# Posts by Lulu

Total # Posts: 355

**Algebra 2**

Solve by elimination -2x+2y+3z=0 -2x-y+z=-3 2x+3y+3z=5 Please help. I have 5 pages and 3 hours spent and found the question on Google, but the calculations did not add up correctly. Thank you

*March 8, 2017*

**math**

If A= X^2+2x+1, B=x=1 Find: A+B=

*February 18, 2017*

**math**

simplify (x/50)+(x/25)+(3x/50)+(2x/25)+...+2x= ?

*February 16, 2017*

**math**

(x/50)+(x/25)+(3x/50)+(2x/25)+...+2x=

*February 16, 2017*

**Social Studies**

DUH BAKA is right I got a them all thank you also I like your name on this... very Tsundere

*February 8, 2017*

**algebra 2**

Absolute value 9 [9 - 8x] = 2× + 3 9 [9 -6×] =3 9 [-6x] = -6 54x = -6 x= -1/9 , × = 1/9 Is this correct? If not could you explain please. Thank you

*February 6, 2017*

**algebra 2**

These are absolute value questions. [-4b -8] + [-1b -b^2] + 2b^3. b=-2 given [8] + [2 (4)] +-8 Answer =8 Is this correct?

*February 6, 2017*

**chemistry**

2Na + 2H2O---> 2NaOH + H2 Need to find the molecules of H2 Atomic wt o Na = 23 48.7 g of Na 48.71/23 = 2.12 mols Na 2.12/2 × 24. (WHERE DOES THE 24 COME FROM) = 25.44 dm^3 H. (PLEASE EXPLAIN THIS PART) = 1.06moles 1.06mols× 6.02×10^23 avagados number= 1....

*January 7, 2017*

**algebra**

P +4- 2 (p-10)> 0 Please check, it was marked wrong P+4 -2p +20 > 0 -p+ 24> 0 -p >-24 P > 24 Answer choices are 29, 26, 24, 22 Please explain thank you

*January 4, 2017*

**Math**

What does 5 yards 2 feet 3 inches plus 2 yards 2 feet 9 inches equal?

*January 4, 2017*

**algebra**

Could you please help? What are the solutions of the compound inequality? 2x - 2 < - 12 or 2x+3 > 7 Is this one x < - 5 or x> 2 2x -1/3 +3 <= -4. Or 8x-2/2 -1 >= 6. This one is 2x-1 divided by 3 plus 3 is less than or equal to - 4 or 8x -2 divided by 2 minus ...

*January 2, 2017*

**math**

On the blueprints of Adam's office building, the length of his rectangular office space is 5 1/4 inches. If the actual length of Adam's office space is 10 1/2 feet, what is the scale of the blueprint?

*December 14, 2016*

**Math**

I don't know how to do my homework I'm in 4th grade and in Manchester gate in m's snyders class help me ppplllzzzz Its 2016

*December 14, 2016*

**chemistry**

Is this balanced properly 2H2O2----> 2H2O +O2 Thank you for the reactions of zinc and acetic acid. REAL QUESTION, if I was to rub all the copper off of a new penny down to the zinc, what would be the appearance of the zinc if I left it in vinegar (acetic acid ) for 30min. I...

*November 13, 2016*

**chemistry**

Dr Bob, Sorry about this penny thing, but if I was to put pure zinc into acetic acid, what would happen to the zinc?

*November 13, 2016*

**Chemisry**

If you put copper coated penny 1983or newer, in vinegar, it turns blackish green. If you rub the copper off half the penny first and expose the zinc, put the penny in vinegar, will the results change? Thank you.

*November 13, 2016*

**Math**

How many letters are there in the correct answer for this question? a. One b. Two c. Three d. Four e Five

*November 8, 2016*

**Masth**

How the answer get Zero?

*November 8, 2016*

**Masth**

How many letters are there in the correct answer for this question? a. One b. Two c. Three d. Four e Five

*November 8, 2016*

**algebra**

Could you pls tell me why I have to change this sign. You should look at the sign like an equal sign. -2/5x -9 < 9/10 -2/5x < 99/10 x < -24.75 Why is this wrong? - I know the answer should be x> -24.75, but why? if this got sent twice, it is by error. Sorry.

