Monday

February 20, 2017
Number of results: 151,410

**chemistry-Please confirm this**

I'm pretty sure that OH- has a bond order of 1. OH+ has a bond oder of 1. confirm this please.

*May 25, 2008 by Tom*

**Chemistry**

Find the pH of 1.0E-8 M H2S04 (H2SO4 <==> 2H^+ + SO4^2-) I have got answer to be 7.70, can you confirm the answer for me please? If it is not good, i'll be very grateful if you could leave some guides.

*September 6, 2014 by Matt*

**Algebra**

Please confirm if I did the follow problems correctly: A) Find the sum or difference. (5a – 3b) + (2a + 6b)= 7a + 9b Answer: = 7a + 9b B) Let’s work a few of these (FOIL) 1) (x+2) (x+8) = x 10 Answer: x10 2.) (x+5) (x-7) = x + 11 Answer: x + 11 3.) (2x+4) (2x-3) = 4x + 7 ...

*April 3, 2011 by Jeannie*

**Algrebra**

Please confirm if I did the follow problems correctly: A) Find the sum or difference. (5a – 3b) + (2a + 6b)= 7a + 9b Answer: = 7a + 9b B) Let’s work a few of these (FOIL) 1) (x+2) (x+8) = x 10 Answer: x10 2.) (x+5) (x-7) = x + 11 Answer: x + 11 3.) (2x+4) (2x-3) = 4x + 7 ...

*April 3, 2011 by Jeannie*

**Chemistry**

At a certain temperature, the Kp for the decomposition of H2S is 0.832 H2S (g) <-- --> H2 (g) + S (g) Initially, only H2S is present at a pressue of 0.121 atm in a closed container. what is the total pressure in the container at equilibrium? Please tell me how to do it ...

*March 9, 2012 by Kylie*

**Chemistry**

At a certain temperature, the Kp for the decomposition of H2S is 0.832 H2S (g) <-- --> H2 (g) + S (g) Initially, only H2S is present at a pressue of 0.121 atm in a closed container. what is the total pressure in the container at equilibrium? Please tell me how to do it ...

*March 9, 2012 by Jerry*

**Stats**

Think I know the answer, but can someone please confirm... Find the value of a that corresponds to a confidence level of 84%. Answer: 0.16???

*September 13, 2008 by Cassy*

**math**

please confirm this answer also: [(4+20)/(4*2)]+[(2*8)/4]=7 is the answer 7?

*October 22, 2013 by Anonymous*

**Chemistry - PLEASE CONFIRM ANSWER.**

determine the mass of CO that is produced when 45.6g of CH4 react with 73.2g of O2. 2CH4 + 3O2 ---->2CO + 4H2O nCH4 = 45.6 g/16.05 g/mol =2.84 mol nCO=2.84 mol mCO=n*M =2.84*28.01 =79.5 grams

*May 25, 2008 by Nicole*

**Chemistry**

Does SF5 exhibit hypervalency? I believe yes as it has an extended octet...please confirm this for me, thanks for your help!

*September 28, 2011 by Cassie*

**Math - check answer**

Given v = 4t - 9t3, find the acceleration when t = 1 s. acceleration in m/s2 = My Answer V'=4-27t2 V"= -54t V"(1)= -54 acceleration in m/s2 = positive 54 Can you please confirm this is correct???? Thanks

*January 29, 2013 by Brownie*

**Math - check answer**

Given v = 2t3 + 87t2 - 636, determine the acceleration for t= 1 s. acceleration in m/s2 = My Answer v'= 6t^2+174t V"= 12t V"(1) = 12 acceleration in m/s2 = 12 Can you please confirm this is correct.. Thanks!

*January 29, 2013 by Brownie*

**Math - check answer**

Given s = 4t + 11t3, find the velocity when t = 1 s. velocity in m/s = My Answer: S'=4+33t^2 =4+33 =4+33 =37 velocity in m/s = 37 Can you please confirm this is correct. Thank you

*January 29, 2013 by Brownie*

**Math**

For a track and field athlete who can jump vertically, his distance above the ground is given by the formula s = 3.3t - 4.9t2. What is his initial velocity? velocity in m/s = My Answer S'= 3.3-9.8t S'(0) = 3.3 velocity in m/s = 3.3 Can you please confirm this answer Thanks

*January 29, 2013 by Brownie*

**GEOMETRY**

What is the area of a triangle? 7 ft by 3 ft with 55 degrees angle Please confirm my answer or tell me what I did wrong... • 6.0 ft² • 8.6 ft² • 15.0 ft² • 17.2 ft² my answer

*March 24, 2015 by Anonymous*

**Geometry (Please check my work)**

Find the image of O (-2,-1) after two reflections, first across the line y=-5, and then across the line x=1. I believe the answer should be (-1,-6) Can someone please confirm?

