Tuesday

February 21, 2017
Total # Posts: 1,625

**organic chemistry**

m/mm* n(H+) + [HCl] * Va*n(+)+) = [NaOH]*Vb*n(OH) 0.68g/mm*2 + [0.02M]*0.025L*1 = [0.5M]*0.03L*1 PO4=mol

*January 17, 2016*

**organic chemistry**

0.68g of a solid diprotic acid was dissolved in 30.0mL of a 0.50 NaOH sol'n. the resulting mixture was then back-titrated against 0.20 M HCl; 25mL were required. Calculate the molar mass of the acid. This acid is a solid salt of a triprotic acid, identify this acidic salt.

*January 17, 2016*

**Physics**

3.34*10^17

*January 13, 2016*

**Physics**

An object moves with acceleration given by a = -6t^3 m/s^2. Its initial velocity at t = 0 is 5 m/s. How far will it move before stopping? ((((((The answer is " 7.5 m " ))))) Can you please show me the solution.

*January 13, 2016*

**machanics**

show that theoretically the period of rotation of a satelite which circles a planet of negligible distance firm its surface depends only on the density of the planet

*January 12, 2016*

**MATH**

In still water, a speed boat travels 5 times faster than the current of the river. If the speed boat can travel 48 miles upstream and 10 back in 5 hours, find the rate.

*January 7, 2016*

**Algebra**

go try your best not sure what the answer is

*January 1, 2016*

**Maths**

Ainsley’sandCaleb’sapartmentbuildingsareexactlythesameheight. Ainsley measures the distance between the buildings as 51 m and observes that the angle of depression from the roof of her building to the bottom of Caleb’s is about 64°. How tall, to the nearest ...

*December 16, 2015*

**Maths**

Ainsley’sandCaleb’sapartmentbuildingsareexactlythesameheight. Ainsley measures the distance between the buildings as 51 m and observes that the angle of depression from the roof of her building to the bottom of Caleb’s is about 64°. How tall, to the nearest ...

*December 15, 2015*

**Maths**

To use an extension ladder safely, the base must be 1 m out from the wall for every 2 m of vertical height. a) What is the maximum angle of elevation, to the nearest degree, to the top of the ladder? b) If the ladder is extended to 4.72 m in length, how high can it safely ...

*December 15, 2015*

**Structures**

Thank you so much!

*December 13, 2015*

**Structures**

A wood column is 5.5 in. square in cross section and 12 ft long. Its modulus of elasticity is 1.3 × 106 psi. How much will the column shorten under a compressive load of 36,000 lb?

*December 13, 2015*

**Chemistry**

You have to consider if it hydrogen-bonds with water. The stronger the H-bonding is, the higher the boiling point will be.

*December 7, 2015*

**Math**

Jeff and his friend each text four classmates about a concert. Each classmate then text four students from another school about the concert. If no one receives the message more than once, how many students from the other school receive a text about the concert.

*December 2, 2015*

**Computer Science**

i Need help, using loops, visual studio 2013. write a program using loops that will calculate the following, how much would $24 deposited in a bank in 1626, have been worth at the end of this year if it had received an interest rate of 6% compounded annually compounded ...

*December 1, 2015*

**math**

Thank you very much Damon :)

*November 16, 2015*

**math**

A cyclist travels for 60km at x km/h and 180km at y km/h and takes 10 hours altogether for the journey. If the speed are interchange, the journey takes 8.6 (8 whole number 2 over 3) hours. Find x and y.

*November 16, 2015*

**physics**

The AM frequencies of a radio dial range from 550 kHz, and the FM frequencies range of 88.0 MHz to MHz. all of these radio waves travel at a speed of 3.0x10^8 m/s, what are the wavelenght ranges of a.) the aM brand b.) FM brand

*November 14, 2015*

**Phsyics**

You place a 6.9 kg television set on a spring scale. The acceleration of gravity is 9.8 m/s2 . If the scale reads 75.43 N, what is the ac- celeration of gravity at that location? Answer in units of m/s2.

*November 6, 2015*

**Chemistry**

Calculate the grams of a product that is produced when there is 23 gms of each product Al2O3

*November 6, 2015*

**algebra**

The numerator of a fraction , equivalent to 3/4, is increased by an amount so that the value of the resulting fraction is 5/2. Find amount that the numerator is increased.