*November 8, 2016*

**Algebra**

The plane is 300 miles west of city A. You need to go 1500 more miles to get to 1800 miles west of city A. The plane is flying 400 mph. So, 400x= 1500. 400 being speed, x being hours, and 1500 being miles. so, you get 3.75 hours. You need to change the .75 hours into minutes, ...

*November 8, 2016*

**algebra**

Could you pls tell me why I have to change this sign. You should look at the sign like an equal sign. -2/5x -9 < 9/10 -2/5x < 99/10 x < -24.75 Why is this wrong? - I know the answer should be x> -24.75, but why?

*November 8, 2016*

**Maths**

Anne & Tom competed in the 200m long distance swimming race. After the first 50 meters, Anne had gained 2 seconds against Tom's time. Over the next three laps, Tom gained 1.5 seconds, then lost 2.1 seconds and then gained 1.7 seconds. Who is the winner and by how much?

*November 1, 2016*

**Matrh**

Anne & Tom competed in the 200m long distance swimming race. After the first 50 meters, Anne had gained 2 seconds against Tom's time. Over the next three laps, Tom gained 1.5 seconds, then lost 2.1 seconds and then gained 1.7 seconds. Who is the winner and by how much?

*November 1, 2016*

**English**

I would say shouldn't. They taught me, if you read it without the n't, anad say should not or ought not, should not sounds correct. I probably learned that rule 10 years ago and it usually works. Wait for Ms. Sue though.

*October 30, 2016*

**Math**

Sorry, I meant half of 82.. so in 10x+1=41. Anyway, x= 10. Hope I caught you in time.

*October 30, 2016*

**Math**

POS= 1/2 of 82, so 10x+1= 42. You can do that. A bisector splits something into 2 equal halves. If you can't get it , draw a picture, it helps. if you are in Geometry, go to you tube videos and watch yay math videos. They saved me last year.

*October 30, 2016*

**US History**

If you have a map of 19th century US and the names of the states are changed to Irish names, ie: Irish Sea , Mulligan, etc. And the question was to compare the map to a typical US map, would you answer with just explaining the obvious changes, or is there some hidden message ...

*October 30, 2016*

**algebra 2**

I don't know if he does algebra, but look for Yay Math videos on U tube. He saved me in Geometry last year. He could be a little annoying, but he is a great teacher. Hope this helps.

*October 30, 2016*

**math**

Give reason 8454 is divisible by 6

*October 24, 2016*

**chemistry**

Back to the atomic emmission spectrum and the atomic theory. in the 1900s, scientists observed that when a gaseous element, such as hydrogen was subjected to an electric discarge that the atoms emitted electromagnetic radiation. The light emmitted could be separated into ...

*October 15, 2016*

**chemistry**

Explain how understanding of the atomic emmission spectrum led to developement of the atomic theory. The emmissions spectrum for each element is unique. You can identify an eleement by its spectrum. The atomic theory states that all atoms of a given element are identical. The ...

*October 15, 2016*

**chemistry**

Element x Isotope 55x 60% Isotope 56x 30% Isotope. 57x 10% 55× 60 =3300 56×30=1650 57× 10= 570 Add them up5520 divide by 100 the atomic weight of x is 55.2 Pls check if this is correct , answer and method

*October 14, 2016*

**chemistry,**

Could you pls check back a few questions. The first 1 or 2 digits in each nmber is the family number, so the numbers do not go on a consistant trend. Thank you

*October 13, 2016*

**chemistry**

For the elements in row 2 of the PT discover the relationship between ionization and the family number of the element Element. Family. Ionization Ener Lithium. 1 13.6 beryllium. 2. 9.3 boron. 13. 8.3 carbon. 1 4. 11.27 nitrogen. 15 14.53 oxygen. 16. 13.62 fluorine. 17. 17.42 ...

