Monday

February 27, 2017
Total # Posts: 4,440

**bio**

Imagine you are purifying a protein which accounts for 0.001% of the total protein within a cell. How many steps of purification are required to yield pure protein, assuming a 10 fold purification with each step of purification?

*February 26, 2017*

**math**

1.The cost of a telephone call from Wilsonto East Meadow is $0,60 for the first three minutes plus $0.17 for each additional minute. What is the greatest number of whole minutes of a call if the cost cannot exceed $2.50? 2.When John bought his new computer, he purchased an ...

*February 26, 2017*

**Math**

Bart is saving to buy a flat screen monitor that costs $345. He has already saved $37. What is the least amount of money Bart a must save each week so that at the end of 11 weeks he has enough money to buy the monitor?

*February 26, 2017*

**Chemistry**

Determine the concentration for the following solutions 2.0g KOH is dissolved in water to make 200.0 ml of solution

*February 23, 2017*

**Math**

When a class took a math test, 15% of the class failed, 25% made some mistakes (but didn’t fail), and 24 students got perfect scores. How many students were in the class?

*February 23, 2017*

**Math**

One of the sides of a parallelogram is 4.2 cm and the altitude to that side is 3.6 cm. Find the perimeter of the parallelogram if the altitude to the other side is 2.4 cm.

*February 23, 2017*

**Math**

The area of a parallelogram with a side of 5.6 in is equal to the area of a rectangle with sides 7 in and 8 in. Find the altitude to the given side in the parallelogram.

*February 23, 2017*

**biology**

A bacterium has a genome size of 6.0 X 106 base pairs. There is one Origin of Replication (ORI) and each DNA polymerase catalyzes the addition of 1,000 nucleotides/second. How much time is needed to replicate the entire genome?

*February 20, 2017*

**Molarity question!! please help urgently!**

Suppose you wanted to produce an aqueous solution of pH = 8.70 by dissolving one of the following salts in water: NH4Cl, KHSO4, KNO2, NaNO3. Use salt KNO2. But at what molarity? Please help!! Thank you!

*February 17, 2017*

**Equilibrium concentrations, please help!!!**

Lead metal is added to 0.150 M Cr3+(aq). Pb(s)+2Cr3+(aq)?Pb2+(aq)+2Cr2+(aq). KC=3.2×10?10 What is [Pb2+] when equilibrium is established in the reaction? What is [Cr2+] when equilibrium is established in the reaction? What is [Cr3+] when equilibrium is established in the...

*February 17, 2017*

**science, chemistry**

Lead metal is added to 0.150 M Cr3+(aq). Pb(s)+2Cr3+(aq)?Pb2+(aq)+2Cr2+(aq). KC=3.2×10?10 What is [Pb2+] when equilibrium is established in the reaction? What is [Cr2+] when equilibrium is established in the reaction? What is [Cr3+] when equilibrium is established in the...

*February 17, 2017*

**Math**

The total cost of producting x radio sets per day is (1/4x^2 + 35x + 25) dollars. The price per set at which they may be sold is ( 50 -1/2x) dollars. What should be the daily output be to obtain the maximum profit? Help!!!

*February 9, 2017*

**Algerbra**

Thank you!

*February 8, 2017*

**Algerbra**

Please help! Find the vertex of f(x)=x^2+2x-3 Find the vertex of f(x)=x^2-3x+1

*February 8, 2017*

**English**

Thanks Mr.Bob

*February 8, 2017*

**English**

Which option best describes a main idea of "Kuba Khan" Society tends to fear creative people Creative people are welcome in society Society tends to love creative people< Hail is a problem in many societies

*February 8, 2017*

**Sara**

I'm reading different... maybe it's C

*February 8, 2017*

**English (sorry)**

I think it's B.

*February 8, 2017*

**Math**

Determine a,b and c so that curve y= ax^3 + bx^2 + cx will have a slope of 4 at its point of inflection (-1,-5) Help please!

*February 8, 2017*

**Math**

Determine a,b and c so that curve y= ax^3 + bx^2 + cx will have a slope of 4 at its point of inflection (-1,-5) Help please!

*February 8, 2017*

**Math**

Determine a,b and c so that curve y= ax^3 + bx^2 + cx will have a slope of 4 at its point of inflection (-1,-5) Help please!

*February 8, 2017*

**Math**

Fine the max or min points and the points of inflection for the function y=3x^4 - 10x^3 - 12x^2 + 12x - 7 Can someone help me!!!

