# Posts by Lisa

Total # Posts: 3,414

**math**

Thank you c:

*February 20, 2013*

**math**

oh because i thought it was a negative and a positive so they cancel out but its 7x^2-6x-6? or...?

*February 20, 2013*

**math**

so would it be 7x^2-6??

*February 20, 2013*

**math**

what is the sum of (x^2-3x+2) and (5x^2-3x-8)? how would you solve this???? please help

*February 20, 2013*

**Chemistry**

Thank you

*February 20, 2013*

**Chemistry**

A thoroughly dried 1.281g sample of Na2SO4 is exposed to the atmosphere and found to gain 0.383g in mass. What is the percent, by mass, of Na2SO4*10 H2O in the resulting mixture of anhydrous Na2SO4 and the decahydrate

*February 20, 2013*

**Pre Cal**

Sec^2 2u-1/Sec^2 2u = Sin^2 2u

*February 19, 2013*

**MaTH**

the perpendicular line is -2 the parallel line is 3/2

*February 18, 2013*

**Chemistry**

A 62g piece of ice at 0 degrees celcius is added to a sample of water at 9 degrees celcius. All of the ice melts and the temperature of the water decreases to 0 degrees celcius. How many grams of water were in the sample

*February 17, 2013*

**English**

Are there cultures that should not be promoted in the early childhood education setting? Why or why not? Support your position.

*February 16, 2013*

**algebra**

Can you please help me with this problem? -7x-4x-5=9x

*February 14, 2013*

**math**

if the ratio of boys to girls is 3/4 and there are 49 students how many boys are there?

*February 14, 2013*

**Reading**

ok thanks

*February 13, 2013*

**Reading**

Is the correct answers 4. empathy 6. complacent 9. diligent 10. transcend

*February 13, 2013*

**Reading**

Is this the correct word for each sentence 1-2. Lynn begged the bank to __ the overdraft charge of thirty dollars, telling them that it would entirely __ her savings. 3-4. In high school, Julio was voted "Most Likely to Become a Psychologist." It was the __ of his ...

*February 13, 2013*

**Chem Help!!!!!**

Ha! I just saw your comment... I am indeed are you in his class or you've taken him before, Donovan?

*February 11, 2013*

**Chem Help!!!!!**

The angle iron pictured here is made of steel with a density of 7.78g/cm^3. (Figure 1) measurements are: 12.78cm 10.26cm 1.35cm 2.75cm 1.35cm

*February 11, 2013*

**College Physics 2**

A parallel-plate air capacitor is made from two plates 0.250 m square, spaced 0.70 cm apart. It is connected to a 140 V battery. a) What is the capacitance? C = 7.90×10−11 F b) What is the charge on each plate? Enter your answer as an absolute value of charge. Q = ...

*February 11, 2013*

**accounting**

Suppose that two years after the bonds were issued, the required interest rate fell to 7 percent. What would be the bonds’ value?

*February 11, 2013*

**business**

In portfolio analysis, the goal when purchasing leverage items is

*February 10, 2013*

**algebra**

8/3fg^2

*February 10, 2013*

**Chemistry**

I read this question wrong and posted it wrong...it should be which is incorrect? If this is the case shouldn't C be the correct one?

*February 10, 2013*

**Chemistry**

Consider the following equilibrium: NH4Cl(s)--->NH3(g) + HCl(g) Suppose a vessel containing NH4Cl(s), NH3(g) and HCl(g) is at equilibrium. If the volume of vessel is instantaneously doubled while keeping the temp constant when a new equilibrium is reacted, which of the ...

*February 10, 2013*

**Math**

x+ .76x =1.76x Or 1x+.76x=1.76x

*February 10, 2013*

**Math**

.76(.0200-x)=x .0152-.76x=x +.76x +.76x (x add to .76x = 1.76x) .0152=1.76x (divide by 1.76 to solve for x)

*February 10, 2013*

**math**

6x=-36 /6 /6 x =-6

*February 9, 2013*

**CHEM**

How many grams of magnesium chloride are needed to prepare 100ml of a 0.325 M MgCl2 solution?

*February 7, 2013*

**CHEM**

What is the molarity of potassium iodide solution prepared by adding 5.810g of KI to sufficient water to make a final solution volume of 250.0mL?

*February 7, 2013*

**CHEM**

What is the molarity of a calcium sulfate solution prepared by adding 27.89g of CaSo4 to sufficient water to make a final solution volume of 1.00L?

