Sunday

February 14, 2016
Total # Posts: 385

**chemistry**

What is the pH of a buffer solution that has CH3CO2H=0.68 M and CH3CO2- =0.58 M, and has 0.01 M concentration of H2SO4 added to it? Ka of acetic acid is 1.8x10-5
*November 11, 2015*

**chemistry**

The solubility of Na3(PO4) is 0.025 M. What is the Ksp of sodium phosphate?
*November 11, 2015*

**chemistry**

What is the pH of a 0.5 M solution of NaHCO3? Kb = 2.4x10-8 (base)
*November 11, 2015*

**Geometry**

What is the pOH if the (OH-) is 1 x 10 -10 ? Please show your work? Plug the numbers into the formula
*September 24, 2015*

**Geometry**

How do you find the coordinates of the image of J (-7,-3) after the translation (x,y) (x-4,y+6)
*September 14, 2015*

**Physics**

I've read all my resource materials and looked for outside resources already and i can't find an equation for this. I would appreciate any help
*July 8, 2015*

**physics**

i figured it out, [v(initial)*time]+[[acceleration*time^2]/2]
*July 7, 2015*

**physics**

The angular speed of a rotor in a centrifuge increases from 428 to 1400 rad/s in a time of 6.26 s. (a) Obtain the angle through which the rotor turns. (b) What is the magnitude of the angular acceleration?
*July 7, 2015*

**Geomerty**

If the length of one side of a right triangle is known, the length of the other two sides with corresponding angles can be found. Answers: - only the hypotenuse can be found - this is not true -this is true only if the angles are given in radians What is the answer , please ...
*May 12, 2015*

**business**

A is wrong. Just took the exam.
*April 8, 2015*

**MATH**

what is the rule of the function table if the input is 1,8,5,10 and the output is 4,6,1,5
*February 23, 2015*

**math**

Set x as your adults y as your children 12 x + 9 y = 1410 pounds of food x+y = 148 2 equations 2 unknowns solve for y in second and put that into first equitation. 12x + 9(148-x) = 1410 3x + 1332 = 1410 x= 26 Adults, 148 - 26 = 122 childeren
*February 19, 2015*

**calculus**

When an oil well burns, sediment is carried up into the air by the flames and is eventually deposited on the ground. Less sediment is deposited further away from the well. Experimental evidence indicates that the density (in tons per square mile) at a distance r in any ...
*February 19, 2015*

**physics**

a boy of mass 40kg and a girl of 30kg play on a see saw of negligible weight.if the boy sits 270cm from the pivot of the see-saw where must the girl sit to make it balance
*February 8, 2015*

**Math**

Write whether the statement is true or false. If false write a true statement. 1. A right triangle has three right angles. False a right triangle has 1 right angle 2. A triangle that has three sides of the same length is an equilateral triangle. True because all sides are ...
*January 25, 2015*

**Math**

This is his father I don know the answers and are trying to figure them out
*January 24, 2015*

**Math**

True or false and if false write a true statement 1. A right triangle has three right angles. 2. A triangle that has three sides of the same length is an equilateral triangle. 3. An obtuse triangle has two angles that are acute. 4. In a right triangle the two angles that are ...
*January 24, 2015*

**Calculous FIX hopefully**

never mind forget how i put (-4,30) and and the (8,30) bit... Forget i said that. I just meant to say the highest endpoints you can see before the graph cuts off is those points
*December 5, 2014*

**Calculous**

g(x) = x^4-8x^3-16x^2+128x the graph goes through the x through (-4,0) , (0,0) (4,0), (8,0) horizontal axis has a scale of 2,4,6,8,10 (each tick increases by 2) Y-axis value that is the highest is (-4,30) and (8,30) Assume g(x) = k(x-p)(x-q)(x-r)(x-s) p<q<r<s I need ...
*December 5, 2014*

**Calculous Finding K, using zeros**

Suppose f(x) has zeros at x = -3, x = 3, x = 5, and a y-intercept of 17. In addition, f(x) has the following long-run behavior: as x -> +-infinity, y -> +infinity Find the formula for the polynomial f(x) which has the minimum possible degree F(x) = k(x+3)^2(x-3)(x-5) I ...
*December 5, 2014*