*October 29, 2015*

**college algebra help********

The answer that nia1598 has provided is wrong!!!!

*October 28, 2015*

**Pathways to Math Literacy**

Mike is putting up a snow fence on the west side of his property. He needs a post at each end to hold the fence up and would like to put a post in every 8 feet. If he uses 25 posts for his fence, how wide is the west side of his property?

*October 26, 2015*

**History**

Thank you!

*October 23, 2015*

**History**

Which answer best explains the contributions of women during the revolutionary war? Women only openly supported the British side during the Revolutionary War, as they feared for their lives while their husbands were away fighting Many women enlisted as soldiers, as was allowed...

*October 23, 2015*

**math**

Given BE = 11, EA = 11, BD = 7, and DC = 7, show that BED ~BAC

*October 21, 2015*

**P6 maths**

40% of Amy's stamps is equal to 75% of Mary's stamps. After Mary has given 25% of her stamps away , Amy has 90 more stamps than Mary. Find the total number of stamps they have at first

*September 25, 2015*

**physics**

The thermal energy stored in 1 kg of gasoline is about 10,000 kcal (42,000,000 J). A small car needs a forward force of about 500 N to move slowly at a constant speed on a leveled road (no change in ME). How far should the car go if all the energy stored in 1 kg gasoline is ...

*September 18, 2015*

**8th grade math**

I need help solving this problem. y=14-1/32x. Y is the number of gallons fuel in tank, x is the number of miles driven. tank contains 8.5 gallons of fuel. y=8.5 8.5=14-1/32x

*September 17, 2015*

**Math**

Mrs.Cress's table measures 5 ft wide and 8 ft long. She wants to cover the table with 3 in squares tiles. How many tiles will she need?

*September 15, 2015*

**Math**

The following are probabilities of selecting items from a bag. What is the probability of selecting other? Jolly rancher: 1/6 Gum: 2/7 Twizzlers: 1/3 other: ?

*September 8, 2015*

**problem solving.**

11

*August 27, 2015*

**Algebra**

(5)^-1/2 * (5x)^5/2 (5x)^-3/2 Simplifies to 1/5 * ã5x^5(1/ã5x^3) My final answer is x/ã5 is that correct?

*August 21, 2015*

**Maths**

At a flower shop , there was a total of 494 sunflowers and roses. After 2/5 of sunflowers and 57 roses were sold , the ratio of number of sunflowers to number of roses were 2:3. How many roses were there at first?

*August 21, 2015*

**niani**

l want you to help me.

*August 16, 2015*

**Alebra 2**

Give the applicable formula or law to use in each situation. If you are given two sides of a triangle and the included angle,how would you find the third side?

*July 16, 2015*

**Orgnic chemistry**

thanks.. but what does it mean to be induced?

*July 10, 2015*

**Orgnic chemistry**

Some molecules w/ non polar bonds like C-S and C-I when exposed to a highly polar environment may assume polarity -Due to vacant d orbitals of S (i don't get this. So if it has a lot of vacant orbitals it will be polar?) -big atomic radius of I (please explain this to me) ...

*July 10, 2015*

**algebra 2**

Write in exponential form. Log[base a]B=2

*June 11, 2015*

**english**

who

*June 3, 2015*

**Socials**

How did Stalin suppress his people's individuality and control their personal and economic lives? I am having trouble researching his methods of control and how his people's lives were affected. I know he initiated a great massacre to terminate anyone who disagreed ...

*May 31, 2015*

**MATH**

1 + 1,893 = 2,893

*May 16, 2015*

**algebra 2**

I'm having troubles understanding how to find the directrix,focus and roots of the parabola y=x^2-5x+4. If you could explain it to me so I understand for myself I'd appreciate it.

*May 12, 2015*

**math**

We throw 250 darts (one by one) at 1200 dart boards. Each dart strikes a board randomly. No dart's strike affects any other. What is the probability that two darts will strike the same board? I make it 1 in 1200, b/c the probability of the 1st dart striking a board is 1. ...

*May 11, 2015*

**math**

An amount of $27,000 is borrowed for 6 years at 8.25% interest, compounded annually. If the loan is paid in full at the end of that period, how much must be paid back?