*February 7, 2013*

**CHEM**

How many grams of sodium chloride are required to prepare 1.00 liter of a 1.00M NaCl solution?

*February 7, 2013*

**math**

9*12=108 W+(w+44)=108 2w=64 W=32. -white roses

*February 7, 2013*

**math**

X+y=54 5x+20y=780 -5(x+y=54) -5x-5y=-270 5x+20y=780 15y=510 Y=34 X=20 5(20)+20(34)=780 Five dollars bills = 20

*February 7, 2013*

**Algebra 1- Math**

2x-3y =-3 -1(3x-3y=18) 2x-3y=-3 + -3x+3y=-18 (add two equations) -x = -21 x = 21 2(21)-3y =-3 42-3y=-3 -3y=-45 y=15

*February 7, 2013*

**math**

A man sells a nut mixture consisting of 1/3 pecans and 2/3 cashews. Pecans cost 3 times as much as cashews. if a pund of the mixture costs him $0.40, how much did he pay for a pond of cashews? a pound of pecans?

*February 7, 2013*

**Physics**

In a baseball a pitcher can accelerate a .15kg ball from rest to 98 mi/h in a distance of 1.7m a) what is the average force exerted on a ball during a pitch? b)If the mass of the ball is increased, is the force required of the pitcher increased, decreased or unchanged?

*February 7, 2013*

**MATH**

7s-5s+10<30 -10 -10 7s-5s < 20 2s < 20 \2. \2 S. < 10

*February 6, 2013*

**Math**

Tom spent 1/3 of his allowance at mall. Of the money he spent at the mall, he spent 3/5 of it on jeans. What fractions of his allowance did Tom spend on jeans?

*February 6, 2013*

**Algebra**

W(w+4)=77 W^2 + 4w - 77 = 0 (W-7)(w+11)=0 W-7=0 W=7 W+11=0 gives neg. ans. Length = 7+4=11 Width = 4

*February 6, 2013*

**physics**

a mass m=8 kg sits on top of an h=1.8 m high table. The angle of the ramp is theta= 35 degrees. What is the length of the ramp.

*February 5, 2013*

**Reading( Immediate)**

Thanks

*February 4, 2013*

**Reading( Immediate)**

Do you have a copy of the sentence check 2 questions for chapter 20 in the 4th edition of Improving Vocabulary Skill book by Sherrie L. Nist?

*February 4, 2013*

**CHem Help!!!!**

What Celsius temperature will the Fahrenheit thermometer be 4-times more than on the Celsius thermometer?

*February 4, 2013*

**Chem Help!!!!**

I just need a solution to the first half of the question I figured out the 2nd half

*February 4, 2013*

**Chem Help!!!!**

What Celsius temperature will the Fahrenheit thermometer be 4-times more than on the Celsius thermometer? At what Celsius temperature will the numerical reading on the Fahrenheit thermometer be 1/9 that on the Celsius thermometer?

*February 4, 2013*

**Chem Help!!**

thank you

*February 2, 2013*

**Chem Help!!**

A standard 1.000kg- mass is to be cut from a bar of steel having an equilateral triangular cross section with sides equal to 3.00in. The density of the steel is 7.70g/cm^3. How many inches long must the section of bar be?

*February 2, 2013*

**Chem Help!!**

ok cool thanks for your help

*February 2, 2013*

**Chem Help!!**

After I multiplied by 2 I got a final answer of 0.000556mm

*February 2, 2013*

**Chem Help!!**

When I converted with Devron method I got 27.8*10^-6mm When I did it Bob's way I got 27.8*10^-5 is this correct?

*February 2, 2013*

**Chem Help!!**

The volume of a red blood cell is about 90.0*10^-12cm^3 Assuming that the red blood cells are spherical, what is the diameter of a red blood cell in millimeters?

*February 2, 2013*

**Chemistry**

thank you

*February 2, 2013*

**Chemistry**

20.02cm*

*February 2, 2013*

**Chemistry**

The density of aluminum is 2.70 g/cm^3. A square piece of aluminum foil, 20.02 on a side is found to weigh 2.573g. What is the thickness of the foil, in millimeters?

*February 2, 2013*

**Chemistry**

when I was copying and pasting the problem the units and numbers did not transfer... I completely understand that you need these units

*February 2, 2013*

**Chemistry**

The density of aluminum is . A square piece of aluminum foil, 20.02 on a side is found to weigh 2.573 .What is the thickness of the foil, in millimeters?

