Friday

December 9, 2016
Total # Posts: 962

**Chemistry**

How many grams of I2 are present in a solution if 39.85mL of 0.160M Na2S2O3 solution is needed to titrate the I2 Solution

*March 14, 2014*

**Algebra 1**

Minnie is painting her wall-in closet. Each gallon of paint covers 275 square feet.The closet is in the shape of a right rectangular prism. The floor is 9 feet wide and 7 feet long. The ceiling is 8 feet high. How many gallons of paint should Minnie buy to cover the four walls...

*March 8, 2014*

**Algebra 1**

How many two-digit numbers have a tens digit that is greater than the units digit? Explain.

*March 8, 2014*

**Algebra 1**

If 20% of your classmates own an iPad, 12% own an iPad and an iPhone, and 74% own neither, what percentage own an iPhone? Explain.

*March 8, 2014*

**Algebra 1**

Ok thank you very much!

*March 8, 2014*

**Algebra 1**

Um would it be C) 1356.48 km squared, 1) 500*48= 24000 meters or 24 km 2) 500*24= 12000 meters or 12 km 3) 3.14*24^2= 1808.64 km^2 4) 3.14*12^2= 452.16 km^2 5) 1808.64- 452.165= 1356.48 km^2 The spill grew 1356.48 kilometers squared in between 48 and 24 hours.

*March 8, 2014*

**Algebra 1**

Dont you see the multiple choice answers I gave?! And that's steves request.

*March 8, 2014*

**Algebra 1**

I don't see Reiny's request anywhere in this queston.

*March 8, 2014*

**Algebra 1**

Yes i saw but I didn't ignore it.

*March 8, 2014*

**Algebra 1**

Choose from the following^

*March 8, 2014*

**Algebra 1**

A) 452.16 km squared B) 12,000 km squared C) 1356.48 km squared

*March 8, 2014*

**Algebra 1**

A circular oil spill is spreading over the surface of a lake. The circle's radius grows by 500 meters every hour. How many square kilometers did the spill grow between 24 hours and 48 hours? Explain.

*March 8, 2014*

**Algebra 1**

Ohh ok thank you! I understand now!

*March 8, 2014*

**Algebra 1**

Please explain, i'm having trouble understanding.

*March 8, 2014*

**Algebra 1**

Mr. Keskin and his wife have a cell phone plan that charges them $5 for 200 text messages per month for each of their phones. The Keskins are charged an additional $0.12 for each text message over their 200-text-message limit. Their carrier has offered them unlimited text ...

*March 8, 2014*

**Algebra 1**

Lets just say He signs up In july, for the 20% discount.

*March 8, 2014*

**Algebra 1**

Matthew would like to join an online book club that costs $84 per year. If he signs up for an automatic renewal, he will get 5% off his membership. If he signs op in July, he will get an additional 20% off. In addition, for every 2 people he refers to the club, he can get $5 ...

*March 8, 2014*

**Algebra 1**

If 111 -> 13, 112 -> 24, 114 -> 46, and 115 -> 57, complete this statement: 117 -> ____. Explain.

*March 8, 2014*

**Algebra 1**

Mrs. Crenshaw has confiscated 4 cell phones from 4 different students because they used them during class. To get the cell phones back, they have to answer the following question: What is the probability that no student receives his or her own phone if Mrs. Crenshaw hands them...

*March 8, 2014*

**Algebra 1**

Ok thank you. I understand now.

*March 8, 2014*

**Algebra 1**

What is the first natural number that is a perfect square and a perfect cube? Can you find the second? The third? Explain.

*March 8, 2014*

**Algebra 1**

Buying paint in large quantities is often less expensive. Five 1-gallon buckets cost 25% more than a single 5-gallon bucket. Suppose that a job requires g gallons of paint. For what values of g should a 5-gallon bucket be purchased to minimize cost? Explain.

*March 8, 2014*

**Chemistry:Important!!!!!!!**

20.00 mL of a H2SO4 solution with an unknown concentration was titrated to a phenolphthalein endpoint with 39.13 mL of a 0.1061 M NaOH solution. What is the concentration of the H2SO4 solution?

*March 3, 2014*

**Help!!!!!!!!!!!!**

A 0.391 g sample of KHP will be titrated with a NaOH solution with an assumed concentration of 0.100 M. Calculate the volume of NaOH that should neutralize the KHP sample.

*March 3, 2014*

**Pre-Calc**

Eliminate the parameter x = t^2 - 1 and y = t^2 + t

*March 2, 2014*

**Math**

state the smallest interval for 5 sin theta to produce a complete graph.