**PHI**

What is Larmer’s criticism of Duska’s argument? Loyalty is relative. Loyalty does not need to be reciprocal, it can still be directed at persons in the firm and not merely to the firm, an economic motive does not rule out a moral justification for whistleblowing. ...
*November 22, 2014*

**MATH**

Thanks for the help!!
*November 21, 2014*

**MATH**

Find the formulas for the functions f(g(x)) and g(f(x))when f(x) = 2/x and g(x) = 2x^2-1 f(g(x)) = ? g(f(x)) = ? for f(g(x)) would it be 2/x(2x^2-1) or g(f(x)) 2x^2(2/x)-1? Would i solve like this? also when I tried to input the answer after solving didn't get the answer. ...
*November 21, 2014*

**Math CHECK!**

5 / 1 -sin theta + 5/ 1 - sin theta the correct answer is 25 / cos^2 theta or 10 / cos^2 theta
*November 14, 2014*

**Math**

sec 7pi/4 without a calculator Find the exact answer
*November 7, 2014*

**PHI**

Which of the following does Peter Singer assert about the principle of equality? (Points : 1) People should have equal rights because they are factually equal. People with higher abilities, it stands to reason, should have greater rights. Different groups of humans should have...
*November 2, 2014*

**chemistry**

Isotonic saline is 0.89% NaCl (w/v). Suppose you wanted to make 1.0 L of isotonic solution of NH4Cl. What mass of NH4Cl would you need? Question 23 options: 1.6 g 8.1 g 8.9 g 54 g
*October 30, 2014*

**Math Trig**

A kite flier wondered how high her kite was flying. She used a protractor to measure an angle of 40 degrees from level ground to the kite string. If she used a full 120-yard spool of string, how high, in feet, was the kite? (Disregard the string sag and the height of the ...
*October 24, 2014*

**Trig calc**

thank you
*October 23, 2014*

**Trig calc**

A) P is approximately (0.883, 0.469), is a point on the unit circle with angle 28 degrees estimate the following. Sin 152 degrees = Cos 152 degrees =
*October 23, 2014*

**Trig / Calc**

What angle (in degrees) corresponds to 18.96 rotations around the unit circle? Enter the exact decimal answer.
*October 23, 2014*

**Pre-Calculous (Trig)**

The Singapore Flyer, currently the world's largest Ferris wheel, completes one rotation every 37 minutes.1 Measuring 150 m in diameter, the Flyer is set atop a terminal building, with a total height of 165 m from the ground to the top of the wheel. When viewed from Marina ...
*October 17, 2014*

**SAVE ME ( MATH)**

function p(t) has a domain of 1 less than or equal to t less than or equal to 12 range of -40 < p less than or equal to 160 Find the domain and range for. Enter the exact answers A) P(1/4t+4) B) -1/10p(2t)+46
*October 17, 2014*

**history**

African American labor assistance is the answer
*September 27, 2014*

**history**

Roosevelt addressed the struggles of industry with the National Industrial Recovery Act (NIRA). Which of the following was not one of the main components of this effort? African American labor assistance Public works projects National Recovery Administration Fair practice ...
*September 27, 2014*

**US History**

Heavy industry is the answer, More than 20,000 women served in the armed forces during the war, more than 5,000 of which were nurses stationed in France. While these women wore uniforms, they were not given military rank or privileges. They also served the military in ...
*September 27, 2014*

**US History**

Women made many contributions during World War I. Which area did they make the least impact? Nurses in the war Heavy industry Maintaining farms Truck drivers
*September 27, 2014*

**math**

How many thousands of people live in Boston ma.if population is 617,594
*September 17, 2014*

**math**

order the numbers from least to greatest. _ 1 4/5, 1.78, 1 5/6, 7/4, 1.7, 1 8/11 I am confused on going back and forth between decimals and fractions.
*September 11, 2014*

**statistics**

You can answer any questions from the questions on an exam. In how many different ways can you choose the questions, assuming that the order in which you choose the questions is irrelevant?
*August 6, 2014*

**Statistics**

Determine whether the following statements are true or false: 1. P(A and B)=P(B|A)P(B). 2. When A and B are independent, P(A)=P(B). 3. When A and B are independent, P(A|B)=P(A). 4. When A includes B, P(A|B)=1. 5. When B is the complement of A, P(A or B)=1. 6. When B is the ...
*May 22, 2014*