*May 5, 2015*

**alg**

Indicate which type of comic each of the following represent.1) (x-3)^2/9+(y-2)^2/4=1 2. xy=3 5.(x+2)^2+(y-3)^2=49 6.x^2+4x=y-4

*May 4, 2015*

**History/ Civics**

1.How did the capture of Vicksburg, Mississippi, take advantage of a Confederate weakness? A-The Confederacy had few soldiers and relied on its well-trained generals to win battles. B- The Confederacy had few weapons manufacturers and relied on Vicksburg for ammunition. C- The...

*April 29, 2015*

**History**

1.Which 19th century movements were most associated with each another? A- Socialism and imperialism B- Transcendentalism and utopianism C- abolitionism and manifest destiny D- romanticism and democratic-republicanism 2.The writings of Transcendentalists had the greatest ...

*April 29, 2015*

**statistics**

Of the 6796 students in one school district, 1537 cannot read up to grade level. Among a sample of 812 of the students from this school district, 211 cannot read up to grade level. Find the sample proportion of students who cannot read up to grade level. A. 0.14 B. 0.26 C. 211...

*April 17, 2015*

**Chemistry**

What will be the potential of a cell constructed of a standard hydrogen electrode as one half-cell and a silver wire coated with AgBr dipping into 0.13 M HBr as the other half-cell? The value of Ksp for AgBr is 5.4 × 10-13. For the Ag/AgBr electrode, AgBr(s) + e- --->...

*April 16, 2015*

**math**

The amount of Jen’s monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $10. Find the 25th percentile. A. About $46.30 B. About $43.30 C. About $43.40 D. about $43.20 I came up with $43.26 which its not a choice. Please help!!

*April 16, 2015*

**math**

The amount of Jen’s monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $10. Find the 25th percentile. A. About $46.30 B. About $43.30 C. About $43.40 D. about $43.20 I came up with $43.26 which its not a choice. Please help!!

*April 15, 2015*

**math**

The batting averages of the first three batters in the Eureka College women’s softball team lineup are .310, .301, and .277. If the first three batters are considered as the “lead-off group”, what is the batting average of the group? A. .301 B. .296 C. There is ...

*April 15, 2015*

**Geometry**

Need help, not sure what I am suppose to do. Estimate the area between the graph of 4y = 16 - x^2 and the x-axis. The picture of a mound is on a piece of graph paper. Points A(-4,0) B(0,4)(4,0) Point B is the top of mound.

*April 14, 2015*

**science**

You would expect that an injection of an opiate drug into the __________ would activate dopamine neurons in the nucleus accumbens. A. ventral tegmental area B. medial septal region C. periaqueductal gray matter D. preoptic area My choice is C

*April 13, 2015*

**science**

A panic-prone person who ingests a(n) __________ would be expected to show increased anxiety. A. benzodiazepine agonist B. tricyclic antidepressant C. MAO inhibitor D. benzodiazepine antagonist is it A

*April 13, 2015*

**chemistry**

A 6.07 g sample of nutrients substances burned in a bomb calorimeter containing 2.00 x 10^2 g h2o.what is the fuel value (in nutrient Cal) per gram of sample if the temperature of the water increase 5.70c

*April 13, 2015*

**Chemistry**

At room temperature (25 °C), the gas ClNO is impure because it decomposes slightly according to the equation 2ClNO(g) Cl2(g) + 2NO(g) The extent of decomposition is about 4%. Based upon this, what is the approximate value of ΔG°298 for the reaction at that ...

*April 12, 2015*

**Chemistry**

Given these reactions and their corresponding ΔG° values, Glucose + phosphate → glucose-6-phosphate + H2O; ΔG° = +13.13 kJ ATP + H2O → ADP + phosphate; ΔG° = -32.22 kJ What is the calculated ΔG° for the coupled reaction Glucose...

*April 12, 2015*

**Art**

c b d is correct if you go to connexus. i got 100%

*April 8, 2015*

**Physics**

When a particular wire is vibrating with a frequency of 3.8 Hz, a transverse wave of wavelength 46 cm is produced. Determine the speed of wave pulses along the wire. Answer in units of m/s.

*April 8, 2015*

**Chemistry**

Consider the following equilibrium: At equilibrium, 4.0 × 10-2mol H2, 4.0 × 10-2mol CO, 1.0 × 10-2mol H2O and 1.0 × 10-2mol C were present in a 1.0L container. What is the value of Keq? a) 0.063 b) 16 c) 0.16 d) 6.3 I got b, but I'm not too certain ...

