Saturday

October 22, 2016
Total # Posts: 1,014

**Analytical chemistry**

Calculate to four decimal places the mass of purely dry MgCO3(Magnesium Carbonate) required to make 1L of a 1000 ppm Mg stock solution.

*October 20, 2016*

**Physics **

Two identical boxcars (m = 14866 kg) are traveling along the same track but in opposite directions. Both boxcars have a speed of 5 m/s. If the cars collide and couple together, what will be the final speed of the pair?

*October 20, 2016*

**physics**

A rectangular loop of wire is placed next to a straight wire, as shown in Fig. 20–55. There is a current of 3.5 A in both wires. Determine the magnitude and direction of the net force on the loop

*October 18, 2016*

**Physics **

If the pole-vaulter were to land on concrete rather than on a cushion, the impulse that stops the fall would be what? A) Greater because of the rigidity of the concrete. B) Greater because of the force of impact is greater. C) The same because impulse is the change in momentum...

*October 18, 2016*

**astronomy**

The isotope potassium-40 (40K) decays into the isotope argon-40 (40Ar) with a half-life of 1.25 billion years. Suppose we find a rock in which seven-eighths of the potassium-40 has decayed to become argon-40, and only one-eighth of the original potassium-40 remains.

*October 5, 2016*

**math**

figure (N) 1 , 2 , 3 Number of Square (S) 2 , 7 , 12 What is the formula?

*September 11, 2016*

**Math**

pattern Sort sticks Long sticks number (n) (S) (L) 1 4 2 2 7 4 3 10 6 find formula

*September 11, 2016*

**Math**

Simplest form for 2/3 times21

*September 8, 2016*

**Chemistry**

An unknown compound contains only C, H, and O. Combustion of 3.70 g of this compound produced 9.03 g of CO2 and 3.70 g of H2O. Im so confused.

*September 8, 2016*

**Kaplan **

Ricardo and Jessica are traveling towards each other from points that are 603 miles apart. If Jessica is traveling 9 mph faster than and they meet after 9 hours, how fast was each traveling?

*August 24, 2016*

**math**

7*1, 7*3, 7*9, 7*27, 7*81 looks like 7* 3^(x-1) I don't understand how you got (x-1) can you explain?

*June 17, 2016*

**math**

1. Examine the first four terms in each of the following number sequences: *2, 7, 12, 17 my formula x+5 *7, 21, 63, 189, 567 my formula x(2)+x *1000, 850, 700, 550 my formula x-150 * –10, –6, –2, 2 my formula x+4 For each sequence, what would be the 20th and ...

*June 17, 2016*

**Math**

Lesson is on using formulas A=l*w Create formulas for the following relationships. A. The relationship between the number of tires (not including spares) and the number of cars in a parking lot. B the relationship between the number of minutes to the number of days.

*June 15, 2016*

**Math**

Simplify 3(x+2)-4(5-x) Is this how you do it 3x+6-20+4x 7x-14 Is there a way to use a calculator for this

*June 14, 2016*

**Math**

Solve 2c+3t=35 for c

*June 14, 2016*

**Math**

Is there different ways to solve for 4x-5=9+2x

*June 14, 2016*

**math**

At the malt shop a large chocolate shake takes 8/9 of a pint of milk. If the medium shake takes 1/7 the amount of a large, how much does the medium shake take?

*June 9, 2016*

**Math**

Jason measured rainfall for a science project. Last week it rained 3 1/8 inches in all. This week it rained 1 7/8 inches in one day and 2 3/4 inches on another. How many more inches did it rain this week then last week? Please explain how you got your anwser

*June 6, 2016*

**Modeling our world**

In the Fall Semester, many high schools hold special events to welcome students back to school and to help the students new to the school get into the spirit of the new year. The Student Council decided to order spirit ribbons for all students to wear at a special assembly. ...

*June 2, 2016*

**Math**

In an used book store, there are some different mystery novels on a shelf. Suppose there are 64 different ways to buy these novels, including not buying them. How many mystery novels are there on the shelf?

*May 26, 2016*

**Math**

A committee of 5 people is to be formed from a group of 7 women and 4 men. How many possible committees can be formed if: the committee then must chose a president and a vice president, how many ways could these two positions be chosen? why is it permutations not combination? ...

*May 25, 2016*

**Math**

A circular window has a diameter of 25 inches. It's approximation is 22/7

*May 19, 2016*

**Math**

Gunny has a sheet of plywood that is 4 feet by 8 feet she wants to saw the plywood into pieces 1 foot high and 2 feet long for signs How many signs can she make with the sheet of plywood?