**Statistics/Probability**

Thank you!! And I also figured out the second one. APpreciate it!
*May 21, 2014*

**Statistics/Probability**

So I tried solving the first one and apparently failed miserably, attempted both twice and got it wrong each time and I have one submission attempt left, so any help is definitely appreciated! 1. Hotels R Us has kept the following recordes concerning the number of guests in a ...
*May 21, 2014*

**Statistics/Probability**

So I tried solving the first one and apparently failed miserably, attempted both twice and got it wrong each time and I have one submission attempt left, so any help is definitely appreciated! 1. Hotels R Us has kept the following recordes concerning the number of guests in a ...
*May 20, 2014*

**math**

Trail mix is sold in 1-pound bags. Mary will buy some trail mix and re-package it so that each of the 15 members of her hiking club gets one 25_ -pound bag. How many 1-pound bags of trail mix should Mary buy to have enough trail mix without leftovers?
*May 11, 2014*

**chemistry**

A sprinter set a high school record in track and field, running 200.0 m in 20.9s . What is the average speed of the sprinter in kilometers per hour
*September 8, 2013*

**Math130**

it decreased the first three years, then increased the next three years. so basically its like it remained the same
*September 8, 2013*

**chemistry**

While in Europe, if you drive 105km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 22.0mi/gal? Assume that 1euro = 1.26 dollars.
*September 8, 2013*

**chemistry**

The conversion factor relating miles to meters is 1 mile= 1610m The speed of light is 3.00×10^8 m/s. How fast is this in miles per hour (miles/h \rm miles/h)?
*September 8, 2013*

**Math**

Search Results for "Ruth has some money in a savings account. after the bank adds 5% interest to her account , she has $126. How much was in her account before the interest was added" How do i write this in an equation?
*September 3, 2013*

**math 160**

If the mean of a set of data is 20.00, and 12.20 has a z-score of –1.30, then the standard deviation must be
*June 10, 2013*

**math**

the length of marshalls rectangular poster is 2 times its width .if the perimeter is 24 inches what is the area of the poster?
*March 13, 2013*

**Statistics**

*Give all probabilities to two decimal places. Three daily newspapers are published in a large city. Suppose we have the following facts about the people in the city: 60% read Newspaper A. 34% read Newspaper C. 72% read Newspaper A or Newspaper B. 18% read Newspaper A and B. ...
*March 12, 2013*

**Statistics**

a) SS= {12,13,14,21,22,23,24,34,43} b) Selecting two even numbers SS= {22,24,42} P(getting 22) = (2/5)(1/4)= 0.1 P(getting 24) = (2/5)(1/4)= 0.1 P(getting 42) = (1/5)(2/4)= 0.1 P(getting 2 even number balls) = P(22)+P(24)+P(42)= 0.1+0.1+0.1= 0.3 c) The number on the second ...
*March 12, 2013*

**Statistics**

A box contains five numbered balls (1,2,2,3 and 4). We will randomly select two balls from the box (without replacement). (a) The outcome of interest is the number on each of the two balls we select. List the complete sample space of outcomes. (b) What is the probability of ...
*March 12, 2013*

**math**

Jared, you are correct. When you read a story to fit an answer always read the answer back to the story.
*March 10, 2013*

**Physics **

Multiple-Concept Example 13 presents useful background for this problem. The cheetah is one of the fastest accelerating animals, for it can go from rest to 34.7 m/s in 3.03 s. If its mass is 102 kg, determine the average power developed by the cheetah during the acceleration ...
*February 26, 2013*

**Physics **

In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 2.95 m/s. However, this speed is inadequate to compensate for the kinetic friction between the puck and the ice. As a result, the puck travels only one-half the distance between the ...
*February 26, 2013*

**Physics **

A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of 78 kg, and the height of the water slide is 12.5 m. If the kinetic frictional force does -5.4 × 103 J of...
*February 26, 2013*

**Physics **

A small lead ball, attached to a 1.50-m rope, is being whirled in a circle that lies in the vertical plane. The ball is whirled at a constant rate of three revolutions per second and is released on the upward part of the circular motion when it is 0.75 m above the ground. The ...
*February 26, 2013*

