# Robin

Popular questions and responses by Robin-
## chemistry

The vapor pressure of water @ 80 degrees C is 0.467 atm. Find value of Kc for the reaction H2O(l) to H2O(g) @ this temp.

*asked on October 9, 2011* -
## Chemistry

Explain why the solubility of PbF2 is pH dependent, but the solubility of PbCl2 is not. I know the solubility of PbF2 is pH dependent because the solubility would increase as the solution becomes more acidic because the F^- ion is the conjugate weak base

*asked on April 11, 2016* -
## Physics

Some insects can walk below a thin rod (such as a twig) by hanging from it. Suppose that such an insect has mass m and hangs from a horizontal rod as shown in the figure, with angle θ = 37°. Its six legs are all under the same tension, and the leg

*asked on February 17, 2014* -
## Statistics

A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. Assuming a standard deviation of 3 hours, what is the required sample size if the error should be

*asked on September 5, 2010* -
## Algebra

Form a third degree polynomial function with real coefficients such that -7 + i and -9 are zeros

*asked on March 21, 2016* -
## math

how to find slope and graph y+3=1/2(x+2)

*asked on July 23, 2020* -
## Calculus

A rancher wants to make a rectangular pen to house her animals. She will divide it up with 3 fences down the middle parallel to one side. If she has 14000 ft of fencing to work with, what are the dimensions of the pen of greatest area? Width = Length =

*asked on July 13, 2013* -
## math

write the phrase as an expression... 7 more than the quotient of a number y and 5

*asked on October 24, 2017* -
## Calculus

Gravel is being dumped from a conveyor belt at a rate of 10 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always equal. How fast is the height of the pile increasing when the pile is 16 feet

*asked on July 5, 2013* -
## math

-2I3mI+3

*asked on July 13, 2020* -
## Physics

A roller coaster has a mass of 425 kg. It sits at the top of a hill with height 66 m. If it drops from this hill, how fast is it going when it reaches the bottom? (Assume there is no air resistance or friction.)

*asked on May 14, 2013* -
## College Algrebra

Joel can run around a 1/4 mi track in 66 sec. Jason can run around the track in 60 sec.If the runners start at the same point on the track and run in opposite directions, how long will it take the runners to cover 1/4 mile?

*asked on January 25, 2016* -
## Chemistry!! Please help!

If the wavelength of line B is 142.5 nm, calculate the wavelength of line A. Line A is the transition of n=6 to n=3 Line B is the transition of n=5 to n=3

*asked on October 21, 2008* -
## math

a color printer prints 28 pages in 12 minutes. How many pages does it print per minute

*asked on December 3, 2018* -
## Calculus

A cable hangs between two poles of equal height and 40 feet apart. At a point on the ground directly under the cable and x feet from the point on the ground halfway between the poles the height of the cable in feet is h(x)=10+(0.4)(x^1.5). The cable weighs

*asked on October 19, 2013* -
## Calculus

Find the point on the line 7x+5y−2=0 which is closest to the point (−6,−2).

*asked on July 13, 2013* -
## math

R. H. Bruskin Associates Market Research found that 30% of Americans do not think that having a college education is important to succeed in the business world. If a random sample of five Americans is s selected, find these probabilities. (a) Exactly two

*asked on June 20, 2013* -
## Geology

There is also a graph i can't move it. Building Isochrons and Determining the Ages of Three Rocks Page 15 of 17 For each of the three rocks listed below follow these steps to determine the rock's age of formation. 1. Prepare an isochron by plotting the

*asked on January 12, 2013* -
## math

Matthew used 1/5 of a box of flour for cooking and 3/4 of the remainder to make bread. The rest of the flour was packed equally into 5 containers. What fraction of the total amount of flour was in each container?

*asked on March 7, 2018* -
## English 2

Water that aids digestion is really true.Identify the function of the noun clause.