*February 27, 2014*

**Pre-Algebra**

Your baseball team has won 6 games and lost 4 games. If the team does not lose any more games, how many games must the team win to have a win: loss ratio of 2:1.

*February 24, 2014*

**Math**

does the i mean income?

*January 28, 2014*

**Math**

A certain country taxes the first $20,000 of an individual's income at a rate of 15%, and all income over $20,000 is taxed at 20%. a. Al makes $16,000. Betty makes $36,000. How much is each taxed? b. Write a piecewise function T that specifies the total tax on an income of...

*January 28, 2014*

**english**

The plane came down later than expected. In this sentence ,what part of speech is the word down?

*January 17, 2014*

**Algebra**

I need help understanding algebra

*January 11, 2014*

**math**

Kira walked at a faster rate.😉

*January 1, 2014*

**Math**

You're formula Reiny is right, but your numbers are incorrect. You should only use 12 hours not 36 as the patient received the medication at midnight and going to noon is only 12 hours. Therefore the answer is 12.61mg left in the bloodstream.

*December 14, 2013*

**Calculus I don't understand**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y = 10 x and y = 5 x^2 about y =0 Find the volume of the solid obtained by rotating the region bounded by y=8 x^2, x = 1, and y = 0 , about the x-axis. I saw some...

*December 4, 2013*

**Math - Algebra 2**

THANK YOU! THANK YOU! THANK YOU!!!

*December 1, 2013*

**Math - Algebra 2**

I have tried several times to solve this. I have 3 points (0,-5), (3, -6), (-3,-7). I'm trying to get the quadratic equation. I keep getting y=(-1/6)x^2+ (1/6)x +0. When i plug in other numbers to check it's not the parabola facing down like my image. Please help!

*December 1, 2013*

**DE Science**

I am thinking A. A scientist claims plants and animals that exhibit reproductive cycles based on the changing seasons are highly affected by climate change. What is the correct justification of the scientist's claims? A) Climate change can cause a timing mismatch of energy...

*November 14, 2013*

**math**

The permutataion of 7 the arrangement number of the seven music files would be 7*5*4*3*2*1=

*November 14, 2013*

**algebra**

If a Realtor earns ^% commission for selling a $70,000 home, what is the amount of the commission?

*November 12, 2013*

**algebra**

There are two-digit perfect squares whose square roots are the same as their units digits. What is the sum of these squares?

*November 12, 2013*

**Physics**

Piston Circle 1 in the figure below has a diameter of 0.29 in.; Piston Circle 2 has a diameter of 1.7 in. In the absence of friction, determine the force vector F necessary to support the 500-lb weight.

*November 7, 2013*

**Math**

Value Rent-a-Car rents a luxury car at a daily rate of $37.01 plus 10 cents a mile. A business person is allotted $100 for car rental each day. How many miles can the business person travel on the $100? _______miles

*October 28, 2013*

**Math**

A growing number of colleges are teaming up with banks to issue student ID cards that double as debit cards. There were 51 such partnerships in 2003. This number grew to 127 in 2006. What is the percent of increase?

*October 28, 2013*

**Algebra**

The formula B=30a is used in New England to estimate the minimum furnace output, B, in BTU's for a modern house with the amount of square feet of flooring, a a. determine the minimum furnace output for a 2000 ft2 modern house b. solve the formula for a What is the minimum ...

*October 28, 2013*

**accounting**

using the break-even equations to solve for price and variable cost per unit andromeda company's break-even point is 2,400 units. variable cost per unit is $42; total costs are 67,200 per year. what price does andromeda charge?

*October 25, 2013*

**physics**

(a) One of the moons of Jupiter, named Io, has an orbital radius of 4.22 108 m and a period of 1.77 days. Assuming the orbit is circular, calculate the mass of Jupiter. (b) The largest moon of Jupiter, named Ganymede, has an orbital radius of 1.07 109 m and a period of 7.16 ...

*October 22, 2013*

**PHYSICS**

A 3.8-kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 2.1 m/s2, find the force exerted by the rope on the bucket.

*September 28, 2013*

**physics**

A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are d1 = 3.98 m to the north, d2 = 2.01 m northeast, and d3 = 1.12 m at 30.0° west of south (see the figure). Starting at the same initial point, an expert golfer ...

*September 26, 2013*

**Physics**

A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are d1 = 3.98 m to the north, d2 = 2.01 m northeast, and d3 = 1.12 m at 30.0° west of south (see the figure). Starting at the same initial point, an expert golfer ...

*September 25, 2013*

**Math**

I can not remember the rules and how to do the problems Square of 200 ...simplified Square root of 7/16 -simplified

*September 18, 2013*

**Physics**

Henry how did you know that the angles were 90, 45 and 240?