*February 2, 2013*

**Chemistry**

1.006 g/ml 4.7% acetic acid by mass 3.00L

*February 2, 2013*

**Chemistry**

A vinegar sample is found to have a density of 1.006 and to contain 4.7 acetic acid by mass.How many grams of acetic acid are present in 3.00 of this vinegar?

*February 2, 2013*

**Chemistry**

Hey I tried that and still cant get the right answer. The answer that I got is 555.6 or 556 K and its not correct. What answer did you get?

*January 31, 2013*

**Chemistry**

At what temperature will the rate constant for the reaction have the value 6.5×10−3 M/s? (Assume k = 5.4 * 10^-4 M/s-1 at 599K and k = 2.8 * 10^-2 M/s at 683K .)

*January 31, 2013*

**Chemistry**

I am trying to determine which protein (in a given list) will stick most tightly to a cation exchange column at pH 7. I am unsure how to go about solving this.. We are given molecular weight, isoelectic point, and number of subunits for each protein. Where should I begin?

*January 31, 2013*

**Chemistry**

I am trying to determine which protein (in a given list) will stick most tightly to a cation exchange column at pH 7. I am unsure how to go about solving this.. We are given molecular weight, isoelectic point, and number of subunits for each protein. Where should I begin?

*January 31, 2013*

**goven**

Which one of the following is NOT widely regarded as a political ideal in America?

*January 29, 2013*

**Intermediate reading**

In questions 3 and 4 would the correct answer be: 3 prone , flippant 4. perception, impasse

*January 27, 2013*

**Intermediate reading**

Is question 3 and 4 correct

*January 27, 2013*

**Intermediate reading**

3.impasse, flippant 4. prone, perception

*January 27, 2013*

**Intermediate reading**

word choices: congenial, prone, flippant,rapport, impasse, rationale, perception, relentless, prompt, reprisal 1.Because Wade is so congenial and easy to talk to, we established a warm rapport the first day we met. 2. Although the company president explained rationale behind ...

*January 27, 2013*

**Intermediate reading**

Can you help me with the sentence check 2 Chapter 17 and 18 in the improving vocabulary skill workbook?

*January 27, 2013*

**math**

you fill up 40 gallon pool putting in 2 gallons water every minute, if someone scoops out 1 gallon every 8 minutes, how long would it take to fill the pool?

*January 24, 2013*

**science**

When you hit a nail into a board using a hammer, the head of the nail gets warm. In terms of kietic and thermal energy, describe why you think this happens.

*January 23, 2013*

**calculus**

Let f(x)=(2+x)2−4x. Note that f(x) is undefined at x=0. However, in this case, we can find a continuous function g(x) defined at x=0 that agrees with f(x) near x=0. Find the function g(x) that is equal to f(x) when x≠0 such that g(0)=limx→0f(x).

*January 19, 2013*

**calculus**

Let f(x)=x2+x−6x−2. Note that f(x) is undefined at x=2. However, in this case, we can find a continuous function g(x) defined at x=2 that agrees with f(x) near x=2. Find the function g(x) that is equal to f(x) when x≠2 such that g(2)=limx→2f(x).

*January 19, 2013*

**math**

A pattern for curtains calls for 2/3 of a yard of material. You want to shorten the curtains to2/3 of the height of the pattern. How much fabric is needed?

*January 18, 2013*

**Calculus**

Use a trig identity to combine two functions into one so you can solve for x. (The solution should be valid for any value of t). 3cos(t) + 3*sqrt(3)*sin(t)=6cos(t-x) I know that 6 cos(t-x) can be 6(cos(t)cosx(x)+sin(t)sin(x)) I don't know where to go from there though.

*January 15, 2013*

**Calculus**

In these complex exponential problems, solve for x: 1)e^(i*pi) + 2e^(i*pi/4)=? 2)3+3=3i*sqrt(3)=xe^(i*pi/3) MY attempt: I'm not really sure of what they are asking. For the 1st one I used the e^ix=cos(x)+i*sin(x) and got -1+sqrt(2) +sqrt(2)i 2) I solved for x and fot (3+3i...