*asked on February 4, 2015* -
## math

A gallon jug of milk is 3/4 full. After breakfast the jug is 1/12 full. Find the difference of the amounts before breakfast and after breakfast.

*asked on October 22, 2018* -
## math

you spend $16 on 3 notebooks and x binders. Notebooks cost $2 each and binders cost $5 each. Write an equation you can use to find the number of binders you bought.

*asked on February 12, 2018* -
## Physics

Oasis B is a distance d = 7.0 km east of oasis A, along the x axis shown in the figure. A confused camel, intending to walk directly from A to B instead walks a distance W1 = 22 km west of due south by angle θ1 = 15.0°. It then walks a distance W2 = 34

*asked on February 9, 2014* -
## math

3 pumps, working 6 hours a day, can empy a water tank in 2 days. How many hours a day must 9 pumps work to empty the same tank in 1 day?

*asked on January 26, 2013* -
## Database design

How can you conduct evaluation and revision within the SDLC and DBLC frameworks? Maybe try here: http://www.google.com/search?hl=en&lr=&as_qdr=all&q=SDLC++DBLC+frameworks+evaluation+evaluate Thanks Lance but I do not find what I need there, or if it is I

*asked on July 25, 2006* -
## Please help with Calculus??

Boxes are labeled as containing 500g of cereal. The machine filling the boxes produce weights that are normally distributed with standard deviation 12g. 1) Suppose a law states that no more than 5% of a manufacturer's cereal boxes can contain less than the

*asked on November 8, 2013* -
## Calculus

Snow is falling vertically at a constant rate of 8.0 m/s. At what angle from the vertical do the snowflakes appear to be falling as viewed by the driver of a car traveling on a straight, level road with a speed of 50k.h?

*asked on September 26, 2013* -
## Calculus

Two cars start moving from the same point. One travels south at 60 mph and the other travels west at 25 mph. At what rate is the distance between the cars increasing 2 hours later? Let x = the distance covered by the south traveling car. Let y = the

*asked on June 28, 2013* -
## psychology

Identify intervention strategies to deal with burnout

*asked on August 15, 2012* -
## Chemistry AP

what does this mean (we are on quantum) The figure below represents part of the emission spectrum for a one-electron ion in the gas phase. All the lines result from electronic transmissions from excited states to the n = 3 state. the graph is like this A B

*asked on October 21, 2008* -
## math

A car averaged 48 miles per hour traveling 672 miles from Washington to Orlando. How long was the trip?

*asked on April 13, 2020* -
## math

Jay spent 6 hours playing games, studying and talking with his friends. he spent 2/5 of the time playing games and 1/2 of the time studying. how many minutes did he spend talking with his friends?

*asked on February 27, 2019* -
## math

In the continental United States, the ratio of states that border an ocean to states that do not border an ocean is 7 : 9. How many of the states border an ocean?

*asked on November 27, 2018* -
## math

6 1/2 - 7/8 divided by 5 11/16

*asked on September 27, 2018* -
## math

Write an equation for the following problem... you spend $16 on 3 notebooks and x binders. Notebooks cost $2 each and binders cost $5 each. Write an equation you can use to find the number of binders you bought.

*asked on February 12, 2018* -
## algebra

how do you simplify (sqrt18)over(sqrt8)-3? And (4-3sqrt2)squared? I tried but get some unreal answer. thanks in advance.

*asked on March 24, 2015* -
## Calculus

According to the National Health Survey, the heights of adult males in the United States are normally distributed with mean 69.0 inches and standard deviation 2.8 inches. A. What is the probability that an adult male chosen at random is between 61 inches

*asked on November 3, 2013* -
## MATH

Create a graph of a function given the following information: The instantaneous rate of change at x = 2 is zero. The instantaneous rate of change at x = 3 is negative. The average rate of change on the interval 0

*asked on July 19, 2013* -
## Calculus

Evaluate the integral below by interpreting it in terms of areas. In other words, draw a picture of the region the integral represents, and find the area using geometry. ç6 −6 36−x^2dx

*asked on July 15, 2013* -
## math

During a sale at the local department store, you buy three sweatshirts and two pairs of sweatpants for $85.50. Later you buy three more sweatshirts and four more pairs of sweatpants for $123.00 What is the sale price of each sweatshirt and each pair of

*asked on November 13, 2011* -
## Algebra

Gary has 3y comics. Shaun has 8 comics. They share their comics equally. How many comics does each of them have?