*November 2, 2016 by Sami*

**Chemistry**

What is the pH of a solution prepared by dissolving 1.23g of 2-nitrophenol (FM 139.11) in 0.250 L? Well so, i calculated the no.moles of 2-nitrophenol, and divided it by 0.250, to get the molarity which was 3.53E-2. Since the molar ratio of dissociation is 1:1, i assumed [H+] ...

*August 31, 2014 by John*

**algebra**

is there even a solution to this problem: x^2 − 10x + 20 = 0 I think this answer is no solution , please confirm I am right...

*October 21, 2013 by Anonymous*

**Calculus**

Find the limit. lim 5-x/(x^2-25) x-->5 Here is the work I have so far: lim 5-x/(x^2-25) = lim 5-x/(x-5)(x+5) x-->5 x-->5 lim (1/x+5) = lim 1/10 x-->5 x-->5 I just wanted to double check with someone and see if the answer is supposed to be positive or negative. ...

*January 22, 2014 by S*

**Math - check answer**

Given s = 10 - 10t2 + 45t3, determine the velocity when t = 1 s. velocity in m/s = My Answer S'= 0-20t + 135t^2 S'(1) = -20+135 = 115 velocity in m/s = 115 Can you please confirm this is correct. Thanks!

*January 29, 2013 by Brownie*

**Math**

An atomic particle moves in a linear motion according to the formula s = 19 - 14t2 + 4t3. Determine the particle's velocity at the end of 2.9 seconds. velocity in m/s = My Answer S'= 0-28t+12t^2 S'(2.9) = 0-28(2.9)+12( 2.9)^2 = 0-81.2+100.92 =19.72 Can you please confirm this ...

*January 29, 2013 by Brownie*

**Maths-Vectors Help!**

Please help confirm if I got this problem correctly; 1)2jx(3i-4k) sol>> 2x3jxi - 2x4jxk = 6jxi - 8jxk = 6k - 8i 2) (i-2j)xk Solutn>> ixk - 2jxk = -j - 2i 3) (2i-4k)x(ix2j) solutn>>2ixi Please do help with this ONE yes, correct. On the third, break recheck if ...

*April 16, 2007 by Segun*

**chemistry**

Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) -----> PCl3 (g)+ Cl2(g) Kc= 1.80 at 250 degrees C A 0.463 mol sample of PCl5(g) is injected into an empty 4.80 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(...

*March 9, 2012 by Sarah*

**Physics**

A cricket ball rotates at 1800 rev/min as it travels through the space in a straight line at 160 km/hr. How many times does it revolve after traveling 20m? Can someone confirm with me if 13.5 revolutions in 20m is right. That's the answer i got too. If it's wrong can someone ...

*August 7, 2015 by Yoyo*

**Physics**

Just reposting. A cricket ball rotates at 1800 rev/min as it travels through the space in a straight line at 160 km/hr. How many times does it revolve after traveling 20m? Can someone confirm with me if 13.5 revolutions in 20m is right. That's the answer i got to. If it's ...

*August 8, 2015 by Yoyo*

**Math**

(8.86 + 1.0 * 10^-3) / (3.610 * 10^-3) Calculate the above formula, expressing the answer in scientific notation with the correct number of significant figures: 8.86 + 1.0 * 10^-3 = 8.86 + 0.0010 = 8.8610 = 8.86. 8.86/(3.610 * 10^-3) = 2454 2.454 * 10^3 Please confirm if I did...

*January 9, 2015 by John*

**calculus derivatives**

Please confirm: {(5x+2)^4/x^2-3x+1)^3}= 20(5x+2)^2(x^2-3x+1)^3 -3x^2(5x+2)^4 (x^2-3x+1)^2/(x^2-3x+1)^6

*July 19, 2012 by Laurie*

**Computer science**

Hi, Can someone please confirm the following for me .. This realtes to PSK or phase shift keying. Is it right that 8PSK uses eight different phase shifts each representing one of the eight patterns of three bits ... ?? Does it ehn follow that 256PSK uses 256 different phase ...

