio**

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

**math**

80 = one time fee x = number of months 55 = fee per month

**math**

(w+11)/7 = ?

**Math**

The mean is a fulcrum (balance point) for the distribution. The median is the 50th percentile. a) disagree b) agree

**Math**

Arrange data better. 2 and under 17% 3-5 19% 6-9 24% 10-12 13% 13 and over 27% a) agree b) disagree c) agree d) agree

**Find the probability that a person has the virus**

What virus?

**Find the probability that a person has the virus**

48/5730 = ? 416/721 = ?

**Science**

72/6 = ?

**Biology**

You cannot copy and paste here.

**math, algebra**

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. This is much more than algebra.

**statistics**

What is the variable in the distribution?

**Algebra**

Agree

**Math**

Are you asking for the probability that the other two children are male? If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. Approx. 1/2 * 1/2 = 1/4 The probabilities are not ...

**Algebra**

It only costs $4.80 to produce an additional 4 units? That is $1.20 per additional unit. $204.80 + 10($1.20) = ? Typos?

**Math**

12x - 3x + 15y + 1 + 8x - 20y = 17x - 5y + 1

**English**

We took the available food without being served.

**English**

The subject pronouns include I, he, she, you, it, we, and they. The second type of pronoun is an object pronoun, which takes the place of a noun that receives the action. Objects in sentences usually occur in the predicate of the sentence. The object pronouns include me, you, ...

**Science**

It would help if you proofread your questions before you posted them. Do not know what color flowers the "plant" has, so I assume white. If so, I would guess B.

**math**

X - 3/8X - 2/5(1-3/8)X = $15 Solve for X.

**Math**

The median is essentially the 50th percentile. Think of the mean as a fulcrum or balance point. a) disagree b) disagree c) agree

**Sports**

Since this is not my area of expertise, I searched Google under the key words "law 'handling the ball' in the field of cricket" to get these possible sources: https://www.google.com/search?client=safari&rls=en&q=law+'handling+the+ball'+in+the+field+of...

**Chemistry needs help**

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

**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 your later post.

**Probability**

http://www.mathwords.com/c/combination_formula.htm

**Probability (?)**

Lack Data

**Math (Polynomials)**

Welcome

**Math (Ooops)**

Sorry, B. https://www.mathsisfun.com/definitions/coefficient.html

**Math (Polynomials)**

4x^2+3x-3

**Algebra**

What is your question?

**math**

Cannot post distributions here.

**statistics**

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. 12/24 * (12-1)/(24-1) = ?

**Anatomy and Physiology**

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. What are your best answers?

**Algebra, Solving inequalities**

1. Subtract 5h from both sides and add 16 to both sides. 2.Add 13 and subtract 4x from both sides. Looks like there is a typo somewhere. 3. Don't know. 6. Add 12 to both sides. 7. Divide both sides by 12. 8. When multiplying/dividing inequalities by a negative number, the ...

**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.

**Science**

lead

**Math**

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. A) (1-.12)(1-.29) = ? B) It is in your data, .07.

**statistics**

Z = (score-mean)/SD = (844-541)/101 = 303/101 = 3

**Math Probability Distribution**

It would help if you proofread your questions before you posted them. "lies between 57 - c and 57 - c" = 0 98% = mean ± Z (SD) Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the ...

**Math Probability Distribution**

It would help if you proofread your questions before you posted them. "lies between 57 - c and 57 - c" = 0 98% = mean ± Z (SD) Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the ...

**Science**

Consult text or Google it. I searched Google under the key words "blood flow through body and heart" to get these possible sources: https://www.google.com/search?client=safari&rls=en&q=blood+flow+through+body+and+heart&ie=UTF-8&oe=UTF-8 In the future, you can find ...

**Science (?)**

No following. Cannot copy and paste here. Mars is smaller, so gravity is less.

**math**

The common denominator would be 50.

**Algebra 2(help please!!)**

(a) It is direct. (b) Knowing they are being observed may change behavior. (c) Sample = 10 students Population = all high school students (d) I would say none, because the sample is too small and b.

**Math**

You need to post the specific questions.

**math**

My son's name.

**Math**

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 (.30) and its Z score. Insert data into above equation to solve for the score.

**Algebra**

Need some indication of twins' ages.

**Algebra**

It would help if you proofread your questions before you posted them. "$2.00"?

**Math**

The number ? is a mathematical constant, the ratio of a circle's circumference to its diameter, commonly approximated as 3.14159. It has been represented by the Greek letter "?" since the mid-18th century, though it is also sometimes spelled out as "pi"...

**math**

T = .9(30) = ? P = .78(90) = ?

**Science**

No illustration. You cannotcopy and paste here. They are all related to reproduction.

**math**

More data needed.

**Math**

(1-.6)x = 240 Solve for x.

**maths**

8.5(128*81 - 125*78) = ?

**Math**

.6/6 = ?

**Statistics**

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 between the two Z scores.

**math**

No table. Cannot copy and paste here.

**math**

agree

**Math**

Disagree, assuming each block is 1x1, that gives you 16 blocks. by the way, 1/4 ? 20%, 1/5 ? 25%

**Math**

.3 * 450 = ?

**Science**

80 * 4/5 = ?

**Math**

agree

**attitude**

As far as I know, "teapoi" is not one of the tutors. Even so, I apologize for any hateful post.

**Maths**

M = 3N (M+10) + (N+10) = 80 Substitute 3N for M in the second equation and solve for N. Insert that value into the first equation to solve for M. Check by putting both values into the second equation.

**math**

The answer is right in front of you. "Skittles 30%"

**Math**

He could have just 6 insects. Or he could have 3 spiders and 2 insects.

**algebra**

Pythagorean theorem for right triangle. a^2 + b^2 = c^2 3^2 + 4^2 = c^2 Solve for c.

**Maths**

How can it be 125 and 295. To sum to 99, each must be less than 99.

**math**

Possibilities out of 36 are 1,3 1,2 3,1 2,1 1,1 2,2 6/36 = ?

**Math**

.6(150) + .75(200) + 130 = ?

**Math**

.6(150) + .75(200) + 130 = ?

**Mathematics**

1/70 = x/2100 Solve for x.

**Math**

27.30/17 = x/30 Solve for x.

**MATH**

No following given. You cannot copy and paste here.

**biology**

Look up each term in your text or Google.

**math**

No table.

**Math**

(1-1/4)x + 10*20 = 300 Solve for x.

**Math**

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 between the two Z scores.

**Math**

Area = width * height 35 = 5 * ?

**Math**

98

**math (?)**

No Data

**math**

M = S + 20 M + S = 50 Substitute S+20 for M in the second equation and solve for M. Insert that value into the first equation to solve for S. Check by putting both values into the second equation.

**Math**

41 + 41/7 = Total cost Divide total cost by 2.