*October 13, 2016*

**connections Academy sucks**

I go there also, and the workload is impossible. If Iit only took him 1 hour, it would have taken me a day and a half. He probably used outside sources or run his work through check my work.

*October 13, 2016*

**chemistry**

Could you pls just answer this also. Does the family number coincide with the number of electrons in the outer shell of an atom in that family? I just got a brainstorm. Thanks again.

*October 12, 2016*

**chemistry**

When calling the families on the periodic chart by the top or first name in the column, where hydrogen is a non metal, and in family 13, where boron is a metaloid , is it correct to call those families the hydrogen or lithium family or/ and the boron family and for family 14, ...

*October 12, 2016*

**Social Studies**

1 - How does one person become a citizen? (Select 2) - a person is born in the United States - a person of foreign birth is granted citizenship after living in the U.S. for 5 years - a person of foreign birth successfully completes the naturalization process ** - a person ...

*October 6, 2016*

**Chemistry**

Also, I had a question a ways back, it may havebeem skipped over, Does helium has an ionic radius? Thank you

*October 6, 2016*

**Chemistry**

Is the atomic mass or atomic weight on the periodic table written in grams.

*October 6, 2016*

**Chemistry**

Does helium have an ionic radius? I searched and looked in an old Chem book, and come up empty. Hydrogen is not listed either. Is there a specific reason for this? Thank you.

*October 5, 2016*

**US History**

Could you pls check this time line 1, king George issues Proclamation of 1763 2, stamp act 3. Sons of Liberty 4. Boston Massacre 5. Boston Tea Party 6, coersive acts 7, 1st continental congress 8. 2nd continental congree 9. First sho of American revolution 10. Bunker hill ...

*September 24, 2016*

**Chemistry**

When you mixand separate CaCO3 and SiO2 with acetic acid-vinegar, it is a chemical reaction. It bubbles and CO2 is produced. What property of CaCO3 causes this to happen? Could you explain this to me pls. I am guessing the acetic acid reacts with one of the acetic acid, but ...

*September 21, 2016*

**Math**

the Pythagorean theorem a square + b square = c square a square + x square = 4 square how to find x square?

*September 18, 2016*

**Math**

what is the smallest number that 54 can be multiplied by to give a perfect square?

*September 15, 2016*

**algebra**

The width of a rectangle is 5 less than twice its length. If the area of the rectangle is 79 cm22, what is the length of the diagonal?

*September 11, 2016*

**algera**

A cash register contains only ten dollar and fifty dollar bills. It contains three times as many ten dollar bills as fifty dollar bills and the total amount of money in the cash register is $2,080. How many ten dollar bills are in the cash register?

*September 11, 2016*

**math or chemistry**

5.4 x10^-2 by 2.5 x10^-3 by 7.9 x10^-3m volume = 106.65 x10-8m^3 Check pls yesterday you said 106.65 x10^-6. If you add 2+3+3 you get 8 is that right? Just want to make sure I'm doing it right. Thank you. I may have witten it differently.

*September 10, 2016*

**chemistry**

Sig figs 33.067. 5 sig figs .0908. 3sig figs 1099. 4 .0087. 2 check pls

*September 10, 2016*

**math or chemistry**

Check pls. 5.4 x 10^-2 by 2.5 x 10^-3 by 7.9 x10^-3 m volume = 107.44 x 10^-8 m^3

*September 10, 2016*

**math**

three fireworks are fired at the same time. The first one is fired every 64 seconds, the second one is fired every 84 seconds and the third one is fired every 96 seconds. How many seconds after they start will it take until all three fireworks are again fired together?

*September 9, 2016*

**Chemistry**

Confused, conflicting texts when you are finding % error for density formula: experienced value-accepted value/ accepted value ×100. Does the ×100 cancel out the percent sign? EX; 7.28g/mL-6.54g/mL/6.54g/mL ×100. Is the answer 11.31 or 11.31% The lab video ...

*September 7, 2016*

**chemistry**

What particle is needed to complete this equation 14/7N+ _______=14/7C+ 1/1H I think it is a beta particle because of beta decay and transmutation. I could be really off because this chapter is really confusing me.