*May 1, 2016*

**Math Help **

Find the Area: f(x)=sin6x and g(x) = cos 12x, -pi/12 less than or euqal to x is less than or equal to pi/36

*April 29, 2016*

**math**

Find the area: f(x)=sin6x and g(x) = cos 12x, -pi/12 less than or euqal to x is less than or equal to pi/36

*April 28, 2016*

**Math**

Martin paid $120 towards his $2400 credit card bill. What percentage of his bill did he pay?

*April 27, 2016*

**Math**

If f[g(x)] = x, then f(x) and g(x) are inverses of each other. Why? I don't get this in my math question.

*April 23, 2016*

**Life Orientation**

for research

*April 22, 2016*

**life orientation**

bill of rights

*April 19, 2016*

**Math**

This is on the 2008 Free response AP Calc AB exam- #4a. Let f be the function given by f(x)=(lnx)(sinx). The figure above shows the graph of f for 0<=x<=2pi. The function g is defined by int{1,x} f(t)dt for 0<x<=2pi. a) find g(1). I don't get why it is equal to...

*April 12, 2016*

**Math about weight**

I tried it's very late. Subtract .8 and 3 lbs from 32 lbs. then divide it by 8 liters?😂

*April 11, 2016*

**Math **

If there is a hole exactly in the middle of a 15 foot walk and the hole is 2.3 feet wide how far are the edges of the hole from edges of wall?

*April 11, 2016*

**Math grade 7**

Chelsea has a hole exactly in the middle of her 15 foot long walk, right where the floor and the wall meet. If the hole is 2.3 feet wide, how far are the edges of the hole from the edges of the wall?

*April 11, 2016*

**Math Grade 7**

you want to put a place mat that is 11.5 inches long directly in the center of a table that is 40 inches long. How far is the place mat from either edge of the table?

*April 11, 2016*

**math**

prove that 2sinA + 1 / cosA+sin2A=secA

*April 6, 2016*

**English**

Any traditional marriage

*April 6, 2016*

**math**

why a negative -240?

*April 4, 2016*

**math**

This question was in a math competition on April 2nd. I could The answer given was 48853.00

*April 4, 2016*

**math**

Nick would like to purchase a vacation timeshare, but he can only afford a $350 monthly loan payment. He wants the loan to extend 20 years, and the annual interest rate is 6%. How much money will Nick need to borrow if he repays the loan at $350 per month over the 20-year ...

*April 4, 2016*

**Math**

Suppose that INT{pi to t} g(u)du= e^(cos(t)). Show that INT{0 to t}g(u)du= e^(cos(t))- e. I have no idea how to prove. Tried taking derivative of the result, but didn't think that would help with anything.

*April 1, 2016*

**Algebra**

For a nonsmoker, the biological half-life of theophylline is 8 hours. Find the amount of the drug retained in a nonsmoker's system 18 hours after taking a one-unit dose. (Round your answer to three decimal places.)

*March 27, 2016*

**Math**

There are 12 gum balls,(each a different color), in a bag. One of them is red. What is the probability of reaching into a bag without looking & selecting a color that is not red?

*March 12, 2016*

**Math**

How does [(512)^x * ln(2)]/ln(512) simplify into ((512)^x)/9??

*March 9, 2016*

**Calculus**

How to do this vertical slicing question: find the area under the curve for the function y=(2x+1)^2 of the interval -1<=x<=3. I am not sure how to do this, but it may involve breaking the integral up. How though?

*March 7, 2016*

**Calculus**

Integrate dx/(sqrt(x^2+16)). I have no idea how to start and which method to use. Thinking some sort of trig substitution? But it doesn't look like it. Step by step? Answer key says ln|x+ sqrt(x^2+16)|.

*March 5, 2016*

**Calc**

Integrate (x+4)/(x^2+5x-6). I got 2/7ln(x+6)+5/7ln(x-1). But wolfram says 2/7ln(x+6)+5/7ln(1-x). Why is it 1-x instead of x-1??

*March 4, 2016*

**Math**

Using FTC(fundamental theory of calculus) evaluate the derivative of: (definte integral- lower bound 0 and upper 2) ∫|2x-1|dx I have no idea how to do this, especially because the dx is on the same side of the equation. It is usually d/dx, but this is also on the other ...

*March 2, 2016*

**Physics**

A 4.70 nC point charge is placed at the centre of a hollow metal sphere that has an inner radius 4.70 cm and an outer radius 17.6 cm. The metal sphere itself is charged to 8.40 nC. a)What is the magnitude of the electric field at a distance of 1.60 cm from the centre? b)What ...

