Sunday

February 26, 2017
Total # Posts: 122

**Statistics**

In group of three friends what is the probability that at least two have the same birthday?

*January 26, 2017*

**Economics**

Suppose that there are 1,000 hot-pretzel stands operating in Toronto. Each stand has the usual U-shaped average total cost curve. Both the market demand curve and the supply curve for pretzels are linear, and the market for pretzels is in long-run competitive equilibrium. a) ...

*December 4, 2016*

**math**

``My hundreds digit is 4 less than my tens digit. my ten thousands digit is 6 greater than my hundreds digit. my thousand digit is 5 less than my ten thousand digit and my ones digit is 6 greater than my hundred digit. if my tens digit is 7, what number am i ?''.

*July 8, 2016*

**math**

A toy rocket is launched straight up into the air with an initial velocity of 60 ft/s from a table 3 ft above the ground. If acceleration due to gravity is –16 ft/s2, approximately how many seconds after the launch will the toy rocket reach the ground?

*June 7, 2016*

**6th grade math**

incorect it should be 1/3 because it has "greater than 3"

*May 14, 2016*

**Math**

Thank u very much, I was also confused cause I didn't understand why we needed complex numbers :)

*February 15, 2016*

**Math**

x^2+√2x+1/2=0 Solve using the quadratic formula and use complex numbers.

*February 15, 2016*

**Algebra**

I would use the first way and then subtract ur like terms and simplify, if u want u can give it a try and I can check your work

*February 10, 2016*

**Science**

Ok thanks :)

*February 10, 2016*

**Science**

Is there anything else I could included?

*February 10, 2016*

**Science**

what is the importance of ph to biological systems in the human body? I have an answer but is there anything else I could include and is my answer justified? My answer: Changes in the ph could be harmful, Natural buffers prevent rapid or large changes in the pH of living ...

*February 10, 2016*

**math help please**

You should graph your points first and then use your translations. When you reflect on the y axis, u Multiply your x values by -1 (check to make sure) and then once you have competed that simply move your points left 3 units and down 6 units and then you will have your new ...

*February 10, 2016*

**Physics**

Vf^2=Vi^2+2ad Vf^2=0^2+2(9.8)(1.25) 4.94974

*January 25, 2016*

**Math**

please help fast guys.

*October 29, 2014*

**Math**

Dominick is in charge of ordering supplies for harry's hamburger stand. hamburger buns come in packs of 12 and frozen hamburger patties come in packages of 20. he must have the same amount of rolls as patties. What is the least number of packages of each that he must order?

*October 29, 2014*

**Math help algebra**

It is D

*September 29, 2014*

**Calculus II**

find the distance between the given parallel planes 5x-5y+z=10 and 10x-10y+2z=2. I got 9sqrt51/51

*September 11, 2014*

**algebra**

Thank you!

*August 21, 2014*

**algebra**

Additive inverse integer of -13

*August 21, 2014*

**physics**

A) F = 0.0016YA, F= 1600N B) Delta L = FL/AY, Delta L = 0.0064 m or 6.4 mm C) F = 0.0065YA, F = 6500N ----------------------------------------- Just did this problem and it's correct, I got'chu.

*April 8, 2014*

**Chemistry**

The mass of a sample of boron atoms is 5.60 g. How many boron atoms are in this sample? Show work, and explain.

*December 18, 2013*

**grammar**

What is the complete subject if the following sentenc:some people like to take classes to learn new things

*October 8, 2013*

**economics**

Explain three ways the workplace in the US has changed since the 50s.

*May 20, 2013*

**economics**

A producer would have an added incentive to enter a market if the: A. prices for microwave oven sharply decreased. B. price for tennis shoes sharply increased C. supply of apples increased, causing a surplus D. supply of cell phones satisfied consumer demand (I think it's ...

*May 20, 2013*

**economics**

i'd go with D.

*May 20, 2013*

**economics**

Which is most likely to have an inelastic demand? A. an expensive sports car B. experimental cosmetic surgery C. organic fruits and vegetables D. an effective cancer-fighting drug

*May 20, 2013*

**investing**

A company is thinking of investing some surplus cash in 30 year $1000 face value Microsoft 6% annual coupon bonds. It plans to pay $925 each for 10,000 of them, now, and expects to SELL them for $1025 each at the end of 5 years. Make a determination about the economic ...