*April 3, 2011 by Oddie*

**Chemistry**

How do we use 2 indicators to confirm the pH of a solution?

*November 4, 2014 by John*

**chemistry-confirm please**

Only a chemist can be trusted with the combination to the safe containing a ton of money. The combination is the pH of solution A, followed by the pH of solution C. (for example: is the pH of solution A is 3.47 and the pH of solution C is 8.15 the combination to the safe is 3-...

*May 25, 2008 by Tom*

**Maths**

Hey! I have this problem - i'm currently working on Quadratics at school, and i got homework. One of the questions is 18^2+2px+32. I have to find the Value of P, the answer i got is P>+-24. Can someone please confirm this is correct?

*September 24, 2016 by Simon*

**Math**

A particle is projected along an inclined plane with a velocity given by the formula v = 4.4t2 + 10.1t -23.2. Determine the acceleration of the particle when t = 1.5 s. acceleration in m/s2 = My Answer V'=8.8t+10.1 V"=8.8 V"(1.5)= 8.8 acceleration in m/s2 = 8.8 Can you please ...

*January 29, 2013 by Brownie*

**biology**

The light reaction of photosynthesis is very similar to" a. the electron transport chain b. the TCA cycle c. Beta-oxidation I think the answer is A. Can someone confirm my answer

*February 11, 2009 by Anonymous*

**Math - check answer**

A rifle bullet is fired directly upward from the ground. Its height above the ground at any instant of time t is given by the formula, s = 63t - 9.8t2. Assuming there is no air resistance how high will the bullet rise? height in meters = My Answer S'= 63-19t s"=0-19.6 Height ...

*January 29, 2013 by Brownie*

**Physics/Boyles Law**

Please confirm/tidy up my fragile understanding as follows: Boyles Law is apparently now known by another name???? If I compressed the air in a room into a cylinder obviously everything that was in the room is now in the cylinder including the heat. As the heat out of a large ...

*October 12, 2007 by Mike*

**chemistry**

When combined with cupric ions (aq, 1M) which will produce the largest standard cell voltage? (Use data from table 20.1, and Appendix D page A28-A29 in Petrucci) 1. ) Mn(s) 2. ) MnCl2(aq) 3. ) KMnO4(aq) 4. ) MnO2(s) the answer i got was MnCl2,,,,but im not sure if its right......

*December 1, 2009 by mandeep*

**Chemistry -Please help!**

Using MO theory (but w.o drawing a MO diagram) predict whether HHe or HHe+ would be more stable. I believe HHe+ would be more stable as the bond order would be 1 (i.e. BO=(2-0)/2) while BO for HHe is 1/2. Please confirm! thanks!

*September 28, 2011 by Cassie*

**chemistry**

When combined with cupric ions (aq, 1M) which will produce the largest standard cell voltage? (Use data from table 20.1, and Appendix D page A28-A29 in Petrucci) 1. ) Mn(s) 2. ) MnCl2(aq) 3. ) KMnO4(aq) 4. ) MnO2(s) the answer i got was MnO2,,,,but im not sure if its right......

*December 2, 2009 by mandeep*

**Differentiation**

Could someone confirm that the derivative of: ln(2x) is: 1/2x No answers please, just yes or no. Thanks if u= 2x d/dx ln u= 1/u du No. if u= 2x d/dx ln u= 1/u du No. Got it, thanks.

*June 30, 2007 by CharlieGolf*

**Pre-Calculus**

How do you confirm that f and g are inverses by showing that f(g(x))=x and g(f(x))=x ? Problem: f(x)=3x-2 and g(x)= x+2 --- 3 Please help, don't know where to begin?

*September 16, 2008 by House*

**algebra**

What is 4,756 divided by 32? I got 148.625 please confirm?

*March 17, 2011 by Jeannie*

**chemistry hw**

SOMEONE PLEASE HELP AND CONFIRM THE RIGHT ANSWER FOR ME...I HAVE ONE MORE ATTEMPT TO THIS PROBLEM AND I NEED HELP!!!!! PLEASE!!!!!!!!!!!!!!!!!!!! THANKS! In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied ...

*February 19, 2012 by Ariel*

**Physics**

Displacement is which of the following types of quantities? A. vector B. scalar C. magnitude D. dimensional My answer is A. vector...I just want to confirm this is the correct answer.