*February 25, 2016*

**Science**

I need the know how many squares of a grap, if 1/6"=3'. I need to make a floor plan.

*February 8, 2016*

**Algebra**

An auditorium seats 1500 people. Floor seats cost $15 and balcony seats cost $10. If the place is sold out and they make $2100 how many seats are on the floor and in the balcony?

*February 3, 2016*

**math**

Graph two equations to determine every real number whose square equals its cube. I am so confused!

*February 1, 2016*

**geography**

The lengths of two sides of a right triangle are 12 inches and 15 inches. What is the difference between the two possible lengths of the third side of the triangle? Round your answer to the nearest tenth.

*January 27, 2016*

**Chemistry**

Calculate the total mass of aluminum, with 90% purity, required to produce 448g of iron in the process Fe2O3 + 2 Al = Al2O3 + 2 Fe

*January 21, 2016*

**math**

prove 3cos theta - cos3theta = 2cos theta cos2theta + 4sin theta sin 2theta

*January 16, 2016*

**math**

jenny needs to make a total of 85 deliveries this week. so far she has delivered 34 of them. what percentage of her total deliveries has jenny completed? how do u figure this out please

*January 14, 2016*

**math**

how do i figure out the percent increase from 0.c0 cents to 0.25 cents?

*January 14, 2016*

**math**

For his exercise today, Trey plans to both run and swim. let r be the number of laps he runs and let s be the number of laps he swims. each lap he runs takes him 5 minutes and each lap he swims takes him 2 minutes. he wants to exercise for more than 45 today. Write an inequality

*January 14, 2016*

**math**

Jenny needs to make a total of 85 deliveries this week.So far she has completed 34 of them. what percentage of her total deliveries Jenny has completed?

*January 14, 2016*

**math**

how do i translate: the sum of a number times 5 and 29 is at most 23 into an inequality sentence number

*January 14, 2016*

**Math**

Yes it is square root. I think I figured out the question now. Thanks!!

*December 16, 2015*

**Math**

Find an equation for the tangent to the curve y=1+ (sqrt2)(csc(X)) + cot(X). I just learned, though my teacher wasn't super good with explaining, derivatives for trig functions but they still aren't making too much sense. Could you please give me a step by step ...

*December 16, 2015*

**Mat 300/statistics**

In how many ways can a committee consisting of 2 faculty members and 3 students be for there are 11 faculty members and 14 students eligible to serve on the committee?

*November 25, 2015*

**Chemistry**

2.0 gram of C2H4 is reacted withO2. What mass of water is produced?

*November 16, 2015*

**Chemistry**

For the following chemical reaction, how many moles of lead(ii)iodide (PbI2) will be produced from 8 mol of potassium iodide (KI)?

*September 23, 2015*

**math**

P2+14p=

*September 13, 2015*

**math**

a bank loaned out 60000, part of it at the rate 14% per year and the rest at a rate of 8% per year. if the interest received was 6780, how much was loaned at 14%?

*September 13, 2015*

**Science**

How many parts listed make up a plant or animal cell nucleus?

*September 9, 2015*

**Science**

No.its not 42 its 3 only.

*September 9, 2015*

**Science**

How many parts listed make up a plant or animal cell nucleus?

*September 9, 2015*

**language arts**

A. Were lacking in basic necessities.

*August 28, 2015*

**Abnormal Psychology**

I have to create a timeline that displays the development of abnormal psychology. I have not been able to find any resources. I tried the link from the 2014 post and it no longer works. Can you please provide a location for me to go to?

*July 8, 2015*

**statistics**

12.(b) Subjective probability. 13. (a) classical probability. 14. (c) relative frequency approach

*June 30, 2015*

**Literacy 2**

“Filters” in Expanded Academic ASAP?

*June 19, 2015*

**Stats**

Find the probability that a sample of 12 has a sample mean below 31. the population mean is 26 and the standard deviation is 10

*June 11, 2015*

**Stats**

Find the score that separates the top 75% from the bottom 25% if the Mean is 100 and the Standard deviation is 15

*June 11, 2015*

**Stats**

Use the normal distribution to approximate the following Binomial probability. A product is manufactured in batches of 100 and a defect rate of 8%. Find the probability of more then 7 defects.

*June 11, 2015*

**math**

Tyson talked in 150 customer on his shift yesterday. Of those, 20% resulted in a successful upsell of additional purchased. If Tyson makes a $ 6.00 commission on top of the regular salary of each successful upsell that he make. how much commission did he make yesterday?

*June 3, 2015*

**Trigonometry**

In a parking garage, there are 20 feet between each level. Each ramp to a level is 130 feet long. Find the measure of the angle of elevation.