*February 2, 2013*

**chemistry**

what is the molarity of the solution obtained by mixing 25.0 ml of a 3.00 M methyl alcohol solution with 225.0 ml of a 0.100 M methyl alcohol solution?

*December 13, 2012*

**math**

12 bows

*December 13, 2012*

**Algebra**

In the following problem, the digits 0-9 have been replaced with letters. Can you reconstruct the original multiplication problem by identifying what digit each letter represents? TEA (times)x_TEA_ SEA TNNA (add)t_TEA_ (ans.) CHINA

*November 28, 2012*

**Algebra**

Find the equation of the line and write your answer in the slope-intercept form. 1. Has a y-intercept of 5 and a slope of 2. Has a slope of -5 and a y-intercept of 2/3. 3. Has a slope of -3 and contains (4,9). 4. Has a slope of 4/9 and contains (0,-2) 5. Contains the points (4...

*November 28, 2012*

**Algebra**

The perimeter of Greg's rectangular deck is 170 feet. The length of the deck is four times the width. What is the dimensions of the deck?

*November 28, 2012*

**Chemistry**

In an experiment, 0.0300 moles each of SO3(g), S02(g), and O2(g) were placed in a 10.0L flask at a certain temperature. When the reaction came to equilibrium, the cocentration of SO2(g) in the flask was 3.50x10^-5 molar. What is Kc for the reaction? 2SO2(g) + O2(g) <--> ...

*November 19, 2012*

**physics**

Suppose we attempt to account for air resistance in our projectile motion in the following (incorrect) way: we alter g so that the acceleration in the y direction is -8 m/s2, and introduce a horizontal acceleration of -3 m/s2. With these changes, find the landing point of a ...

*September 2, 2012*

**physics**

A projectile is shot at 35° to the horizontal and lands 12 s later at the same elevation. (a) What is the projectile's initial speed? (b) What is its maximum altitude?

*September 2, 2012*

**Alg**

solve: x + 8 = 2(x-2) - x

*August 31, 2012*

**Calculus**

The figure is an invertible function . Use the figure to find the following: ƒ−1(-3)= ƒ−1(-2)= ƒ−1(-1)=

*August 28, 2012*

**physics**

The vector V is given by V = (5.0x-12.0y )m. What is W such that V + W = -5|V|x?

*August 26, 2012*

**physics**

The acceleration of a certain particle is a function of time: a(t) = pt^2-qt^3, where p and q are constants. Initially, the velocity and position of the particle are zero. (a) What is the velocity as a function of time? (b) What is the position as a function of time?

*August 23, 2012*

**physics**

A ball is thrown upward in such a way that its speed is 32.3 m/s when it is at half its maximum height. Find (a) its maximum height, (b) its velocity 2.0 s after it's thrown, (c) its height 2.0 s after it's thrown, and (d) its acceleration at its maximum height. Please...

*August 23, 2012*

**physics**

An asteroid moves toward the sun along a straight line with a velocity given by v = -(c1+c2/x)½ , where x is the distance from the center of the sun. Use the chain rule for derivatives to show that the asteroid's acceleration is a = -c2 /2x^2.

*August 23, 2012*

**physics**

A particle moves along the y axis according to y(t)=(3.5 m/s^2)t^2 - (9.0 m/s)t + 5.0 m. (a) What is the particle's velocity as a function of time? (b) What is the particle's acceleration at t=2.0 s?

*August 23, 2012*

**physics**

An object has an acceleration of +1.4 m/s2. At t=4.0 s, its velocity is -4.5 m/s. a) Find the object's velocities at t=1.0 s and t=7.0 s.

*August 23, 2012*

**algebra**

What is the value for the coefficient determinant (D) in the following system? 4x – 3y = 16 3x + 7y = –25 A. –37 B. –19 C. 37 D. 52

*July 22, 2012*

**math**

The price of a shirt is reduced by 30% to $14. What was the original price of the shirt?

*July 19, 2012*

**math**

Verify cos(x-3pi/2)=-sin x

*May 29, 2012*

**Math**

Find the formula for piecewise function f(x) = ____ if x < or equal to -1 ____ if -1 < x < or equal to 2 ____ if x > 2 Thanks! I got -1, x, and 2. Am I right?