*asked on April 9, 2019* -
## math

you buy a ring box as a birthday gift that is in the shape of a triangular prism. What is the least amount of wrapping paper needed to wrap the box? The lengths of the box are 14.5 cm, 8 cm, 10 cm, 10.5 cm

*asked on March 21, 2019* -
## math

s+1/4=4/8 solve the proportion

*asked on March 4, 2019* -
## math

you are creating identical candy bags using 18 chocolate bars and 30 peanut butter cups. What is the greatest number of bags you can fill using all the candy

*asked on June 11, 2018* -
## math

a figure is made up of a big square and 4 smaller identical squares. The area of the whole figure is 980 square inches. What is the unknown length?

*asked on May 21, 2018* -
## math

Your bedroom is in the shape of a square that is 12 feet long on each side. Will a circular rug with a circumference of 40.82 feet fit into your room? If not, by how many feet is the rug too wide?

*asked on March 21, 2018* -
## math

on a 10 question quiz you correctly answer four one point questions and five two point questions. you earn 87.5% of the possible points on the quiz. a. how many possible points is the quiz worth b. how many questions did you miss c. how many points was

*asked on March 1, 2018* -
## math

1/8+6/7+1/6=

*asked on February 28, 2018* -
## math

Two vertices of a triangle are F (1, −4) and G(6, −4). List two possible coordinates of the third vertex so that the triangle has an area of 20 square units.

*asked on February 5, 2018* -
## math

jill has 8 yards of cloth. she wants to cut it into pieces that are 1/4 yard long. How many pieces can she cut from the length of cloth

*asked on January 10, 2018* -
## math

write the fraction or mixed number as a percent 23/40

*asked on December 6, 2017* -
## math

y/9=44/54

*asked on December 4, 2017* -
## math

a square has side length of 6 inches. a parallelogram has a base of 6 inches. the area of the square is equal to the area of the parallelogram what is the height of the parallelogram?

*asked on November 16, 2017* -
## Math

Is -n always, sometimes, or never a positive number? Explain. I don't know what they mean by -n - is a negative number?

*asked on September 1, 2016* -
## geometry

Given m

*asked on April 6, 2015* -
## math

I have 23 hundreds, 47 tens, 5 ones, 8 tenths and 10 hundredths. What number am I. We got the numbers to the left of the decimal - 2775 but to the right is it .81 or .18 or .9 as 10 hundredths is the same as 1 tenth so add 8 tenths and 1 tenth together?

*asked on January 28, 2015* -
## Statistics

Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability of success on a single trial, n=9, x=2, p=0.35.

*asked on August 25, 2014* -
## albebra

solve arithmetically and algebraically. The perimeter of a rectangle is 54 cm. Its length is 6 cm. What is its width?

*asked on April 14, 2014* -
## business communication CO210

Prepare a one-page description of your plans to solve the problem for one of the following research studies. Use the following headings for the problem:

*asked on April 8, 2014* -
## Physics

In the sum A+B=C, vector A has a magnitude of 10.2 m and is angled 48.0° counterclockwise from the +x direction, and vector C has a magnitude of 15.0 m and is angled 22.0° counterclockwise from the -x direction. What are (a) the magnitude and (b) the

*asked on February 9, 2014* -
## Physics

A particle starts from the origin at t = 0 and moves along the positive x axis. A graph of the velocity of the particle as a function of the time is shown in the figure; the v-axis scale is set by vs = 7.0 m/s. (a) What is the coordinate of the particle at

*asked on February 5, 2014* -
## Calculus

How can I get partial sums of a series on a TI 89 calculator?