*January 15, 2013*

**chemistry**

okay thank you very much :)

*January 14, 2013*

**chemistry**

thanks for the help i really appreciate it :D

*January 14, 2013*

**chemistry**

i know how to grapgh it and all i am only stuck with how to find the intial molar concentration. i believe you're telling me the step to finding the ka value. sorry i am a little confused with this

*January 14, 2013*

**chemistry**

the data is Vol. of NaOH added 0 1 2 3 4 5 10 15 20 21 22 23 24 25 26 27 28 29 30 35 40 45 50 pH 2.92 3.47 3.79 3.98 4.13 4.25 4.67 5.03 5.57 5.72 5.91 6.23 8.78 11.29 11.59 11.75 11.87 11.96 12.22 12.36 12.46 12.52 this is the data and this was given

*January 14, 2013*

**chemistry**

so this is the question: you will be given a sample of nictinic acid with an unknown concentration, and it will be titrated with 0.100M NaOH. instead of measuring the volume of the basic solution required to reach the endpoint, however, you will measure the pH. Then you will ...

*January 14, 2013*

**chemistry**

the chemical equation of nicotinic acid is C5H4NCOOH + NaOH --> C5H4NCOONa + H2O i need to calculate the intial molar concentration of this acid, based on the ratio in which the acid and base react. Please help i cant figure it out,

*January 14, 2013*

**Physics**

Stand two plane mirrors on their edges and parallel to one another. Place a coin between them near one end. How many images do you see? Draw a ray diagram to explain the formation of the images.

*January 13, 2013*

**Physics**

Stand two plane mirrors on their edges and parallel to one another. Place a coin between them near one end. How many images do you see? Draw a ray diagram to explain the formation of the images.

*January 13, 2013*

**Chemistry**

What is the mass of water that can be heated from 39 C to 80 C by the combustion of 150 g of methane. CH4 + 2O2 => CO2 + 2H2O Delta H= -890kJ

*January 11, 2013*

**Chemistry**

a)vii b)i

*January 11, 2013*

**Math**

Answer is 9

*January 11, 2013*

**algebra 2**

help please!! state the possible rational zeros for each function. then find all zeros. y=x^3-13x^2-x+13 show all the step please .thanks

*January 9, 2013*

**English**

Which sentance shows the verb in correct agreement with the subject? I have narrowed it down to these two sentences: A. Peggy or Phyllis drive me to Florida every winter. B. Not only the muffler but also the spark plugs need to be replaced. I want to go with A, but B also ...

*January 9, 2013*

**Science**

What things in the environment where I live in Hollister, CA determine the local ecosystem?

*January 8, 2013*

**algebra**

Is this mrs.. Berry

*January 8, 2013*

**grammar**

Which of the following contains a correct, standard use of a comma

*January 5, 2013*

**calculus**

Find the midpoint of the line segment joining the points P1 and P2 P1=(-1,5); P2=(2,0) m=(x,y)=? type an ordered pair Please show work

*January 1, 2013*

**calculus**

Find the distance d(P1,P2)between the points P1 and P2. P1=(-5,2) P2=(2,1) d(P1,P2)=? *all the 1's and 2's are to be lower down.* Please show work

*January 1, 2013*

**math**

the width of a rectangular garden is 2 m less than its length. Determine the dimensions of the garden if the area is 36 m2. thanks!

*December 30, 2012*

**CHEMISTRY**

(c) What is the value of the degree of polymerization n of isotactic PB with a molecular weight of 3.091×105 g/mol?

*December 29, 2012*

**pre algebra**

a typist works from 10am to 6pm making $120 for the day. after typing from the end of page 8 to the end of page 50, find the number of pages per hour. find the rate of pay in dollars per page

*December 28, 2012*

**math**

Solve 4a2 + 25 = –20a by factoring. Verify your solution Solve and verify the following equation: 13x2 + 35x + 21 = –12x2 – 25x – 15

*December 28, 2012*

**math**

One bag contains 6 red chips and 5 yellow chips. Another bag contains 6 red chips and 4 yellow chips. A chip is drawn from each bag. What is the probability that both chips are yellow?

*December 26, 2012*

**ASAP help CHEMISTRY**

I am completely lost on partial pressure. Please work it out for me so i can see the step by step. THANKS!

*December 19, 2012*

**ASAP help CHEMISTRY**

A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane in the mixture is 334 mmHg and the partial pressure of the oxygen is 1.02 atm, what is the total pressure of the mixture in torr?

*December 19, 2012*