*July 16, 2008 by Mark*

**Algebra**

Do the matrixes of -1 4 3 5 2 0 -6 1 multiplyed by 2 0 1 4 3 -2 -5 1 equal -3/4? Thanks, I just want to confirm that my answer is right (or wrong)

*January 5, 2009 by Saria*

**Calculus**

int(dx/(x^2+9)) u = x/3 Use the indicated substitution (above) to evaluate the integral. Confirm answer by differentiation. Okay, so I found that du/dx is 1/3. dx is 3du. Just by looking at the integral I can tell this is some form of tan^-1(x), if we change it to int(1/(x^2+9...

*October 23, 2010 by Nikki*

**Chemistry**

At 389K, this reaction has a Kc value of 0.0682. 2X(g) + 2Y(g) <-> Z(g) .. Calculate Kp at 389K. Kp= this is what I did.. can somebody confirm or find any mistakes in my thought process? Kp = Kc(R)(T)^Delta n Delta n = (1)-(2+2) = -3 Kp = (0.0682)(0.08206)(398K)^-3 = 0....

*March 5, 2012 by Tracy*

**General Chemistry**

I have two questions about this problem, I understand how it's supposed to be done but I don't understand how my teacher came to this answer, so I was wondering if somebody could confirm or deny his answer here's the problem. Below what temperature is: I2(g) --> I2(s)...

*April 22, 2007 by Vesone*

**American Government**

Miranda v. Arizona (1966) A. Example of voting rights B. Example of racial - discrimination C. Example of criminal defendant case D. Example of a states rights case I think the answer is D. Please confirm

*December 4, 2013 by Sharon*

**College Algebra**

I need to divide this polynomial synthetically. I think I did it right, but can someone confirm if my answer is right or wrong? Polynomial: x^4 - x^3 + x^2 - x + 2 Divisor: x-2 My answer: x^3 + x^2 + 3x + 5 + 12 (remainder) ---- x-2 ( the x-2 in my answer is meant to go under ...

*April 18, 2010 by Sarah*

**Chemistry**

Dr Bob Can you please confirm for me that only NH3 has a boiling point that does not fit the general trend from these choices NH3 PH3 SbH3 AsH3 many thanks andy I am picking NH3 because of the reason that the larger the compound the greater the boiling point Am I right with my...

*May 11, 2010 by Andy*

**Chemistry**

Are there any chemical reactions or observations that involve sodium hydroxide or any other bases, but cannot be used to confirm its basic nature?

*November 16, 2014 by John*

**Maths**

A car depreciates in value by 15% for the first year and for each year later by 12% of its value at the beginning of that year. Calculate the percentage decrease in the value of the car after 3 years. Could someone please confirm the answer to be 38.048 because that,s what i ...

*February 15, 2017 by Zayn*

**ALGEBRA**

Factor each expression completely. show some sort of check to confirm your answer. (hint: think FOIL) x^2+11+30 x^2-5x-14 9x-16

*September 5, 2014 by Andra*

**pre-calculus 11**

The infinite series 1+3x +9x^2 +27x^3+.. has a sum of 4.The value of x is? so if 1/1-r I substitute 1/1-3x =4 so x=1/4 if someone could confirm that my answer is correct? thanks so much

*June 16, 2015 by george*

**Algebra (College)**

I need to divide this polynomial synthetically. I think I did it right, but can someone confirm if my answer is right or wrong? Polynomial: x^4 - x^3 + x^2 - x + 2 Divisor: x-2 My answer: x^3 + x^2 + 3x + 5 + 12 (remainder) ---- x-2

*April 18, 2010 by Sarah*

**Calculas**

Hi, can someone confirm if i got the right answer to this question. SO the region between curves y=x^2+1, y=2x^2-2 and the two axes, Is rotated around the Y-AXIS to form a solid glass vase. Determine the volume of the vase. I got 4*pi. Need confirmation if this is correct, if ...

*May 19, 2015 by Galagan*

**Grandpa need Math help**

Gettin to old to help a 13 yr old. I think I know the answer to the below but need to confirm it. Anyone that could assist this ol man would be much appreciated!!! How do the volume of prisms compare as the number of faces in the prisms increases? Does the volume remain the ...