*asked on November 26, 2013* -
## Calculus

Solve the separable differential equation 10x−6ysqrt(x^2+1)dy/dx=0. with the initial condition y(0)=4.

*asked on November 18, 2013* -
## READING

VOCABULAY/CONTEXT CLUES WHAT DOES COMBUSTION MEAN? wHAT CLUES HELP YOU TO DETERMINE THE MEANING? wHAT IS A WAFT? WHAT CLUES HELP YOU TO DETERMINE THE MEANING? HOW DOE CONTEXT CLUES HELP YOU DTERFMINE THE MEANING OF DINGY?

*asked on November 5, 2013* -
## Calculus

A) Find the average value of f(x)=x^3-x+1 on the interval (0,2) B) Find c so that f(c)equals the average value

*asked on November 3, 2013* -
## statistics

a sample of 50 women is obtained and their heights (in inches) and pulse rates (in beats per min) are measured. the linear correlation coefficient is 0.229 and the equation of the regression line y= 17.9 +0.870x where x represents hight. the mean of the 50

*asked on October 22, 2013* -
## Calculus

Determine whether the integral is divergent or convergent. If it is convergent, evaluate it. If it diverges to infinity, state your answer as INF. If it diverges to negative infinity, state your answer as MINF. If it diverges without being infinity or

*asked on October 20, 2013* -
## Calculus Please Help??

Evaluate the integral (3x^2-16x-19)/(x^3-4x^2-3x+18)

*asked on September 27, 2013* -
## math

how much combined tax should be withheld from the paycheck of a married employee earning $910 per week and claiming three withholding allowances.

*asked on September 5, 2013* -
## MATH

f(x)=3x+2 g(x)=-2x+1 a) Write an equation for ( f+ g)(x) b) Determine (f+g)(6) c) Determine (fg)(6) d) Determine the domain of (f/g)(x)

*asked on July 19, 2013* -
## Calculus

Find the absolute maximum and the absolute minimum values of f(x)=x−7cos(x) on the interval [−ð,ð).

*asked on July 7, 2013* -
## Calculus

Find the values of a ,b, and c in the quadratic function p(x)=ax^2+bx+c such that p(2)=6, p'2)=2, and p''(2)=3. a = b = c =

*asked on June 17, 2013* -
## Calculus

If a ball is thrown straight up into the air with an initial velocity of 95 ft/s, its height in feet after t seconds is given by f(t)=95t−16t^2 Find the average velocity for the time period beginning when t=1 and lasting (i) 0.5 seconds (ii) 0.1 seconds

*asked on May 31, 2013* -
## Physics true false

true false The speed of a particle is always positive. True False The average speed of a particle is equal to the magnitude of its average velocity. True False The acceleration of a particle can be non-zero when its speed is constant. True False When the

*asked on February 26, 2013* -
## Chemistry

two solutions are prepared using the same solute solution a: 0.27g of the solute disolves in 27.4g of t-butanol solution b: 0.23g of the solute disolves in 24.8g of cyclohexane which solution has the greatest freesing point change? show calculations and

*asked on February 18, 2013* -
## Math

Rearrange this expression into quadratic form, ax2 bx c = 0 0.20= ((x^2)/(55-x)) where a = 1, and identify the values of b and c.

*asked on February 18, 2013* -
## Enlgish, possessive form of singular and plural no

possessive form of family, brother, suitcase, child, government, pen, train, tree, woman, refugg, families, brothers, suitcases, children, governments, pens, trains, trees, women,refugees

*asked on October 25, 2012* -
## english, possessive nouns

Directions: Wrie each sentence. Change the underlined phrase to show possession. The honesty of children is refreshing. The honesty of children is the underline part of the phrase.

