Tuesday

October 6, 2015
Total # Posts: 85,577

**Chemistry**

1) Which group of elements is the least reactive? Explain why. 2) What properties distinguish metalloids from other elements? 3)Explain how to predict the charge usually observed for a monatomic ion.
*July 2, 2015*

**Chemistry**

How many GRAMS of boron are present in 3.54 moles of boron trifluoride
*July 2, 2015*

**Math**

The distance between two cities on a map is 4 inches. The actual distance between the two cities is 24 miles. What is the scale used on the map? If the scale on a different map of the same area is inch = 1 mile, how many inches separate the same two cities?
*July 2, 2015*

**Calculus Minimum**

Problem: Find minimum?maximum for: y=xa^(1/x) Ans given: X=ln(a) (min) Can't get to it.
*July 2, 2015*

**Algebra**

2*P + 3C=57 P+2C=33 double the second equation, then subtract it frm the first. 2P+3C=57 2P+4C=66 -c=-9 cost for child is 9 dollars. Now put that into the first equationo, and solve for A cost
*July 2, 2015*

**Algebra**

Calvin deposits $400 in a savings account that accrues 5% interest compounded monthly. After c years, Calvin has $658.80. Makayla deposits $300 in a different savings account that accrues 6% interest compounded quarterly. After m years, Makayla has $613.04. What is the ...
*July 2, 2015*

**mathematics**

A kilogram of rice costs $6. What is the cost of 400g of the rice.
*July 2, 2015*

**Math**

The adjacent sides of parallelogram are 26cm and 28cm and one of its diagonal is 30cm. Find the area of the parallelogram by using heron's formula
*July 2, 2015*

**Chemistry**

I know Chadwick found/discovered the neutron, but my textbook does not state what experiment he did to find it. Can someone briefly state what he did to find the atom?
*July 1, 2015*

**Chemistry/reading**

Oh I see now, thanks!
*July 1, 2015*

**Chemistry/reading**

Although Rutherford's model was highly successful, scientists realized that it was incomplete. For example, hydrogen atoms contain one proton, and helium atoms contain 2, yet a hydrogen atom has only 1/4 the mass of a helium atom. I'm not comprehending what my textbook...
*July 1, 2015*

**Chemistry**

Would this be suffice: Prior to 1930, radioactivity was discovered with three different types: alpha, beta, and gamma particles. With alpha particles, Rutherford and Chadwick were able to discover two parts of the atom: the nucleus and neutron, respectively. Rutherford did the...
*July 1, 2015*

**Chemistry**

Describe 3 experiments, run prior to 1930, and the types of energies/particles used to probe the structure of the atom. What did each experiment investigate? Include the names of the scientists associated with each experiment in your answer.
*July 1, 2015*

**Math**

A bag contains 3 red marbles, 4 blue marbles, and 5 white marbles. What is the probability of pulling out two red marbles in a row if none are replaced? A. 1/22 B. 1/16 C. 1/24 D. 1/5
*July 1, 2015*

**Calculus Derivative**

Find derivative: y= e^(x^x)
*July 1, 2015*

**calc**

y'=8x/y separation of variables... y dy = 8x dx 1/2 y^2 + C=8/2x^2 + K looks to me the general solution is y^2=8 x^2 + K check: 2ydy=16x dx dy/dx=8x/y
*July 1, 2015*

**calc**

Which of the following is the general solution of the differential equation dy dx equals the quotient of 8 times x and y?
*July 1, 2015*

**chemistry**

A sample of ammonium phosphate(NH4)3PO4 contains 3.18 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is (1)0.265 (2)0.795 (3)1.06 (4)4.00
*July 1, 2015*

**mechanic **

a can of oil 8 inches high and 8 inches in diameter .what is the approximate volume of the can?
*July 1, 2015*

**Math**

57865- +23129=48675
*June 30, 2015*

**Math**

Thank you.
*June 30, 2015*

**Math**

Margo and Carrie are trying to go to Idaho for Dawn's wedding. The probability of finding a flight for less than $400 is 1/7. The probability of Carrie making enough money babysitting to pay for her flight is 3/5. The probability of the girls being able to take time off ...
*June 30, 2015*

**Chemistry**

Thanks for the help!
*June 30, 2015*

**Chemistry**

My drawing should include a negative and positive charged plate with atoms being suspended inside with some flowing towards the negative plate and others flowing to the charge plate. Would this be suffice?
*June 30, 2015*