*May 31, 2015*

**Economics**

Assume that a local bank sells two services – checking accounts and ATM card services. Mr. Done That is willing to pay $8 a month for the bank to service his checking account, and $10 a month for unlimited use of his ATM card. Ms. Been There wants to pay only $5 for a ...

*May 2, 2015*

**math**

three triangles inscribed in a square. All tangents. What is the radius?

*April 14, 2015*

**Math(PLEASE HELP IMPORTANT CASE STUDY) **

Express the weekly profit earned using the variable cost per unit and the fixed cost. TP=TR-TC TP= P(9+33p-p^2)-10(9+33p-p^2)+100 Please help me solve this! I am BEGGING. THANK YOU SO MUCH

*April 10, 2015*

**Math**

amy said there are three cubic feet in a cubic yard explain why amy is incorrect

*March 26, 2015*

**Statistics - Can anybody help me?**

A Particular pain relieving medicine has a decay rate of 24% an hour. A patient was given a dose of the medicine 5 hours ago and there is currently 74mg of the medicine in the patients bloodstream. Q: What was the Origional dose of the medicine? ________ milligrams. Q How long...

*March 13, 2015*

**Statistics**

A Particular pain relieving medicine has a decay rate of 24% an hour. A patient was given a dose of the medicine 5 hours ago and there is currently 74mg of the medicine in the patients bloodstream. Q: What was the Origional dose of the medicine? ________ milligrams. Q How long...

*March 13, 2015*

**using skills**

Building and construction are excellent uses of the following skills:

*March 5, 2015*

**statistics**

Factories A, B and C produce computers. Factory A produces 3 times as many computers as factory C, and factory B produces 6 times as many computers as factory C. The probability that a computer produced by factory A is defective is 0.02, the probability that a computer ...

*February 22, 2015*

**Crime and Society**

Plea Bargaining, and Nixon's racist drug war.

*February 6, 2015*

**Physics**

Suppose that the amount of heat removed when 2.9 kg of water freezes at 0.0 oC were removed from ethyl alcohol at its freezing/melting point of -114.4 oC. How many kilograms of ethyl alcohol would freeze? I don't know where to start with this question! Please help.

*February 2, 2015*

**Science**

changes in the carbon cycle cause global temperatures to rise how might this affect the water cycle

*November 22, 2014*

**music**

1. In a major or minor scale, which scale degree is called tonic? A.first B.fifth C.sixth D.seventh

*November 18, 2014*

**Science**

A scientist is studying a plant species in which the flower color genes are codominant. The scientist crosses a plant with red flowers and a plant with white flowers. The offspring will most likely have A.red flowers B.white flowers C.pink flowers D.red flowers with white ...

*November 6, 2014*

**Math**

Chris has a square garden with an area of 38.a m squared. He decreases the length of each side by 1.7 m to make a smaller garden. What is the perimeter of the smaller garden. {Hint find the length of each side of the bigger garden first, then decrease the length, then find the...

*November 5, 2014*

**Business Ethics**

In the case of ADC Telecommunications in Mexico, Mario Dena, the vice president of manufacturing at ADC de Juarez, considered constructing an on-site childcare center and a water treatment facility. Which of Richard T. DE George's guidelines is illustrated in this example?

*October 29, 2014*

**algebra**

y^1/3(y^4/9-3y^2/9)

*October 23, 2014*

**chemistry**

a solution is made by mixing 38.0 ml of ethanol C2H6O, 62.0mL of water. assuming ideal behavior, what is the vapor pressure of the solution at 20 C

*October 10, 2014*

**word processing**

Which sentence uses a comma correctly? A. She wanted to be an astronaut, after finishing school. B. Thank you for returning my call, Mary. C. He would like to order the steak, and fries. D. Jim grabbed a bottle of ketchup, to go with his fries.

*September 26, 2014*

**accounting**

. Preference Decisions: NPV vs. IRR vs. Profitability Index Stephens Industries is contemplating four projects: Project P, Project Q, Project R, and Project S. The capital costs and estimated after- tax net cash flows of each project are shown in the table that follows. ...

*September 10, 2014*

**Grade 12 english**

I'm to compare I have a Dream speech with Mandela's Inauguration speech literary devices used in their speeches. I found the similarities of literary devices used for both speeches but I cant answer the differences of literary devices between the two speeches. Could ...

*August 29, 2014*

**finite Math**

how do I set up this problem, purchase a car today with inflation rate of 4% per year compounding annually for the next five years what would the cost of a $17,000 car be five years later

*June 20, 2014*