Friday

July 1, 2016
Total # Posts: 2,503

**histidine basic/nonbasic nitrogens**

For the amino acid histidine, the nitrogen with the H attached to it is not basic (since you can draw out the resonance for it). But the other nitrogen that has a double bond is not basic. Why is this?? I can draw out the resonance for the double bonded nitrogen as well.. so ...
*June 6, 2009*

**amino acids**

sorry i was referring to hisidine
*June 6, 2009*

**amino acids**

For the amino acid Lysine, the nitrogen with the H attached to it is not basic (since you can draw out the resonance for it). But the other nitrogen that has a double bond is not basic. Why is this?? I can draw out the resonance for the double bonded nitrogen as well.. so ...
*June 6, 2009*

**math**

1/4^n then change from positive to negative alternatively. then sequence shown goes to n=5.. therefore the next value at n=6 should be -1/4^6 = -1/1024
*June 5, 2009*

**alanine r or s configuration?**

is alanines configuration S?
*June 5, 2009*

**Lysine Basic/Nonbasic Hydrogens**

For the amino acid Lysine, the nitrogen with the H attached to it is not basic (since you can draw out the resonance for it). But the other nitrogen that has a double bond is not basic. Why is this?? I can draw out the resonance for the double bonded nitrogen as well.. so ...
*June 5, 2009*

**chemistry**

a. neither b. products/reactants <1 therefore there is more reactants, so the reaction will try to proceed forward to increase products in order to get to equilibrium. c. opposite of b
*June 5, 2009*

**Algebra**

Sorry about that! here it is again! 1/x+2 + 4/x^2-4
*June 3, 2009*

**Algebra**

Please Simplify: 1 4 --- + --- x+2 x^2-4
*June 3, 2009*

**7th grade**

I need to find out the missing variable. 10 x n - 55 = 155 n=
*June 2, 2009*

**English**

ya so I have to write this essay and I'm completly lost Were reading the story The Stranger which I have already finished about a week ago I remember this guy who meets this one guy and a dog and the main charecter dosent' care if he gets maried to this girl who want ...
*May 31, 2009*

**Algebra 2**

thank you so much for the help earlier can you tell me if I did this one right 2/(cuberroot16)= (2cuberoot16)/16 it seems to simple
*May 31, 2009*

**Algebra 2**

could you walk me thorugh these problems simplfy square root 18 - 3 times sqaure root of 50 plus 5 times the square root of 80 - 2 times the square root of 125 I'm having troubles with the square root of 80 all of the other radicals can be simplfified with a 2 in the ...
*May 31, 2009*

**Physics**

I'm haivng troulbe proving the deriviation of this formula on my own... could you please help me derive the proof of the formula or maybe show me one thansk... I need to prove this formula period of a mass spring system in simple harmonic motion T = 2 pi square root of (m/...
*May 30, 2009*

**General**

I do not know what subject to put this uh ok how do I put this into one cell into microsoft excell into one cell - .49 m when i put "-" it thinks I'm entering a formula which is not what I'm tyring to do i want negetive .49 m m being meters into one cell and ...
*May 30, 2009*

**Math**

How do I transform this into simple radical form... I have no idea how to do this could you please tell me the logic behind how you do this and step by step thanks (5^(1/2)-3^(1/2))^2 thanks again Also can you tell me how to transform this one into radical form also 18^(1/2)-3...
*May 28, 2009*

**6th grade genetics**

I think that would be called heredity.
*May 26, 2009*

**Statistics**

Suppose 52 of the students in class have a calculator and 14 have a computer. It is known that 4 do not have either a computer or calc and there are 64 students in the class. Find the probability that a randomly chosen student has a computer AND a calculator. I know this is an...
*May 26, 2009*

**Statistics**

You have heard the commercial for the restaurant that lets you pick any 3 appetizers, any of the 6 entree items and then a dessert. You have been told there are 72 different meal options. How many desserts are available? I don't understand how to calculate this. I know how...
*May 26, 2009*

**Pre-Algebra[URGENT]**

-5w(2w^2-w-9)
*May 26, 2009*

**7th Grade Life Science**

An exoskeleton.
*May 22, 2009*

**English**

I remember i was in English Honors in the 9th grade and we would have stupid words like that on our vocab list. Just goes to show how retarded the school system is and how little they expect of us.
*May 21, 2009*

**chemistry help**

Describe how you would prepare 250.0 mL of a 0.500 M solution of NaCl by using apparatus found in a chemistry lab.
*May 20, 2009*