**Chemistry**

Draw a diagram to illustrate your explanation of how the charge of a single electron was determined. I'm suppose to draw a picture to show how they determined electrons were negative, but am unsure of what to draw for it. One of my ideas is to draw a cathode ray tube with ...
*June 30, 2015*

**Chemistry**

I probably could write a one or two page summary, but I have to condense al lot that to about 3 sentences, so rephrasing my question I guess, in the shortest way possible, how does a cathode ray tube work?
*June 30, 2015*

**Chemistry**

How does a cathode ray tube work? What I want to write: Energy is given to the cathode , thus allowing an energy beam to be crated between the positive charge on one end of the tube, and the negative charge on the other end. Can I add anymore? Also, would it be reasonable to ...
*June 30, 2015*

**finance**

100million X weighted index 1.12 = 112 million.
*June 30, 2015*

**finance**

Your program is planning to award a contract in January 2015 to purchase 100 missiles at an estimated total cost of $100 million (constant FY 2012 dollars). Currently, for Base Year 2012 in the Missile Procurement Appropriation, the FY 2015 raw index is 1.06 and the FY 2015 ...
*June 30, 2015*

**statistics**

what is the equation to figure a slope of a line?
*June 30, 2015*

**statistics**

Jesse took two data points from the weight and feed cost data set and calculated a slope, or average rate of change. A rat weighs 3.5 pounds and costs $4.50 per week to feed, while a Beagle weighs 30 pounds and costs $9.20 per week to feed. Using weight as the explanatory ...
*June 30, 2015*

**algebra**

if the perimeter of a rectangular closet is 40 ft and the width is 1 ft less than half of the length, what are the length and width ?
*June 30, 2015*

**experiment physics**

buat lab manual la tu.. cari la jwpn sendiri
*June 30, 2015*

**experiment physics**

usaha la sendiri..
*June 30, 2015*

**BUS 303**

Which of the following is NOT true about the current demographic trends in the workforce
*June 30, 2015*

**Chemistry Subatomic particles**

What data led to the need for change in Daltons ideas?
*June 29, 2015*

**Chemistry Subatomic particles**

What data led to the need for change in Daltons ideas?
*June 29, 2015*

**Math**

Andrea has 6 blue shirts, 2 red shirts, and 5 green shirts in her closet. What is the probability that she will randomly pick out a red shirt on Monday and a green shirt on Tuesday after putting the red shirt in the laundry? A. 7/25 B. 5/78 C. 7/156 D. 2/5
*June 29, 2015*

**Mah**

Adam has 4 dimes, 4 quarters and 4 nickels in his pocket. He pulls out 2 coins making sure to put the first one back in his pocket before picking the second. What are the odds that he pulls out 2 nickels? A. 1/3 B. 1/9 C. 1/16 D. 1/81
*June 29, 2015*

**calc**

The slope of the tangent line to a curve at any point (x, y) on the curve is x divided by y. What is the equation of the curve if (3, 1) is a point on the curve?
*June 29, 2015*

**Organic Chemistry**

Please help! Thank you! Alcohols can act either as weak acids or as weak bases, just as water can. Show the reaction of methyl alcohol, CH3OH, with a strong base such as Na+ -NH2
*June 29, 2015*

**Ethics & Social Responsibilities **

What is the difference between RU486 and “Plan B”? (Points : 1) RU486 cannot prevent pregnancies that have already occurred while “Plan B” can. RU486 prevents eggs from fertilizing while “Plan B” works to destroy the embryo. RU486 and “Plan B...
*June 29, 2015*

**Ethics & Social Responsibilities **

What is the difference between physician-assisted suicide (PAS) and euthanasia? (Points : 1) During PAS, patients end their own lives; during euthanasia, the doctor ends patients’ lives. During PAS, the doctor ends the patients’ lives; during euthanasia, patients end...
*June 29, 2015*

**math**

f(t) = \int_0^t \frac{x^2+11 x+24}{ 1+\cos^2(x)} dx At what value of t does the local max of f(t) occur? t = ?
*June 29, 2015*

**Chemistry**

So if I were to draw the cross section would I just draw it as so- Lead Copper ooooooo ooooooo ooooooo ooooooo ooooooo ooooooo ooooooo ooooooo
*June 29, 2015*