*February 7, 2017*

**Math**

Find the critical points, and the points of inflection y= (x+1)^2/x Help me please!!!

*February 6, 2017*

**Algebra **

what are the coordinates of the vertex of f(x)=-x^2+6x-9 (0,-9) (3,-9) (3,0) (6,0) How do I figure this out?

*February 6, 2017*

**ELA**

A just took the quiz it is 1. A 2. C 3. B 4. D 5. C I hope this helps!

*January 31, 2017*

**Math (Elementary Linear Algebra)**

Find the general flow pattern of the network. 20<---A |\B__>x(4) |/ 80<---C I believe the system of equations for A,B,&C is-A: x(1)+x(3)=20 B: x(2)=x(3)+x(4) C: 0=x(1)+x(2) Assuming flows are all nonnegative, what is the largest possible value for x(3). Sorry, this ...

*January 31, 2017*

**Math**

I set up the equation like you said 11+.21m =20+.10m -.10m. -.10m 11+ .11m =20 -11. -11 .11m/.11=. 9/.11 This doesn't seem correct

*January 18, 2017*

**Math**

Verizon has two different cell phone plans. The cost, Y, of plan A is $11 a month Plus $.21 per minute. The cost, Y, of Plan B is $20 a month plus $.10 per minute. After how much time to the nearest minute will the cost of plan a B equal to the cost of Plan B? Can you help me ...

*January 18, 2017*

**PE**

Which is correct?

*January 18, 2017*

**PE**

I took the test and Dairy is correct, if you look at my plate it says the same :)

*January 18, 2017*

**math**

For what values of r does the function y = erx satisfy the differential equation y'' ? 6y' + 3y = 0?

*January 12, 2017*

**Math discussion**

yea thanks Katie you are really a big help! i just did my discussion and pass it! Katie you are the best. Again thank so much!

*January 5, 2017*

**Percentage**

A flat-screen TV costs $1,400. The TV is on sale for 35% off. What's the discount price?

*January 4, 2017*

**Presentation**

Why is coffee bean good

*December 25, 2016*

**math**

thank you for your help

*December 21, 2016*

**math**

Justin has an I-tunes gift card worth $125. after he downloads his first app, the cards value is $118.01. after he downloads his second app, the cards value is $111.02. after he downloads his third app, the i-tunes gift card is worth $104.03. Justin wants to download as many ...

*December 21, 2016*

**elementary school**

what do I do when there is an equation like 15/4 divided by 9/1 how do I do that since 9 cant go into 15 evenly

*December 21, 2016*

**math**

THERE ARE ESTIMATES OF THE MARGIN OF ERROR FOR CONFIDENCE LEVELS OTHER THAN 95%. FOR A 90% CONFIDENCE LEVEL AND A SAMPLE SIZE N, THE MARGIN OF ERROR IS APPROXIMATELY 82/N%.SUPPOSE WE WISH TO HAVE A MARGIN OF ERROR OF 1% WITH A 90% CONFIDENCE LEVEL. APPROXIMATELY HOW MANY ...

*December 19, 2016*

**MATH**

What percentage of adult males in America are under 5 feet 7 inches tall?

*December 19, 2016*

**Health**

From beans! They are a pure protein. So C would be your correct answer.

*December 14, 2016*

**math**

Drawing 5 cards out of 13 cards numbered 1 to 13 without replacement, what is the probability of having a sum greater than 40 ?

*December 11, 2016*

**Physics**

consider the circuit in the figure. find the current in the 13 ohm resistor. Answer in units of A

*December 7, 2016*

**english**

Can someone help me write a 8 line poem about Romeo and Juliet

*December 6, 2016*

**math**

Compare -8 ? 10. Use <, >, or =.

*December 5, 2016*

**Stats**

A dean wishes to estimate the average cost of the freshman year at a particular college correct to within $500, with a probability of 0.95. If a random sample of freshmen is to be selected and each asked to keep financial data, how many must be included in the sample? Assume ...

*December 5, 2016*

**Math**

Jessica has been given a list of 4 bands and asked to place a vote. Her vote must have the names of her favorite and second favorite bands from the list. How many different votes are possible?

*December 4, 2016*

**Math**

Two parallel lines are cut by a transversal Suppose m?438° Find m?6 and m?7 * m?6 and m?7 are corresponding angles *

*December 4, 2016*

**History**

What did the Edict of Nantes do for their culture?