**Physics **

The drawing shows a skateboarder moving at 5.40 m/s along a horizontal section of a track that is slanted upward by 48.9 ° above the horizontal at its end, which is 0.582 m above the ground. When she leaves the track, she follows the characteristic path of projectile ...
*February 26, 2013*

**Physics **

A bicyclist rides 2.78 km due east, while the resistive force from the air has a magnitude of 6.52 N and points due west. The rider then turns around and rides 2.78 km due west, back to her starting point. The resistive force from the air on the return trip has a magnitude of ...
*February 26, 2013*

**Physics**

The concepts in this problem are similar to those in Multiple-Concept Example 4, except that the force doing the work in this problem is the tension in the cable. A rescue helicopter lifts a 72.4-kg person straight up by means of a cable. The person has an upward acceleration ...
*February 26, 2013*

**Physics**

A person pushes a 23.5-kg shopping cart at a constant velocity for a distance of 30.3 m on a flat horizontal surface. She pushes in a direction 31.5 ° below the horizontal. A 37.3-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force ...
*February 26, 2013*

**math**

a car weighing 15000N rounds a curve of 60m. radius banked at angle of 30 degrees.find the frictional force acting on the tires when the car is travelling at 100kph.The coefficient of friction between the tires and the road is 0.90.
*February 23, 2013*

**Physics**

Traveling at a speed of 15.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.640. What is the speed of the automobile after 1.45 s have elapsed? Ignore the effects of ...
*February 13, 2013*

**Physics**

A 4.51-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.382. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an ...
*February 13, 2013*

**Physics **

A rocket blasts off from rest and attains a speed of 30.4 m/s in 10.3 s. An astronaut has a mass of 60.1 kg. What is the astronaut's apparent weight during takeoff?
*February 13, 2013*

**Physics**

The sun is more massive than the moon, but the sun is farther from the earth. Which one exerts a greater gravitational force on a person standing on the earth? Give your answer by determining the ratio Fsun/Fmoon of the magnitudes of the gravitational forces. Use the data on ...
*February 13, 2013*

**Physics **

A space probe has two engines. Each generates the same amount of force when fired, and the directions of these forces can be independently adjusted. When the engines are fired simultaneously and each applies its force in the same direction, the probe, starting from rest, takes...
*February 13, 2013*

**Physics **

At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 940 m/s2 and the vertical or y component of its acceleration is 710 m/s2. The ball's mass is 0.35 kg. What is the ...
*February 13, 2013*

**Physics**

Two horizontal forces, F1-> and F2-> , are acting on a box, but only F1->is shown in the drawing. F2-> can point either to the right or to the left. The box moves only along the x axis. There is no friction between the box and the surface. Suppose that F1-> = +8...
*February 13, 2013*

**physics**

A tiger can run at approximately 100 km/hr (27.7 m/s) and a zebra at 80 km/hr (22.2 m/s). If both animals are running at full speed, with the zebra 70.0 m ahead, how long before the tiger catches its prey? a) 12.6 s b) 25.2 s c) 6.30 s d) 10.7 s
*February 13, 2013*

**math**

If pump A and pump B work together, they can fill a pool in 4 hours. Pump A, working alone, takes 6 hours to fill the pool. How long would it take pump B, working alone, to fill the pool?
*January 31, 2013*

**SCIENCE**

how do we derive the formula at=vf-vi if we will find acceleration? please have it step by step. Thank you
*January 15, 2013*

**Science**

Please complete the formula and process in arriving the answer. Please. Thank you. Nathaniel is driving his sports car down a four lane highway at 40m/s. He comes up behind a slow moving dumptruck and decides to pass it in the left hand lane. If Nathaniel can accelerate at 5m/...
*January 14, 2013*

**Science**

Nathaniel is driving his sports car down a four lane highway at 40m/s. He comes up behind a slow moving dumptruck and decides to pass it in the left hand lane. If Nathaniel can accelerate at 5m/s^2, how long will it take for him to reach the speed of 60m/s?
*January 14, 2013*

**Physics**

A dog is tugging forward on a leas held by a physics student who is standing still. The dog is tugging with a force of 63N. The student estimates the leash to be at an angle of 25 degrees above the ground. What is the tension in the leash?
*January 13, 2013*