**Chemistry**

Then if I sketch a diagram of a cross section of the atoms of both elements, it would look the same. If they look the same then in my explanation should I say, since both diagrams are the same, the only reason that lead is denser than copper is due to the fact that lead has a ...
*June 29, 2015*

**Chemistry**

Copper and lead had different densities. Sketch a diagram at the particular nature of matter level showing the atoms of a small cross section of copper and lead. Use this diagram to explain why lead is denser than copper. I couldn't find any pictures or see anywhere in my ...
*June 29, 2015*

**matlab**

how do you write a code that prompts the user for data points that are then put into an array
*June 29, 2015*

**Math**

What is the order for 2/5, 9/10, 1/3, .50, .05 from least to greatest?
*June 29, 2015*

**math**

The income of a and b are retio 3:2and their expenditure are in the ratio 5:3 if each saves rs 2000 what is their income
*June 29, 2015*

**business statistics**

using empirical formula a company is studying the number of daily debit card purchases. THere were 20 purchases and the probability of a debit card purchase is 0.5. what is the stadnard deviation of the number of debit card purchases
*June 29, 2015*

**calc**

Find the area of the region bounded by the curves y equals the inverse sine of x divided by 4, y = 0, and x = 4 obtained by integrating with respect to y. Your work must include the definite integral and the antiderivative.
*June 29, 2015*

**math**

find volume when the region bounded by the curves y = Ln(x), y = 2, and x = 1 is revolved around the line y = −2.
*June 29, 2015*

**calc**

An object has a constant acceleration of 30 ft/sec2, an initial velocity of −10 ft/sec, and an initial position of 4 ft. Find the position function, s(t), describing the motion of the object.
*June 29, 2015*

**Math**

Unlikely
*June 28, 2015*

**Math**

Eugene lives in the desert in Arizona. What is the likelihood he will need an umbrella today? A. certain B. likely C. unlikely D. impossible
*June 28, 2015*

**Math**

Thank you.
*June 28, 2015*

**Math**

Ahmed buys two dozen eggs. As he is cooking one day he discovers that three of the two dozen eggs have double yolks! Based on this experiment, what is the experimental probability of selecting a double yolk egg from a pack of eggs? A.10% B. 12% C. 12.5% D. 25 % I think is 25% ...
*June 28, 2015*

**Math**

Thank you. I do not like this kind of questions because they are subjective. They confuse me.
*June 28, 2015*

**Math**

It is raining outside when the temperature quickly drops below freezing and stays that way for several hours. What is the likelihood that the water on the ground will turn to ice. A. Certain B. Likely C. Unlikely D. Impossible
*June 28, 2015*

**Math**

Thank you.
*June 28, 2015*

**Math**

Alice has a basket containing 6 red socks, 4 blue socks, and 12 white socks. Find the theoretical probability that Alice will randomly select a red sock from the basket. I think I have to add the number of socks to know the total and then divide 6/22. Please is this right.
*June 28, 2015*

**Math**

Thank you. I thought the same which in simple form is 4/5
*June 28, 2015*

**Math**

Christopher has scored at least 1 goal in 12 of his 15 soccer games this season. What is the experimental probability that he will score in the next game?
*June 28, 2015*

**Calculus Partial Fraction**

Sorry. The problem should have been: (x^2)/(x^3-8)(x-2)
*June 28, 2015*

**chemistry**

In the reaction of sodium metal with chlorine gas to form sodium chloride, how does chlorine form an anion? Write an equation to support your answer. I know that chlorine becomes an anion since it's gaining an electron from sodium, but how do I show that in an equation?
*June 28, 2015*

**Math**

p. 84 no.10 (from Solid Mensuration: Understanding the 3D Space book by Earnhart) Plane A which contains an isoceles right triangle forms a dihedral angle of 60 degrees with another plane B. If the hypotenuse of the triangle lies in plane B and measures 8 inches, find the ...
*June 28, 2015*

**Calculus Partial Fraction**

(x^2)/(x^3)(x-2)
*June 28, 2015*

**chemistry**

correct the following examples of gasses to standard temperature. (assume pressure is constant)(STP stands for standard temp and pressure which is 273K and 101kPa, you do no have to think about the pressure for these four but on the last three you will have to so T2 is 273K ...
*June 28, 2015*

**algebra**

Identify the variables, the variables, constant numerical and literal coeficient? 25x(fourth)+3x
*June 28, 2015*