*December 4, 2016*

**History**

Thank you :)

*December 4, 2016*

**History**

What did the Edict of Nantes do for the Economy?

*December 4, 2016*

**Maths**

A number consists of two digits.THe digit in tens place is twice that in units place.if 18 is subtracted from the number. The digits are reversed.find the number.

*December 4, 2016*

**Maths**

divide 1000 among a,b,c in such a way that a gets 120 more than b and b gets rs 110 more than c .hw much each get

*December 4, 2016*

**Maths**

50 divided into two parts such that if 6 is subtracted from one part , 12 is added to the second part we get same number .

*December 2, 2016*

**math**

The radioactive decay of a substance is expressed by A=A^0 e^ -kt, where the initial amount A^0, decays to an amount A after t years. The positive constant k differs for each substance. Strontium 90 decays such that k=.028. Find out how much of 1,000 mg of strontium 90 remains...

*December 1, 2016*

**chemistry**

why is the spectrum of hydrogen composed of discrete lines?

*November 29, 2016*

**Math**

The figure below shows two triangles. Which statement about the triangles is true? i.imgsafe(.)org/c60dcd0488(.)jpg The triangles can be proven congruent by: 1. Angle angle side <<< 2. Angle side angle 3. Side angle side 4. The triangles cannot be proven congruent

*November 28, 2016*

**Algebra**

Chandra has 2 liters of a 14% solution of sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 7 liters of a 34% solution?

*November 28, 2016*

**algebra**

Shari drove for 90 miles in the city. When she got on the highway, she increased her speed by 20 mph and drove for 130 miles. If Shari drove a total of 4 hours, how fast did she drive in the city?

*November 27, 2016*

**algebra**

Bob needs to wash the windows on his house. He has a 25-foot ladder and places the base of the ladder 10 feet from the wall on the house. How far up the wall will the ladder reach?

*November 27, 2016*

**math**

Solve the quadratic equation, 2 x2 - 5 x+3

*November 27, 2016*

**Math (please check my answer!!)**

What other information is needed to prove that the two triangles congruent by SAS? Picture description: there are two triangles showing line LT = line MQ and L=M A. <T = <Q B. <G = <N C. Line GT = line NQ << D. Line LG = line MN

*November 22, 2016*

**Biology (please help!!)**

Explain the process that takes place in the stroma including and reactants going in nd the products produced from these processes in a. bright sunlight and in b. darkness. c. what happens over an extended period of darkness of many days? What I need to know is part C.. I have ...

*November 21, 2016*

**math**

Can you please help with finding rate of change in graphing? One question has times: 0 15 23 30 35 distance:30 70 0 45 60 Can you help me get started, I don't know what to do? Also, in another question for the slope I have to find which line has greatest absolute value ? ...

*November 20, 2016*

**Government**

What is the role of joint chiefs of staff? A.To serve as objective military advisors B.To manage the executive office of the president << C.To lead the department of Defense << D.To lead the state Department I'm not sure if it's B or C, I do lean more ...

*November 18, 2016*

**math**

Estimating the product of a decimal and a whole number what is 8.02 x 70

*November 17, 2016*

**math**

What is the estimated answer of 0.97x312

*November 17, 2016*

**Physics**

Suppose your car was mired deeply in the mud and you wanted to use the method illustrated in the figure to pull it out. (a) What force in newtons would you have to exert perpendicular to the center of a rope to produce a force of 10,000 N on the car if the angle is 1.80°? ...

*November 7, 2016*

**MATH**

If y varies inversely with x and y = 8 when x = 5, then what is y when x = 2? 4 6 10 20

*November 5, 2016*

**Math**

A store buys shirts for $12 each and marks up the price by 25%. What is the price for a shirt at this store?

*November 1, 2016*

**Math**

V varies inversely with T and V = 12 when T = 6. Which equation shows this relationship? V = 2T V = 72T--- My Answer v=2/T V=72/T

*October 27, 2016*

**Algebra**

f(x) varies inversely with x and f(x) = –10 when x = 20. What is the inverse variation equation?

*October 27, 2016*

**math**

12.75 x 8.25

*October 24, 2016*

**Math**

Which equation(s) represents a proportional relationship? A) y = 5 + x B) y = 4x C) y = 7x² D) y = 2 - x

*October 21, 2016*

**Math**

What integer represent a debt of 12$

*October 20, 2016*

**MATH**

Suppose an object moves along the x-axis so that its position at time $t$ is $x=-t+\frac{t^3}{6}$. (a) Find the velocity, $v(t)=x(t)$, of the object. (b) What is $v(0)$? What does this say about the direction of motion of the object at time $t=0$? (c) When is the object at the...