*April 4, 2015*

**chemistry**

AgCl(s) + 2NH3 ==> Cl^- + [Ag(NH3)2]^+ I 0........4.21M.......0 C -2x.......+x..........+x E -2x.......4.21-x......x 3.54x10^-3=(x)(4.21-x)/(-2x)^2 ??? Please help

*April 3, 2015*

**Math**

1. At midnight, you are 60 feet due north of Jonas. You run due east at ten feet per second. Jonas walks two feet per second due north. How many seconds after midnight is Jonas closest to you? What is the corresponding minimum distance separating you and Jonas? 2. We need to ...

*March 28, 2015*

**Math**

Use Newton’s Method to approximate 3^(√7) to four decimal places. Use x1 = 2 as your seed. Round off intermediate iterates to five decimal place

*March 28, 2015*

**Math**

Use Newton’s Method to approximate 3^(√7) to four decimal places. Use x1 = 2 as your seed. Round off intermediate iterates to five decimal places

*March 27, 2015*

**Chemistry**

I don't understand what 62.36 mm hg is, and if you divide that amount by 293k (20 + 273), it doesn't come out to 1.85 mol.

*March 22, 2015*

**Chemistry**

I found this on the internet and I need an explanation. Q: You want to make sure a large weather balloon does not burst and wish to check the temperature at 3000 meters altitude. The balloon manufacture guarantees the balloon up to 60.0 Liters in size. Will the balloon make it...

*March 22, 2015*

**introduction to computing**

Write a C++ program that will accept the marks in a test for a group of 25 students then calculate and display the average mark and highest marks in class.

*March 22, 2015*

**Science**

I answered the questions, but I don't know if my choices are right. 1) Which of the following is an acidic pH? 6 7 8 800 None of the Above Answer: 6 ------------------------------------- 2) Which of the following is directly produced by photosynthesis? Glucose and oxygen ...

*March 21, 2015*

**Geometry**

The point G(5,-9) is rotated 90 degrees about point M(-8,3) and then reflected across the line y=9. Find the coordinates of the image G'. I have no idea where to start. Please advice.

*March 19, 2015*

**Science**

Actually nevermind, I found the answer: Half-life; 28.8 years. You can find the half-life of a substance by dividing the anount at one point in time by the amount remaining afterwards. Then multiply the elapsed time by the common log of 2 and by the amount of time that has ...

*March 12, 2015*

**Science**

Can anyone help me find the half-life of strontium-90? I also need an explanation on how to do it. Thanks!! Radioactive Decay of Strontium-90: At 0 years: 100% remaining At 28 years: 50% remaining At 56 years: 25% remaining At 84 years: 10% remaining At 112 years: 5% remaining.

*March 12, 2015*

**Chemistry**

How many moles of NH3 must be added to 1.00 L of solution to dissolve 0.979 g of CuCO3? For CuCO3, Ksp = 2.3 × 10-10.

*March 10, 2015*

**Math**

A military plane maintains an altitude of 15,000 feet over a vast flat desert. It flies at a constant speed on a line that will take it directly over an observer on the ground. At noon, the angle of elevation from the observer’s shoes to the plane is 30 degrees, and the ...

*March 7, 2015*

**algebra**

Solve.(Find all complex-number solutions.) 12t^2 + 17t = 40

*March 6, 2015*

**algebra**

How do I solve for this: F = Av^2/400, for v (force of wind on a sail).

*March 6, 2015*

**Math**

i still don't understand how you did all of them. can you please elaborate? the answers for #2 is supposed to be 5.728 ft/min and #3 is 3.59in/min

*March 6, 2015*

**Math**

Please help. I have the answers to these problems but I'd like to know how to solve it step by step. 1. Air is being pumped into a spherical balloon at the rate of 1.754 cubic centimeters per second. The balloon maintains a spherical shape throughout. How fast is the ...

*March 6, 2015*

**Math**

What is a “real” zero? 1. A solution to a polynomial. 2. A non-imaginary number. 3.An x-intercept of a polynomial. 4. All of the above. The answer is 4, right?

*February 20, 2015*

**Accounting**

Complete the following exercise. In December 20X2, the Cardoso Company established its predetermined overhead rate for jobs produced during the year 20X3 by using the following cost predictions: Overhead costs: $750,000 Direct labor costs: $625,000. At year-end 20X3, the ...