*April 7, 2013 by Grandpa*

**Algrebra**

How do you insert grouping symbols to make this equation true? 14 divided by (5+2) +8=10 14/7=2+8=10 Please confirm, I really have an issue with Algebra

*March 20, 2011 by Jeannie*

**Physics**

A spaceship is on a straight-line path between the Earth and the Moon. At what distance from Earth is the net gravitational pull on the probe from the Earth and the moon zero? Mass of Earth = 6×10^24 kg. Mass of Moon = 7×10^22 kg. Can someone please confirm if my answer of ...

*August 9, 2015 by Yoyo*

**Chemistry**

How do I know which of these .1M solutions will have a pH less than 7? KF, NH4I, NaH2PO4, Fe(NO3)3 I am guessing all but KF is acidic...but if someone could confirm this and explain why that would be helpful

*February 24, 2010 by Mark*

**maths**

Graph theory question - is K1,3 the same as K4 my answer - i think yes because the numbers symbolise the number of vertices. can someone confirm and explain in detail .

*September 19, 2014 by prash*

**Chemistry**

which of the following compounds dissolve in water?? -Sodium Nitrate (NaNO3) - Sucrose (C12H22O11) - Sodium Chloride (NaCl) - Potassium Sulfate (K2SO4) - Ethanol (C2H5OH) - Sodium Bicarbonate (Baking Soda)(NaHCO3) - Calcium Sulfate (CaSO4) i did an experiment, but I was not ...

*September 25, 2009 by Liz*

**chemistry**

can someone confirm that the functional group of cocaine is the ch3n group. thanks

*January 11, 2009 by Valerie*

**Chemistry**

I did a lab in which I added ionic solutions to tap and distilled water and another ionic solution. Distilled water is the control because it does not react to any solutions since it doesn't contain ions. But one of the lab questions I need to answer is: These tests cannot ...

*November 16, 2008 by Fred*

**chemistry**

A reaction has ÄH = -378 kJ and ÄS = -37 J/K. Calculate ÄG at 25°C to confirm that the reaction is spontaneous. in kJ

*May 15, 2012 by maddy*

**Chemistry**

Using MO theory (but w.o drawing a MO diagram) predict whether HHe or HHe+ would be more stable. I believe HHe+ would be more stable as the bond order would be 1 (i.e. BO=(2-0)/2) while BO for HHe is 1/2. Please confirm! thanks!

*September 28, 2011 by Cassie*

**Chemistry**

Can you please someone check my answer for me? I don't know how to start thses answer. Chemistry is not my things. Please give me answers. :( a)Determine the number of grams in 0.750 moles of the compound Iron(II)phosphate: Fe3(PO4)2. Answer: ? b)How many atoms of iron are in ...

*March 31, 2010 by Anonymous*

**Chemistry**

Can you please someone check my answer for me? I don't know how to start thses answer. Chemistry is not my things. Please give me answers. :( a)Determine the number of grams in 0.750 moles of the compound Iron(II)phosphate: Fe3(PO4)2. answer: 129.68grams 357.477722g/mol is ...

*April 1, 2010 by Anonymous*

**math**

Ajax is 8 km due west of Oshawa. Uxbridge is 16 km NW of Oshawa. How far is it from Ajax to Uxbridge? Explain whether you have enough information to solve this problem. my answer was 13.856 km but not confident how I found the angle oshawa to begin with. I used Cos Oshawa = a/...

*August 21, 2011 by Dee*

**Math**

A car is projected directly up an incline and its location from its start point is given by the formula s = 9t - 5t2. Determine its initial velocity and initial acceleration. initial velocity in m/s = initial acceleration in m/s2 = My Answer s'=9-10t initial velocity in m/s = ...

*January 29, 2013 by Brownie*

**Chemistry**

Can someone confirm that I'd be doing this right? If an 0.520 m aqueous solution freezes at -3.00 C, what is the van't Hoff factor, i, of the solute? It says I can find the Kf values on a table. I had no idea which Kf value to use... so i just used water... is that right? If ...

*February 16, 2012 by David*

**Algebra**

Write 27/4 as a mixed number, I keep getting 6.75 but it does not seem correct, please confirm if it correct or if I am missing something.