**grammar**

I have to identify each word in the following sentence with a "part of speech"..... "The Southwest is a section of the country rich in natrual wonders". What is "The" and "A"?
*May 19, 2009*

**algebra**

solve 0.07-0.003x+0.2=1.02
*April 30, 2009*

**algebra**

need help asap please??!!
*April 29, 2009*

**algebra**

solve 0.07-0.003x+0.2=1.02
*April 29, 2009*

**chemistry**

Explain why a suspension is considered a heterogeneous mixture?
*April 28, 2009*

**Trig Proofs**

Please solve this proof Tan(pi/4 +x)+ Tan(pi/4+x)= 2Sec2x
*April 27, 2009*

**Trig Proofs**

Thanks so much for the help=)
*April 27, 2009*

**Trig Proofs**

Please Help: please solve this proof: cosx- cosy = -2sin(x+y/2)sin(x-y/2)
*April 27, 2009*

**algebra**

-2x7= -3 +t+24 -14= =3+t+24 -11= t+24 -35= t
*April 27, 2009*

**Algebra**

Can someone please check my work for me. Q: Plot the graph of the equations 2x - 3y = 5 and 4x - 6y = 21 and interpret the result. A: 6(2x ¨C 3y = 5) = 12x ¨C 18y = 30 3(4x - 6y = 21) = 12x - 18y = 63 12x ¨C 18y = 30 + 12x - 18y = 63 0 ¡Ù 93
*April 26, 2009*

**Algebra**

would it be correct to say that the equations are not independent therefore they have an infinite solution set.
*April 25, 2009*

**Algebra**

so can you tell me if this is correct.... 4x – 5y = 14 -12x + 15y = -42 15(4x – 5y = 14) = 60x – 75y = 210 5(-12x +15y = -42) = -60x + 75y = -210 60x – 75y = 210 + -60x + 75y = -210 = 0 The equations are not independent therefore they have an infinite ...
*April 25, 2009*

**Algebra**

with the first one was i suppose to multiply it by -3? i multiplied the first equiation by 15 and the second by -5. does it matter?
*April 25, 2009*

**Algebra**

what about this one? I'm having a tough time with this one as well... Solve by substitution or elimination method: -2x + 6y = 19 10x – 30y = -15
*April 25, 2009*

**Algebra**

Solve by substitution or elimination method: 4x – 5y = 14 -12x + 15y = -42 when i try this solution i end up cancelling out the whole problem. can someone please help me!
*April 25, 2009*

**Trigonometry**

A painter needs to cover a triangular region 62 meters by 68 meters by 70 meters. A can of paint covers 70 square meters. How many cans will be needed?
*April 24, 2009*

**math (ruler)**

I need help finding the mesurment in a ruler the little bitty mark could you pull up a ruler for me with all the marks .
*April 22, 2009*

**math**

would it be 30
*April 22, 2009*

**math**

round to the nearest ten dollars, then estimate the answer/ $73.88=---dollars +29.04----dollars ------------------ Total-----dollars
*April 22, 2009*

**math**

how would you create an equation for sec(2x) using both sec(x) and csc(x)? the steps i have so far are 1/(cos^2(x)-sin^2(x)) = 1/(1-1)/(sec^2(x)-csc^2(x)) but then i do not know what to do after this.
*April 19, 2009*

**math**

how would you determine a formula for cot(2x) using only cot(x)? Thenhow would you determine a formula for sec(2x) using only sec(x)?
*April 19, 2009*

**math**

when you are determining a formula for cot(2x) using only tan(x) would the formula be...(1-tan^2(x))/(2tan(x))?
*April 19, 2009*

**math**

when 2 lines intersect and form an acute angle A and both lines have a positive x-intercepts but the y-intercepts are on opposite sides of the origin. How would you write an equation showing the relationship between A and the angles that the normals make with the positive x-axis?
*April 18, 2009*

**Science**

If the density of ice is 0.92 g/cm^3, what percent of an ice cube’s (or iceberg’s) mass is above water.
*April 15, 2009*

**physical science**

An object in the shape of a cube has a mass of 375 grams and a side that measure 5.0 cm. Will this object float in water? Prove your answer by comparing the density of the cube to that of water.
*April 15, 2009*

**math**

if you have the triangle ABC with the points A(47,100) B(-1273,203) and C(971,-732) how would you find the center point and the radius of the incircle of triangle ABC?
*April 15, 2009*