*October 20, 2016*

**math**

The formula of a trapezoid is A=1/2h(b1+b2) Express b1 in terms of A,h,and b2 I did A=1/2hb1+1/2hb2 A=hb1/2 +hb2/2 A-hb2(2/h)=hb1/2(2/h) A-b2=b1 I am not sure if this is correct? I was confused on how to do this. Any help or explanation is greatly appreciated. Thank you.

*October 4, 2016*

**History**

I was wondering how I use citation for a website?

*October 4, 2016*

**English**

1. Choose the answer that best matches the word in italics. Samantha tried to look IMPASSIVE when they announced her essay as a finalist in the competition. (1 point) surprised unemotional*** unsure vibrant 2. Choose the answer that best matches the word...

*September 29, 2016*

**science**

its A

*September 29, 2016*

**Physics**

Pls send the answers

*September 29, 2016*

**Civics**

I need an example of two Statute laws. I know what it means but I don't know any laws.

*September 28, 2016*

**polynomials**

Thank you for explaining my mistake.

*September 25, 2016*

**polynomials**

I have to simplify (-x^5y^4)^4(3x^2y)^2(1/3xy) I did (x^20y^16)(9x^4y^2)(1/3xy) (9x^24y^18)(1/3xy) 3x^25y^19 Is this correct? Thank you for your help!

*September 25, 2016*

**algebra**

5/x-3/4x=23/x+6 first I made it 20/4x-3/4x=23/x+6 Then I am stuck how to solve the rest of the equation Can you please help. Thank you

*September 21, 2016*

**Math**

Carly and Kyle decided to count the number of red, blue, and yellow cars that they saw. They counted twice as many red cars as blue cars. The number of yellow cars they counted was one third of the number of red cars if they counted a tote of 33 cars. How many of each car did ...

*September 19, 2016*

**Social studies**

1. Clock maker gun maker and wheat maker 2. B 3. B and c

*September 14, 2016*

**Math**

2√2 (3√8 - √6) For my answer I got 24 - 2√12, would this be correct? I'm not sure if I simplified incorrectly.

*September 13, 2016*

**Chemistry**

I actually found the answer. The answer is 83 grams. You must convert the values accordingly. oz to grams, Fahrenheit to Celsius. You calculate the heat lost by the drink first. This is the setup: =(368.544g)(4.18J/gC)(-17.7778C) the change in temp is found by first converting...

*September 13, 2016*

**Chemistry**

When ice melts, it absorbs 0.33 kJ per gram. How much ice is required to cool a 13.0 oz drink from 71 ∘F to 39 ∘F, if the heat capacity of the drink is 4.18 J/g∘C? (Assume that the heat transfer is 100 % efficient.)

*September 13, 2016*

**Physics**

Ho can I calculate the volume of a CD that is 0.75 mm thick has outer diameter of 128 mm and inner diameter of 15 mm.

*September 4, 2016*

**College Algebra**

At a basketball game a vendor sold a combined total of 196 sodas and hotdogs. The number of sodas was 48 more than the number of hotdogs sold

*September 1, 2016*

**chemistry**

A solution is made by mixing 25 mL of .35 M LiOH with 15.5 mL of .2225 M NH3. Kb=1.8x10^-5 for NH3 Calculate the pH for the solution.

*August 25, 2016*

**American government**

ey it was CDDC

*August 23, 2016*

**perfect number**

I need please!!!!

*August 16, 2016*

**perfect number**

Yes i need soon for my activity

*August 16, 2016*

**perfect number**

I need two perfect numbers. For my activity,I should submit it tomorrow please help me. I need now. Please

*August 16, 2016*

**Maths**

An industrial fertilizer costing $370 per tonne to produce is sold retail 61 cents per kilogram.If there is a wastage of 2.5%,find the profit as a percentage of the cost?

*June 29, 2016*

**Abnormal Psychology**

GAD

*June 27, 2016*

**Math**

Sara was mixing punch for a party from a recipe that calls for 3 parts ginger ale mixed with 2 parts pineapple juice. She graphed the people served compared to the total mixture. Use the point shown on her graph to compute the ginger ale need to serve 20 people.

*June 24, 2016*

**math**

if you make guesses for four multiple-choice test questions (each with five possible answers), what is the probability of getting at least one correct?

*June 23, 2016*