*September 15, 2013*

**math**

Domain

*September 14, 2013*

**math**

f(x)= 1/x^2-8x-9 g(x)= 1/x^2+3x+2

*September 14, 2013*

**Math**

ok i get it now. for this question.. 3square root of 1/2x+1 +2=5 the +2=5 is out of the square root. so do i get rid of the square root first or subtract 2 from 5

*September 14, 2013*

**science**

Medicine A will reduce the incidence of headaches . what is the independent variable and dependent variable and the two controlled variables?

*September 12, 2013*

**Chemistry**

R2Q

*September 7, 2013*

**Chemistry**

Two elements, R and Q, combine to form two binary compounds. In the first compound, 9.50 g of R combines with 3.00 g of Q. In the second compound, 7.00 g of R combines with 4.50 g of Q. Show that these data are in accord with the law of multiple proportions. If the formula of ...

*September 7, 2013*

**history**

HOW DID SPAIN ESTABLISH TERRITORIAL CLAIMS IN THE CARIBBEAN AND SOUTH AMERICA?

*August 26, 2013*

**Math**

In Class A there are 80 the Boy to Girl ratio is 3 to 5. In Class B the boy to girl ratio is 3 to 2. If the 2 classes combined have an equal number o fboys and girls how many students are in class B?

*August 19, 2013*

**math**

One number is 5 times another. Write an expression for the sum of their reciprocals. Then simplify the expression. (Use x for the variable.)

*July 25, 2013*

**trig**

A bird at the top of a tree looks down at a field mouse with an angle of depression of 65 degrees. If the field mouse is 30 meters from the base of the tree, find the distance from which the field mouse to the bird's eyes. Round the answer to the nearest tenth.

*July 22, 2013*

**Physics**

A spring with a spring constant of 22N/m is initally compressed by 2.3cm. How much work is required to compress the spring an additional 1.7 cm? I can't find information in my book about compression; only work and exertion. Please help and provide all steps for work. Thank...

*June 23, 2013*

**business math**

If the interest rate is 3% and a total of $4,370.91 will be paid to you at the end of 3 year, what is the present value of that sum.

*June 23, 2013*

**math**

Consider the following. (Give your answers correct to four decimal places.) (a) Determine the level of confidence given the confidence coefficient z(á/2) for z(á/2) = 1.65. Incorrect: Your answer is incorrect. . (b) Determine the level of confidence given the ...

*June 22, 2013*

**math help**

We have look at this site and it did not help us at all, with it only giving us the a = 0.05, we do not know how to work it out. There has been 4 of us working on this and no one can get it.

*June 22, 2013*

**math help**

occurs if you reject the null hypothesis when it I true

*June 22, 2013*

**math help**

Sorry if this has been posted twice, but we have tried this numerous times and can not work it. Due in the morning. Suppose that a hypothesis test is to be carried out by using á = 0.05. What is the probability of committing a type I error? (Give your answer correct to ...

*June 22, 2013*

**Math**

The image of the public library is constantly changing, and their online services continue to grow. Usage of the library's home page grew by 17% during the past 12 months. It has been estimated that the current average length of a visit to the library's homepage is ...

*June 22, 2013*

**math check**

Thank you

*June 21, 2013*

**COP 2000-6**

show an example of an user inputs a list of positive numbers terminated by 0 into an array, find the mean of the numbers in the array, and outputs th result. use a subprogram to input the numbers, a function to find the mean, and a subprogram to output the result

*June 17, 2013*

**Algerbra**

Write the equation of the circle in standard form. Find the center, radius, intercepts, and graph the circle. x2+y2+16x−18y+145=25 Standard form (x-h)^2 +(y-k)^2 k

*June 12, 2013*

**fractions**

3/4 and 7/8

*June 11, 2013*

**Math 208**

nico is saving money for his college education. He invests some money at 6%, and $1400 less that that amount at 5%. The investments produced a total of $172 interest in 1 yr. how much did he invest at each rate?

*May 20, 2013*

**Social studies**

How did monteqeieus system reflect John lockes ideas about government ?

*May 19, 2013*

**Math**

A kite is 32m above from the ground. The angle the kite string makes with the ground is 39°. How long is the kite string, to the nearest metre?

*April 29, 2013*

**Math**

For a Normal distribution with mean, mu=2, and standard deviation, sigma = 4, 70% of all observations have values between x and y . (Round to 4 decimal places.)