*May 30, 2016*

**chemistry**

If I have a sample from doing a half lfe lab with m&ms, not timed, just pulling out decayed or m&ms with rhe m on top, how do I calculate the half life using t1/2=(.693)/k formula. Do I have to do this 9 times as it took 9 trys to use up all the m&ms. I am not really sure what...

*May 29, 2016*

**W. History**

I know what the domino threty is. Question is, What 3 aspects of foreign policy do we see the domino theory reflected? I assume they are talking from 60's to 70's. I don't like to submit w/o an answer, but if someone could help, I'd be extremely appreciative. ...

*May 18, 2016*

**Grammar**

is alert oriented

*May 15, 2016*

**Medical Transcription Editing**

vomiting

*May 15, 2016*

**Medical Transcription Editing**

pain discomfort is (auxillary verb)

*May 15, 2016*

**geometry and trig**

If a cylinder with a 4 inch diameter and a 6 inch height holds 1 pound of oatmeal. How much oatmeal will a cylinder (similar) with a 10 inch diameter hold? Volume of 4 in-----24pi volume of 10 in----137pi I get 91 oz choiced are37,44,74, 192

*May 10, 2016*

**language arts**

Thank you!!! I'm literally screaming and jumping! :)

*May 3, 2016*

**language arts**

1. What is the prepositional phrase in the sentence: The family drove to the store. a. the family drove b. drove to the store c. the family d. to the store *** 2. What is the appositive phrase in this sentence: My mother, Rebecca, loves to eat pumpkin pie. a. Rebecca *** b. my...

*May 3, 2016*

**Geometry**

7 is the hypotenuse. 4 and 6 are either opposite to or adjacent to angle A. Tangent is opposite/adjacent. Use 4 and 7 to fill in opposite/ adjacent depending on their location.

*April 29, 2016*

**Chemistry**

One more, confused How can you tell by the periodic chart which ions of metals are most easily reduced or oxidized. A website or video would be fine. I know it is quite involved. thanks again

*April 29, 2016*

**chemistry**

Dr Bob Could you check this please? Voltaic cell---cathode is positive, accepts electrons, reduced, anode is negative, gives up electrons and is oxidized Electrolytic cell------cathode is negative, accepts electrons and is reduced. Anode is positive, givesup electrons and is ...

*April 29, 2016*

**Chemistry**

A 110g piece of copper is heated and the temperature changes from 38C to 172C. The heat absorbed is 686 cal. What is the specific heat of copper. I think the answer is .385, but I have tried 100 different ways to get this answer or anything close, and I am lost..it is just a ...

*April 17, 2016*

**chemistry**

What is the equilibrium constant for 2A + 3B (double arrow) =4C Is it (C)^c/ (A)^a (B)^b

*April 17, 2016*

**chemistry**

Calculate the energy needed to produce 10 moles of Cl2O7 using this balanced equation. 2Cl +70+ 100kCal==2ClO7 please explain steps if I needed to calculate for 7 moles, how would it change?

*April 16, 2016*

**Biology , AP Biology**

Answer is a

*April 16, 2016*

**Math**

A student cuts 1/3 of a coil of wire. He then cuts out another piece that was 8 meters long (I assume from the remaining coil). The two pieces of cut off wire are only half the total length of the wire. How long was the coil before the student cut it? I am getting 25, 50, to ...

*April 14, 2016*

**life orientation**

Need help with the conclusion plzzz

*April 14, 2016*

**science (correct please)**

B D B B A

*April 13, 2016*

**Science**

What is anything that has mass and takes up space? 1) Weight 2) Volume 3) Density 4) Matter When you measure the boiling point of mercury, you are investigating a ____. 1) Chemical change 2) Chemical property 3) Physical change 4) Physical property Ab object weighing 90 N has ...

*April 6, 2016*

**geometry and trig**

I figured out my mistake. With thearea of the triangle, I forgot the .5 thanks steve, sometimes you need another perspective.