*asked on October 23, 2012* -
## Algebra

69% of the students at a school are involved in after-school activities. There are 598 students in the school. Which is the best estimate of the number of students in after school activities? A. 360 B. 380 C. 420 D. 450

*asked on January 2, 2012* -
## science

When water is split into hydrogen and oxygen what happens- is it a change in matter

*asked on November 30, 2011* -
## com 155

• Write several sentences describing a recent interaction with a friend or family member about personal finance or credit cards. This interaction may be imagined or real. • Use at least five different pronouns in your sentences. • Identify all

*asked on January 30, 2011* -
## Psychology

what is an example of "case study method" psychology?

*asked on November 26, 2010* -
## Mat 116

-3/4x= -5/6 -3/4 + 3/4= -5/6+ 3/4 x= - 1/12 Is this right Please help!

*asked on April 11, 2010* -
## Mat 116

Solve the system by graphing 8x-6=-18 6y-8x=18 divide 1 equation by 2 4x-3y=-9 divide 2 equation by -2 -4x-3y=-9 this makes both equation dependent slope intercept of two equation 4x-3y=-9 3y=4x+9 this makes this consistent. Just helping if I can.

*asked on April 11, 2010* -
## Mat 116

0.5x+1

*asked on April 11, 2010* -
## Mat 116

Solve using multiple principle. 7x=-56 The solution x= -8 or x= 7(-8)= -56

*asked on April 11, 2010* -
## Mat 116

substitution method 7x +9y= 19 x=25-5y I read over all the problems I do not see any errors I can find. Please point this out! After this I have another problem 0.1

*asked on April 11, 2010* -
## Mat 116

substitution method 7x +9y= 19 x=25-5y ___________ 7(25-5y)+9=19 175-35 +9=19 -175 -175 _______________ -26y= -156 y=6 substitute for x x=25-5y x=25-5(6) x=25-30 x=-5 now substitute 7x+9y=19 7(-5)+ 9(6)=19 -30+56=19 19=19 his part is wrong I believe

*asked on April 11, 2010* -
## chemistry

How do it geth the equation for 50.0 grams of iron(II)carbonate react completely with hydrochloric acid how many grams of carbon dioxide gas may be produced?

*asked on November 6, 2009* -
## 8th grade

essay on should students only have to take reading andmath to go to 9th grade agree or disagree?

*asked on April 13, 2009* -
## database design

Explain the interactions among end user, data, information, and decision making. Draw a diagram and explain the interactions Since this is not my area of expertise, I searched Google under the key words "database 'end user' 'decision making'" to get these

*asked on August 24, 2006* -
## math

PV=nRT solve for T

*asked on May 29, 2020* -
## math

1/4(n-6)=1/4n-3/2

*asked on May 26, 2020* -
## math

A calcium ion has 20 protons and 18 electrons. Each proton has a +1 charge and each electron has a -1 charge. What is the charge of the calcium ion?

*asked on April 14, 2020* -
## math

How long will it take a bird traveling at an average speed of 12 miles per hour to travel 202 miles while flying south for winter?

*asked on April 13, 2020* -
## math

A cheetah traveling at 31 m/s chased its prey for 11 seconds. What distance did the cheetah travel during the chase?

*asked on April 13, 2020* -
## math

Light travels at 186,000 miles per second. Light takes about 11⁄3 seconds to travel from the earth to the moon. Calculate the distance between the earth and the moon based on the speed of light.

*asked on April 13, 2020* -
## math

You are having a lemonade stand and the ingredients to make lemonade comes out to about $.08 per cup. If you sell each cup for $.75 by what percentage did you markup a cup of lemonade?

*asked on February 3, 2020* -
## math

3(x+4)>12

*asked on January 16, 2020* -
## math

Shawntelle is solving a problem involving a triangular pyramid. You hear her say that "bee" is equal to 24 inches. How can you tell if she is talking about the base area B of the pyramid o about the base b of the triangle?

*asked on December 8, 2019*