*April 15, 2013*

**chemistry**

Fe2O3(s) + 3H2(g) = 2Fe+3(s) + 3H2O (lig) -6e Fe(III) = +3 Oxygen = -2 Fe(III) Oxide then would need 2 Fe(III) to give +6 and 3 Oxygen to give -6 in valence charges to give a neutral molecule.

*April 15, 2013*

**east brainerd elementary**

No. He would need 110 coins for 2 games, because 100-55=45, which is less than what he needs for two. He can only play one game. Sorry Tom!

*April 3, 2013*

**Algebra**

Need help finding composition of functions. I am doing something wrong continue to get wrong answer f(x)=x+6/x+5, g(x) = 2x-7. Find (fog)(x)

*March 25, 2013*

**chemistry**

i would like to know how to work through it

*March 23, 2013*

**chemistry**

What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA–, A2–) at pH 8.98?

*March 23, 2013*

**chemistry**

Determine [Zn2 ], [CN–], and [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 1.78. The Ksp for Zn(CN)2 is 3.0 × 10–16. The Ka for HCN is 6.2 × 10–10.

*March 23, 2013*

**chemistry**

Consider a solution made by mixing 500.0 mL of 0.04182 M Na2HAsO4 with 500.0 mL of 0.03645 M NaOH. Complete the mass balance expressions below for Na and arsenate species in the final solution. There are 4 arsenate species, but I only got three of them. I am unsure of what the...

*March 23, 2013*

**quantitative chemistry **

Consider a solution made by mixing 500.0 mL of 0.04182 M Na2HAsO4 with 500.0 mL of 0.03645 M NaOH. Complete the mass balance expressions below for Na and arsenate species in the final solution. There are 4 arsenate species, but I only got three of them. I am unsure of what the...

*March 22, 2013*

**quantitative chemistry **

Determine [Zn2 ], [CN–], and [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 1.78. The Ksp for Zn(CN)2 is 3.0 × 10–16. The Ka for HCN is 6.2 × 10–10. I know the following is what needs to be done, but im unsure of how to go about it. 1. ...

*March 22, 2013*

**chemistry**

Determine the molar solubility (S) of Zn(CN)2 in a solution with a pH = 4.91. Ksp (Zn(CN)2) = 3.0 × 10-16; Ka (HCN) = 6.2 × 10-10.

*March 21, 2013*

**chemistry**

Ignoring activities, determine the molar solubility of copper (I) azide (CuN3) in a solution with a pH of 10.83. Ksp (CuN3) = 4.9 × 10–9; Ka (HN3) = 2.2 × 10–5.

*March 21, 2013*

**Art**

Describe how elements of art and principles of design work together to form a composition

*March 19, 2013*

**art**

Analyse a work of art for example Jacob Lawrence "GOING HOME" to describe how he used both elements of art and principles of design to create a strong composition.

*March 19, 2013*

**Art**

Describe how elements of art and principles of design work together to form a composition

*March 19, 2013*

**college algebra**

I need help bad. Don't know which formula to use. Please explain step by step. 2x^2-12x+19. Find the interval where f is increasing and decreasing.

*March 18, 2013*

**Math**

Find the number of each kind of object in the collection. Sue's Card Collection 8 packs of baseball cards 3 fewer packs of hockey cards than football cards 17 packs in all

*March 14, 2013*

**Physical Science**

We divade 32 by 0,1

*March 11, 2013*

**programming (C#)**

Write a console-based program that accepts a user's message and determines whether it is short enough for a social networking service that does not accept messages of more than 140 characters.

*March 2, 2013*

**Multivariable Calculus**

Find the linearization L(x,y)of the function f(x,y) at P_0. Then find an upper bound for the magnitude |E| of the error in the approximation f(x,y)=L(x,y) over the rectangle R. f(x,y) = (1/2)x^2 + xy + (1/4)y^2 + 3x - 3y + 4 at P_0(2,2),R:|x-2|<=0.1, |y-2|<= 0.1

*February 26, 2013*

**algebra**

A video game manufacturer is planning to market a new machine. The fixed costs are $550,000 and the variable costs are $120 per machine. The wholesale price of the machine will be $140. How many game machines must be sold for the company to make a profit? my answer was 27,500 ...

*February 24, 2013*

**Chemistry**

Yes, the answer Kc=0.517

*February 23, 2013*

**Chemistry**

Consider this equilibrium process at 686°C. CO2(g) + H2(g) CO(g) + H2O(g) The equilibrium concentrations of the reacting species are [CO] = 0.050 M, [H2] = 0.045 M, [CO2] = 0.086 M, and [H2O] = 0.040 M. (a) Calculate Kc for the reaction at 686°C. (b) If the ...

*February 23, 2013*

**Math**

just kidding

*February 22, 2013*