*March 19, 2011 by Jeannie*

**CHEMISTRY HELLPPPP**

WHich of the following elements are semiconductors? Ge, Si, Te, Po, S, Al, Se, Ca i believe only Ge, Si, Te, and Se are semiconductors, can someone confirm this? did i miss or over look something

*April 22, 2007 by Anonymous*

**algebra**

Which of the following are examples of inferential statistics? Check all that apply. A.Finding the average (mean) of a set of numbers B.Testing every lightbulb produced by a company to confirm that each one works C.Testing random samples of lightbulbs produced by a company to ...

*April 17, 2012 by daryl*

**math**

the line y= o.15x+ 0.79 represents an estimate of the avgerage cost of gasoline for each year. The line 0.11x-y= -0.85 estimates the price of gasoline in Jan. of each yr. a) Do you expect the lines to be intersecting, parallel, or perpendicular? Explain your reasoning. b) Use ...

*September 11, 2008 by dawn*

**Chemistry**

What is the net ionic equation of reaction of MgCl2 with NaOH? I got the equation and then balanced it and then omitted the spectator ions and ended up with: Mg(OH)2(aq)--->Mg(OH) (s) I wanted to confirm to see if that was correct, thanks.

*September 26, 2012 by M*

**Math**

The voltage in a circuit is given by the formula V = 16t3 - 79t. Find the values for t for which V is a maximum or a minimum. larger t in seconds = smaller t in seconds = My Answer: V=16t^3-79t V'=48t^2-79 0=48t^2-79 Sq root of 1.645833 = t 1.2829= t V''=96t positive therefore...

*January 29, 2013 by Ashley*

**Math Max min problems**

The power P delivered to a load by a current of i amperes through a resistance of 19 ohms, when 110 volts are supplied at one end of the line, is given by the formula P = 110i - 19i2 . Determine the maximum power that can be delivered. maximum power in watts = My Answer: My ...

*January 29, 2013 by Ashley*

**BMB**

1.You have a mixture of protein A and protein B in a buffer of pH 7. The pI of protein A is 3 and the pI of protein B is 8. The molecular weight is the same. (a) What kind of column chromatograph would you use to separate them? Explain your answer in 2-3 sentences. (b) Can you...

*November 4, 2008 by jess*

**8th Grade Algebra: Answer Check**

Find the length of the 3rd side of each right triangle. 1. 8^2+15^2=c^2 Answer: c=17 2. 5^2+b^2=13^2 Answer: b=12 3. 9^2+13^2=c^2 Answer: c~15.81 Simplify. Assume that all variables are nonnegative. { this means square root 4. {12 Answer: 2{3 5. 2{75 Answer: 10{3 6. -3{72 ...

*January 20, 2009 by Joy*

**math-algebra please help**

The line y=0.15x+0.79 represents an estimate of the average cost of gasoline each year. The line 0.11x-y=-0.85 estimates the price of gasoline in January of each year (“Consumer price index,” 2006). a. Do you expect the lines to be intersecting, parallel, or perpendicular...

*July 6, 2010 by Michelle*

**Business Math**

Please confirm if I did this correctly: What is the Principal? Principal $21250 X 10% 2,125 What is the total amount paid by the consumer? 2,125 x 3.5 years 7,437.5 +21,250.0 28,687.50

*June 4, 2011 by JC*

**chemistry to MathMate**

Chemistry - CJ, Tuesday, March 31, 2015 at 10:53pm I am experiencing a major block.... I can't say.... 1micrometer= 1000nm 5micrometer= x..... because I'll get back the same thing So please help me, tell me the answer please.

*March 31, 2015 by CJ*

**8th Grade Algebra: Answer Check #2**

Add or Subtract (Radicals) { this means squared 1.3{2 + 4{2 Answer: 7{2 2. 8{3 + 3{3 Answer: 11{3 3. 7{5 - 3{5 Answer: 4{5 4. 8{2 - 5{2 Answer: 3{2 5. 6{x + 7{x Answer: 13{x 6. 9{y + 3{y Answer: 12{y Multiply 7. -3x^2(4x^2-3x-5) Answer: 12x^2 8.(3b+5)(b-3) Answer: 3b^2-4b-15 9...

*January 20, 2009 by Joy*

**Navigation/maths**

I am curious to know what "sight reduction tables" are: I assume they give distance and bearing (azimuth) from one known (or assumed)location on the surface of the earth to another to the accuracy of the tables. Please can someone confirm or correct my assumption. Thanks Mike

*January 11, 2008 by Mike*

**Chemistry**

The value of delta H for the reaction below is -1107kj. 2Ba (s) + O2 (g) -> 2BaO (s) How many kJ of heat are released when 5.75 g of BaO (s) is produced? Here is how I approached this problem: 1. Converted 5.75 g of BaO to mol: 5.75g x (1mol BaO/153.3g BaO) = 0.0375 mol BaO...