**math**

if you have the triangle ABC with the points A(47,100) B(-1273,203) and C(971,-732) how would you find the center and the radius of the incircle of triangle ABC?
*April 13, 2009*

**sociology**

the gradual transition from monarchy topolitical democracy during the last half of the second millennium stimulated a corresponding transition from imperial rule by the power of the sword to imperial rule by the pwoer of money.
*April 13, 2009*

**math**

how would you factor (5(x+2)^4)+(3x(x+2)^3)-(2x(x+2)^2). I have so far gotten it down to 2(3x^4+25x^3+74x^2+92x+40) but i'm not sure that i am doing this right.
*April 5, 2009*

**Algebra**

Ella is twice Bella's age, and Stella is three times Bella's age. The difference between Stella's and Bella's ages is 8 yrs. How old is each girl?
*April 5, 2009*

**Algebra**

THANKS!
*April 3, 2009*

**Algebra**

So no 1 goes above that? as in 1 ------- 2^2*7^8?
*April 3, 2009*

**Algebra**

Simplify (2^-1∙7^-4)^-2 Is it 1/2^2*7^8 OR simply just 2^2*7^8
*April 3, 2009*

**Algebra**

Thanks for your help :)
*April 3, 2009*

**Algebra**

Is it the same thing? I don't know, but my first choice was A. I still do not understand how (p-4+m p2m)-4 / (p-4)-m = (p-4+3m)-4 / p4m = p^16-12m / p^4m where does the 12 fit in? and how does the answer end up as A? = p16-16m
*April 3, 2009*

**Algebra**

Ok but the answer is typed incorectly choice A is p^-16+16 not = p^16-16m
*April 3, 2009*

**Algebra**

Where did you get 3m from? The problem reads Simplify (p^-4+m p^2m)^-4 ---------------- (p^-4)^-m Theses are the choices A) p-16m + 16 B) p-8m – 4 C) p-11m – 4 D) p-3m + 16 I say its A or B
*April 3, 2009*

**Algebra**

Thank you for all your help! :)
*April 3, 2009*

**Algebra**

What about breaking the fractions a part like this? 5x -2 - 3y -1 = 5 - 3 ----------------- x -1 + y -1 ------- x^2 y --------------------- 1 + 1 ------------ x y = 5y+3x^2 * x^2 y -------- x+y x^2 y(5y+3x) = 5xy^2 + 3x^2 y
*April 3, 2009*

**math**

how would you find an equation to a line that is parallel and 3 units away from the line x-5y+10=0?
*April 3, 2009*

**science**

what are three fresh water resources and what are three ocean water resources?
*April 2, 2009*

**Environmental Science**

What are three fresh water resources and three ocean water resources
*April 2, 2009*

**Algebra**

Why would it be this because a*a is 2a? I thought at first it is a^2? Can you please explain, thanks!
*April 2, 2009*

**Algebra**

a*a = a^2? yes? No? Or is it (m + 4) (2a – 2)
*April 2, 2009*

**Algebra**

Factor (m + 4) (a – 5) + (m + 4) (a + 3) I am pretty sure its this but want to double check! Thanks! (m + 4) (a^2 – 2)
*April 2, 2009*

**Algebra**

There is no division necessary here? So the final answer is what is @ the bottom? (5x^-1)-3 (-2+1=-1, and -1+1=0)
*April 2, 2009*

**medical information management and office practice**

Explain the difference between qualitative and quantitative medical record analysis.
*March 31, 2009*

**math**

how would you prove that (cos^2x-sin^2x)(1-cos^2xsin^2x)= (cos^6-sin^6)?
*March 30, 2009*

**math/slope-intercept form**

2x+y=5
*March 28, 2009*

**Pre-Cal**

Perform the operation and write the result in standard form. (2-3i)(5i) over 2+3i Please help!! I do not understand this.
*March 25, 2009*

**Pre-Cal**

Perform the addition or subtraction and write the result in standard form. (8+sqrt -18) - (4+3sqrt2i) I know that you have to subtract 8 from 4 but I do not know what to do after this.
*March 25, 2009*

**7th grade reading**

I know this was already answered,but the child would be possessive if she does not share her toys. It is the synomem for "overprotective"
*March 24, 2009*

**3rd grade reading/spelling**

What does it mean to adjust and monitor reading speed?
*March 24, 2009*

**math**

from a base elevation of 8500 ft, a mountain peak in colorado rises to a summit elevation of 14595 ft over a horizontal distance of 15842 ft. find the grade of the peak.
*March 22, 2009*