*March 30, 2016*

**geometry and trig**

I have a regular octagon with a radius of 9. I have split the 8 pie slices into right angles--leaving angles 90, 67.5, and 22.5. I looked for the sine of 22.5 opp/hyp and get .38. Then the oppositeside is 6.84. I can't get the right answer, what am I doing wrong? Thanks

*March 30, 2016*

**chemistry**

Make the conversion 8.5 x10^2 cal to Calorie 4.5x10^-1kj to calories

*March 28, 2016*

**chemistry**

Ould you please offer me some insight to this, Calculate the hydrogen ion concentration (H+) for the aqueous solution in which (OH-) is1×10-15 mol/L. Is this solution acidic, basic or neutral? Thanks in advance

*March 20, 2016*

**chemistry**

Then the answer would be 4828 grams, right. I was using 2 molecules of SO4. What is the mass of Na2SO4 needed to make 8.5L of 4.0 M solution?

*March 20, 2016*

**chemistry**

What mass of Na2SO4 is needed to make 8.5L of 4.0M solution? Is the answer 7480 grams?

*March 20, 2016*

**Chemistry**

What is the maximum amount of KCl that can disolve in 500 g of warer? The solubility of KCl is 34g/100 g H2O at 20 degrees C.

*March 19, 2016*

**chemistry**

Dr Bob, Thanks for your help. Ihad googled for 3 hours before asking you. For future reference, if anyone asks this question again, 10th grade chemistry, I found a video on You Tube that makes it easy to understand. It is, The Sci Guys, Ph indicator, acid-base indicator. ...

*March 5, 2016*

**chemistry**

Thanks for your help. I did google for 3 hours before I came here. You asked me to specify the lab I was doing so I did. Thank you again.

*March 5, 2016*

**chemistry**

In the red cabbage lab, we just took the cabbage juice and in 5 separate cups mixed it with 5 different liquids, ex: coke, milk, cleaning agent, etc, and matched the color to a ph chart to tell if it was a base or an acid. Simple lab. The question needs a relatively simple ...

*March 5, 2016*

**Chemistry**

Explain the chemical changes that occur in the red cabbage lab that changes the color of the cabbage juice. I know it has something to do with the hydrogen ions and maybe something to do with the electrons, but I don't understand what or how to answer this question

*March 4, 2016*

**chemistry**

what chemical changes are responsible for the color changes in the red cabbage lab?

*March 4, 2016*

**Social Studies**

Thanks Everybody!

*February 26, 2016*

**help me please**

What steps take place during DNA replication

*January 12, 2016*

**english grammar**

I am very sorry. What does the adverb very modify

*December 8, 2015*

**Grammar**

I am very sorry. What does the adverb very modify.

*December 5, 2015*

**English**

Thanks

*November 11, 2015*

**English**

I looked it up and it says become is ALWAYS a linking verb. It seems confusing because you would expect a linking verb to link 2 verbs as in: has become, had jumped, and became is alone. It is not has become.

*November 11, 2015*

**English**

Action because there is not any other verbs with it.

*November 11, 2015*

**English**

White House pets become almost as well known as their owners, what type o verb is become?

*November 11, 2015*

**English**

Whe Abe Lincoln was president, he had a turkey. what type of pronoun is he?

*November 11, 2015*

**English**

Teddy Roosevelt kept a pet snake. What type of noun is snake.

*November 11, 2015*

**Health**

Salted caramel is right

*November 6, 2015*

**AP 1 Physics**

A motorcycle has a constant speed of 25.0 m/s as it passes over the top of a hill whose radius of curvature is 144 m. The mass of the motorcycle and driver is 326 kg. Find the magnitudes of the following. Centripetal force: mv^2/r = 1414.93 N Normal force: ?? I tried N = mg...

*November 3, 2015*

**english**

Kiki is wrong

*October 29, 2015*

**business**

compare and contrast Rational (formal) model for strategy- emergent strategy

*October 11, 2015*

**human resources**

prepare HR plan for the production and line department

*October 11, 2015*