*February 3, 2015*

**Accounting**

Complete the following exercise. Fill in the Excel spreadsheet provided via the link below to provide your answers to parts a and b. Then paste the Excel data into a Word document on which you can also write the answer to part c. Income Statement Administrative Expenses $ 70,...

*February 3, 2015*

**Chemistry**

Calculate one Al(OH)3 formula unit in grams/unit. I keep arriving at the answer of 1.295 x 10-22 g/unit but my homework says it is incorrect! SOMEONE please help!!!

*January 26, 2015*

**Chemistry.**

Okay, thanks. Do I always round up to the nearest whole number?

*January 10, 2015*

**Chemistry.**

Give the empirical formula of each of the following compounds if a sample contains the following quantities of each element. (a) 0.0091 mol C, 0.0186 mol H, and 0.0045 mol O Please show me how to do this. My notes are very confusing and I don't know how to apply them to ...

*January 10, 2015*

**Physics**

Thank you so much!

*January 7, 2015*

**Physics**

"A moving object has a kinetic energy of 145 J and a momentum with a magnitude of 40.0 kg·m/s. Determine the mass and speed of the object." I simply cannot figure it out. I know that KE=.5mv^2 and that p=mv but I can't seem to piece it together. Please ...

*January 7, 2015*

**History**

It's D!!!!!

*January 5, 2015*

**math**

The weekly marginal cost functions C'(x) and the weekly marginal revenue function R'(x) of a company assembling personal computers are given by C'(x) =RM(3x^2-118x+1315) and R'(x)=RM(1000-4x), where x is the number of computers assembled per week. If the fixed ...

*January 4, 2015*

**Maths**

If the 6th term of an arithmetic sequence is 48, and the sum of the first 6 terms is 300, what is the first term and the constant difference?

*January 4, 2015*

**ALGEBRA**

If I pay RM200 every month for 20 years into an investment account that gives 3% p.a interest compounded monthly, how much will I get at the end of 20 years?

*January 3, 2015*

**ALGEBRA**

if the 6th term of an arithmetic sequence is 48, and the sum of the first 6 term is 300, what is the first term and the constant difference? Pls help as I have never learn this before,need some example to start with.thank you

*January 3, 2015*

**math**

three partitions and x is shown as dimension of a partition

*December 16, 2014*

**calculus**

The position, in feet, of a target is given by s(t)=250-3t+9t^2+2t^3, where t is the time in seconds. The origin of coordinates is at the point where an observer stands, and the positive direction of movement is that one pointing EAST from the origin. What is the initial ...

*December 9, 2014*

**Calculus angle of elevation**

A man is walking towards a wall at 3 ft/sec while looking at a picture on the wall, at a height of 5 feet from the floor. How is the angle of observation changing when the man is 8 feet away from the screen.

*December 9, 2014*

**Physics HELP!**

A 50-g mass is attached to a spring and undergoes simple harmonic motion. Its maximum acceleration is 15m/s2 and its maximum speed is 3.5m/s . Determine the angular frequency. Determine the spring constant. Determine the amplitude of the motion. how do I find these things?

*December 9, 2014*

**Euler's method help in Calculus?????**

Let dy/dx=xy . Use Euler's method with step size of 0.5 and the initial condition of y(0) = 3 to estimate y(2). I really am not sure if I did this right, but I got 3.4568 for y(2). I actually feel like it is wrong.

*December 9, 2014*

**L'Hopitals Rule**

5) Use the L’Hopital’s method to evaluate the following limits. In each case, indicate what type of limit it is ( 0/0, ∞/∞, or 0∙∞) lim x→2 sin(x^2−4)/(x−2) = lim x→+∞ ln(x−3)/(x−5) = lim x→pi/4...

*December 7, 2014*

**MATH EMERGENCY I HAVE 10 MINUTES**

A supplier of portable hair dryers will make x hundred units of hair dryers available in the market when the unit price is p = sqrt(49 + 4.4x) dollars. Determine the producers' surplus if the market price is set at $15/unit. (Round your answer to two decimal places.)

*December 2, 2014*

**MATH CALC**

A supplier of portable hair dryers will make x hundred units of hair dryers available in the market when the unit price is p = sqrt(49 + 4.4x) dollars. Determine the producers' surplus if the market price is set at $15/unit. (Round your answer to two decimal places.)

*December 2, 2014*