**Physics**

As the distance between an object and the center of the Earth is increased 1)the object's mass decreases and its weight remains the same. 2)both the object's mass and its weight remain the same 3)both the object's mass and its weight decreases. 4)the object's ...
*March 19, 2009*

**grammar**

Suboridiante clauses: What is the subordinate clause in the sentence: May the dreams you dream today be tomorrow's dreams come true.
*March 19, 2009*

**Marine Science**

What happens to the majority of water at the poles and at the equator? My answer was that at the poles the water gets cold and at the equator the water gets hot but my teacher said this was wrong. Please help!
*March 18, 2009*

**ethics**

that president of mix race will save your dumb butt you probably voted for bush didnt you that why america is in the shape it is in now because of people like you get a clue
*March 16, 2009*

**ethics**

i dont understand what they mean when they said my i dont understand i got everything except the ast question.
*March 16, 2009*

**ethics**

I need help i just dont understand it can someone PLEASE help me!!!!!!!!!
*March 16, 2009*

**ethics**

Write a 200-300 word summary that answers the following questions: what information about race and ethnicity in the united states has helped you better understand or relate to specific minority groups?, Have you learned something new about your own cutural history?, trends in...
*March 16, 2009*

**statics**

16. The Roper Organization conducted identical surveys in 1990 and 2000. One question asked women was, “Are most men basically kind, gentle, and thoughtful?” The 1990 survey revealed that, of the 3,000 women surveyed, 2,010 said that they were. In 2000, 1,530 of the ...
*March 15, 2009*

**Physics**

Jessica's weight is 540 newtons. According to the Third Law, if the Earth pulls on Jessica with a force of 540 N, then Jessica pulls on the Earth with a force of 540 newtons that acts in the opposite direction. However, if Jessica stumbles while rollerblading, she will ...
*March 15, 2009*

**discrete math**

what is the link between matricies and graph theory
*March 14, 2009*

**Parametric curves and area**

1.The curve of x=49-t^2 and y=t^3-1*t makes a loop which lies along the x-axis. What is the total area inside the loop? 2.Find the area of the region enclosed by the parametric equation: x=t^3-7*t and y=4*t^2.
*March 10, 2009*

**Calculus-Modeling Equations**

An unknown radioactive element decays into non-radioactive substances. In 420 days the radioactivity of a sample decreases by 39 percent. 1.What is the half-life of the element? 2.How long will it take for a sample of 100 mg to decay to 46 mg?
*March 6, 2009*

**Chemistry**

How many moles of KMn)4 are required to reach with the moles of Na2C2O4 in the last problem? and also, if the KmnO4 of the last problem is in 30.30mL of solution what is the molarity (M) of the KmnO4 solution?
*March 3, 2009*

**Chemistry**

how many moles of Na2C2O4 are there in 25.00 mL of a .7654 M solution of sodium oxalate?
*March 3, 2009*

**Chemistry**

thank you. so what did you get as a final answer for this problem then? and what did u do after doing 2.2=2PHN3 and after subsituting the partial pressure?? Thanks
*March 2, 2009*

**Chemistry**

How do you solve this: Consider the decomposition of ammonium chloride at a cerain temperature NH4Cl(s) <- NH3(g) + HCl(g) -> Calculate the equilibrium constant Kp if the total pressure is 2.2 atm at that temperature.
*March 2, 2009*

**geometry**

how do you do linear measure and precision
*February 26, 2009*

**4th grade english**

Earlier this year, our class ______ a greenhouse. (visit) Would the correct form be has visited
*February 22, 2009*

**Accounting**

Hello, I am taking an accounting class and the questions states "post to the accounts and keep a running bakance for each account" the question gives a page number to refer to but it does not provide any guidance. What does these means?? Thanks
*February 22, 2009*

**Math**

Determine whether the function is one-to-one. If it is, find itd inverse. f(x)= 3x+4 over 5
*February 19, 2009*

**Math**

Use a graphing utility to approximate (to two-decimal-place accuracy) any relative minimum or maximum values of the function. y=x^3 - 6x^2 + 15 My answer was (4,12) for min and(0,-12) for max.
*February 18, 2009*

**Math**

5x-6(-5x + 2) = 16
*February 18, 2009*

**mechanics**

An object has a mass of 120 kg on the moon. What is the force of gravity acting on the object on the moon?
*February 5, 2009*