**Variable expressions**

The perimeter of an equilateral triangle is 6n - 15. Write an expression to represent the length of each side.
*June 28, 2015*

**Math **

what is log3(81)?
*June 27, 2015*

**Math**

sorry, I'll post the entire question next time.
*June 27, 2015*

**Math**

I got this from the textbook. Write each expression as a single logarithm. Assume that all the variables represent positive numbers. 1+log3(x^2). The answer in the back is log3(3x^2).
*June 27, 2015*

**Math **

I need help for this question. I also need an explanation.The answer says log3(3x^2) but I need an explanation. 1 + log3(x^2) Math - Steve, Saturday, June 27, 2015 at 6:51pm I'm not Carnak the Magnificent. What was the question, and how did you arrive at your answer? We&#...
*June 27, 2015*

**english/research writing**

menas ddoing something at the agreed or proper time ..........
*June 27, 2015*

**Math**

it is D
*June 27, 2015*

**Math**

Which of the following points are NOT on the graph of y = x^2 - 1? A. (0, -1) B. (1, 0) C. (-1, 0) D. (0, 0)
*June 27, 2015*

**Math**

I didn't get the answer. I looked at the back of the textbook for the answer.The answer from the back of the textbook was log3(3x^2). I just need to know how to get the answer.
*June 27, 2015*

**Math**

1 + log3(x^2) is the question. I posted it up there.
*June 27, 2015*

**Math **

I need help for this question. I also need an explanation.The answer says log3(3x^2) but I need an explanation. 1 + log3(x^2)
*June 27, 2015*

**calc**

For an object whose velocity in ft/sec is given by v(t) = −3t2 + 6, what is its distance travelled, in feet, on the interval t = 0 to t = 2 secs?
*June 27, 2015*

**calc**

The region in the first quadrant bounded by the x-axis, the line x = π, and the curve y = sin(sin(x)) is rotated about the x-axis. What is the volume of the generated solid?
*June 27, 2015*

**calc**

he base of a solid in the xy-plane is the circle x^2 + y^2 = 16. Cross sections of the solid perpendicular to the y-axis are semicircles. What is the volume, in cubic units, of the solid?
*June 27, 2015*

**Math**

If x = 8 which of the following is correct? A. -x + 11 ≤ -3 B. 5 × 2x > 82 C. x ÷ -2 = 4 D. 3x + 6 ≤ 32
*June 26, 2015*

**Math**

x>20
*June 26, 2015*

**Math**

Write an inequality for the following statement: Caroline has more than 20 pairs of shoes in her closet. A. x=20 B. x>20 C. x≥20 D. x<20
*June 26, 2015*

**Pre Calculus**

Let θ be an angle in quadrant IV such that cosθ = 4/9. Find the exact values of csc θ and cot θ. I am just completely lost! Thanks!
*June 26, 2015*

**Math**

Which equation represents the solution to the following? I have some lemons. Jill has two more limes than five times the number of lemons that I have. Emma has one-third as many limes as Jill. Emma has 4 limes. How many lemons do I have?
*June 26, 2015*

**aero**

what are in flight vectors?
*June 26, 2015*

**Grammar**

Which is correct? And why? She should not do this nor that. Or She should not do this or that. Or vs Nor..
*June 26, 2015*

**Math**

Ms. Sue did I do something wrong; please let me know about the answers I provided to you. Thank you.
*June 26, 2015*

**Math**

I know so I do not know because according to my answers none of them is right. I probably did something wrong.
*June 26, 2015*

**Math**

A. 3≤-3 B. 80>82 C. -4=4 D. 30≤32 I think the right one is D
*June 26, 2015*

**Math**

If x = 8 which of the following is correct? A. -x + 11 ≤ -3 B. 5 × 2x > 82 C. x ÷ -2 = 4 D. 3x + 6 ≤ 32
*June 26, 2015*

**Math**

Write an inequality for the following statement: Karl sent Kim at least 5 letters while he was away on vacation. A. k=5 B. k>5 C. k≥5 D. k≤5
*June 26, 2015*

**Math**

Solve for c. 3c/4 - 1 > 1
*June 26, 2015*

**math**

find a ratio equal than the ratio given 12:7
*June 25, 2015*

**maths**

find series solution of the differential equation y"+3x^2y'-xy=0
*June 25, 2015*

**mathematics**

What is the product of 324 and 46?
*June 25, 2015*