**Math**

1) Solve equation 3r+5 _____ + 2 = 2r to find the value of r? 2 A. 2 1/7 B. 3 2/3 C. 15 D. 10 2) which is these is a rational number. A. Sq root of 14 B. -sq root of 9 C. -sq root of 34 D. Sq root of 72
*December 6, 2012*

**Math**

1) what is the length of the diagonal of a square whose sides are 3 inches long. A. 9 inches B. 3 square root 2 inches**** C. 6 inches D. 18 inches 2) which set of measure could be the side lengths of a right triangle? A. 0.9 cm, 1.2 cm, 1.5 cm B. 4 in, 4 in, 4 in C. 7 m, 8m, ...
*December 6, 2012*

**Algebra**

I am confused, why did you not count the page one? Can you explain?
*December 5, 2012*

**Algebra**

- There are less than 40 members of the Landowners Association. These memebers vote on various proposals. All the members were present at a meeting and all voted on each of two proposals. On the first proposal 4 times as many memebers voted yes to those who voted no, On the ...
*December 5, 2012*

**Algebra**

Thank you!!
*December 4, 2012*

**Algebra**

A car rental company charges $24 per day plus $0.75 per mile driven. a) Let C = total cost; D = number of days and M = number of miles b) Write the equation for the total cost in terms of C, D and M c) Use the equation to determine the total cost for a customer who rented the ...
*December 4, 2012*

**math**

how many terms are there on a 1/2 (a+b)? and are they monomial or binomial?
*November 27, 2012*

**Chemistry**

Unfortunately i knew the answer to the ones you posted,i just dont know how i can answer the heat capacity one..
*October 26, 2012*

**Chemistry**

Help with lab report Need Help finishing my lab report.KNOWN VALUES ARE V OF HCL=50ML,M=2.188.V OF NAOH=55.3ML,M=2.088.INTIAL TEMP FOR HCL=22.5C,NAOH IS 23C.this is for part A: Mass of final NACL solution assuming that the density of a 1 M Nacl solution is 1.04 g/ml? Heat ...
*October 26, 2012*

**ECON 4346**

4-The three fundamental economic questions of what, how, and for whom: a-exist because of scarcity. b-are much more serious in a socialist system. c-are not serious in a capitalistic system. d-are not relevant in the industrialized world of today. 5-When the market price is ...
*September 19, 2012*

**math**

evaluate the following expression _(5)P_0=
*August 28, 2012*

**Math**

how do you prove the quadratic equation?
*July 13, 2012*

**algebra**

AKI'S bicycyle designs has determined that when x hundreds bicycles are built the average cost per bike is given C(x)=0.1x^2-1.4x+10.766. Where C(x)is in hundreds of dollars. How many bicycles should the shop build to minimize the average cost per bicycle. The shop should ...
*July 6, 2012*

**algebra**

can someone help solve square root problem. 3+(z-13 - (z+2 help plz.
*June 20, 2012*

**algesebra**

Darla is buildig a new desk. To make sure she made a square corner, she measures 3ft. from the corner along one edge and 4ft. from the corner along the other edge. How long should the diagonal be between those two points if the corner is a right angle? round to nearest ...
*June 18, 2012*

**Homework test **

An artifact was found and tested for its carbon-14 content. If 70% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.
*June 17, 2012*

**math**

A pie plate has a diameter of 22 cm. How much counter space is needed to display 8 pies?
*June 15, 2012*

**algebra**

can someone plz show the steps to solving equation. i believe the answer is 36. (6^5)/(6^3)
*June 13, 2012*

**Math**

Suppose the modified quota is 6.47. Fill in the blanks, and round your answers to two decimal places. (a) Find the lower quota. (b) Find the upper quota. (c) Find the arithmetic mean of the lower and upper quotas. (d) Find the geometric mean of the lower and upper quotas. (e) ...
*June 12, 2012*

**algebra**

multiply and simplify by factoring. Assume that all expressions under the radicals represent nonnegative numbers. ^4 sq. rt. (810x^8y10)= show steps if possible.
*June 10, 2012*

**algebra**

sqrt(10a) + 5 sq. rt. (250a^2) add and sinplify
*June 9, 2012*

**algebra**

radicals multiply and simplify by factoring ____ ______ ^3|y^7* ^3|16y^8 unsure how to do root square sign.
*June 8, 2012*