*May 23, 2011 by Thao*

**math trigonometry**

From on point on the ground the angle of elevation to the peak of a mountain is 10.38 degrees and from another pont 15,560 feet closer to the mountain, the anle of elevation is 14.67 degrees. Both point are due south of the mountain. What is the height of the mountain? My ...

*July 3, 2006 by katie*

**chemistry**

This is an assesment question and im really bad at these, i did the first two questions and now i am stuck. They ask you to design a series of experiments that can be used to confirm the structure and organization of the table of relative strengths of acids and bases. the want...

*November 24, 2012 by Tara*

**Math for Educators**

24five x 3five ------ 132five 27eight 65eight +43eight ------- 157eight 75eight -37eight ------- 36eight 1213five/3five??? -If someone could please confirm my answers for the others as well as help me with the last division problem thank you! these are all equating in ...

*June 17, 2013 by Kelly*

**Accounting**

The Fairport Machine Shop wants to develop a cost estimating equation for its monthly cost of electricity. It has the following data: Cost of Electricity (Y) $13,000 $15,000 $17,000 $14,500 Direct Labor-Hours (X) 1,500 1,700 2,000 1,600 What would be the best equation using ...

*November 19, 2014 by Serenity*

**Chemistry**

according to the bohr model of the hydrogen atom, what is the closest an electron can get to the nucleus? What is the farthest it can get from the nucleus? ( if the latter answer seems absurb, it might amuse you to know that it is the same value predicted by present-day ...

*November 28, 2012 by Anonymous*

**chemistry/stiochiometry**

could someone please answer my chemistry/stoichiometry questions below both "anonymous one just chemistry on todays date

*March 16, 2011 by "anonymous"*

**Mathematics**

Hi, Can someone check this for me .. please A tuning fork has a wavelength 0f 136 centimetres. Given that the speed of sound is 340 metres per second what is the frequency of the tuning fork ?? Frequency = speed / wavelength Then 340 / 1.36m (136cm) = 250 Hz Thank you try to ...

*May 28, 2011 by Alan*

**accounting**

The auditors may decide to confirm accounts payable on an audit engagement. Describe two reasons why the confirmation of accounts payable is not a genreally accepted auditing procedure, describe the audit crcumstances in which the auditors are likely to decide to confirm ...

*June 7, 2009 by kew*

**ENGLISH: types of business writing**

Can someone check gammar, punctuatiion and structure please. Draft an email of at least four complete sentences to Deb Walker the designated trainer: Confirm the arrangements for the seminar providing only the information she needs to arrive at the right place at the right ...

*April 4, 2012 by danny*

**CHEMISTRY- answer check**

A 0.386g sample of a protein was dissolved in water and made up to a volume of 60mL at 21.0°C. At this temperature the osmotic pressure of this solution was 1.24mmHg. Calculate the molecular mass of the protein 12682 g mol-1 95025 g mol-1 9627613 g mol-1 5706 g mol-1 125.17 g...

*October 9, 2010 by lulu*

**Biology/Chemistry**

During a “perm”, disulfide bonds can be broken and reformed using which treatments, respectively? I think the answer is a. but can someone confirm this? a. an oxidizing agent followed by a reducing agent b. a reducing agent followed by the use of water c. an oxidizing ...

*September 26, 2009 by Critical*

**Science**

What Temperature would you get after the First 5 Minutes of Putting 4 Ices into a 99 degree warm water? After The Second 5 MInutes? YOu Might need to do this experiment at home. But May anyone Please Help and tell me it in Farenheit so i can confirm my Answers.

*December 13, 2011 by Science*

**science**

which of the following has both dispersion forces and dipole-dipole forces? Br2 HCl H2 CO2 BCl3 I reckon its HCl can anyone confirm please

*May 11, 2010 by Anonymous*

**math**

The angle of depression of a boat from the mid-point of a vertical cliff is 35 degree.if the boat is 120m from the foot of the cliff,calculate the height of the cliff.help me confirm my answer. Tan35=x/120 x=120tan35 =84.02m

*July 15, 2015 by Bayo*