*April 4, 2012*

**Chemistry**

Would PV=nRT apply to this? if so, how do I find "n"?

*March 24, 2012*

**Chemistry**

what volume of oxygen gas measured at 25C and 760 torr is required to react with 1.0L of methane measured under the same conditions of temperature and pressure?

*March 24, 2012*

**BUSINESS**

1. Which one of the following is not a benefit to the employer when offering an ESOP? (Points : 1) maintains a stable work force owner can sell stock to a friend results in a dilution of value of the stock ESOT can borrow money under favorable conditions 2. All but which one ...

*March 19, 2012*

**linguistics**

why is there a length difference between the word "house" in 'greenhouse' and 'green house' when you say the word? I know it takes longer to say 'house' in "green house" but why does it take longer? please help me. I am so confused :(

*March 12, 2012*

**algebra**

Average cost of a bicycle is modeled by the function c(x)=.1x^2-1.7x+10 where c(x) is measured in dollars. how many bicycles should be built in order to minimize the average cost per bicycle?

*November 16, 2011*

**calculus**

If X = 15, Y = 20, and Z = 25, what is the sine of angle B?

*October 13, 2011*

**math word problm**

WHAT IS THE TENTH DIDGIT IN THE QUOTIENT 120 / 11? A. 0 B. 1 C. 8 D.9 I CHOOSE 9 THATS WHAT I GOT IN LONG DIVISION. THE TEMPERATURE ON mARS REACHES 27DEGREE CELSIUIS DURING THE DAY AND -125 DEGREE CELSIUS AT NIGHT. WHAT IS THE AVERGE TEMPERATURE? NOT SURE HOW TO DO THIS? 27 - ...

*October 6, 2011*

**math questions**

OK SO 1ST ONE IS 99 I Still don't understand how its +3 difference? can you explain?

*October 6, 2011*

**math questions**

for no 1) I'm confused the data is: 86 96 88 91 which = 361 with a test score of 99 added in its; 86 96 88 91 and 99 = 460 /5 = 92% and i don't understand how you get 3 meters i got -3 meters -2-1= -2 + -1 = -3

*October 6, 2011*

**math questions**

WORD PROBLEM: Tims tet grades in french were: 86,96,88,91 what score must Tim make on his next test to average 92? a 89 b 93 c 97 d 99 I said 99. because when you add all numbers its 460/5 = 92 2) the water level indicator measures the rise and fall in meters of the water ...

*October 6, 2011*

**math**

word problem: The Rory family drove 310 miles each day for 4 days. Then on Friday they drove 250 miles to Centerville. On Saturday they drove 150 miles to Westfield. What else do you need to know to determine how many miles they averaged each day for that one week? a) number ...

*October 6, 2011*

**MATH BOB PURSLEY**

Can you check if I have right now?

*October 6, 2011*

**MATH**

WAS THE TENTH DIGIT 9 CORRECT IN FIRST QUESTION? FOR 2ND QUESTION AVERAGE TEMPERATURE I GOT 27 + -125 = -76 FOR LAST ONE: -3 - (-9) = +6 SO THE ANSWER WOULD BE : C 1 ONLY IS TRUE -- IS THAT CORRECT NOW? FO

*October 6, 2011*

**MATH**

WHAT IS THE TENTH DIDGIT IN THE QUOTIENT 120 / 11? A. 0 B. 1 C. 8 D.9 I CHOOSE 9 THATS WHAT I GOT IN LONG DIVISION. THE TEMPERATURE ON mARS REACHES 27DEGREE CELSIUIS DURING THE DAY AND -125 DEGREE CELSIUS AT NIGHT. WHAT IS THE AVERGE TEMPERATURE? NOT SURE HOW TO DO THIS? 27 - ...

*October 6, 2011*

**Math (Urgent)**

Use the Midpoint Rule to approximate the integral (–10x+7x^2) from 10 to 17 with n=3

*June 29, 2011*

**biology**

What is a possible system that can be used to test respiration in a small animal?

*June 16, 2011*

**Statistics**

Suppose that 92% of all SFSU students own a cell phone. Find the probability that 7 out of 10 random selected SFSU students own a cell phone. explain how answer was arrived

*February 24, 2011*

**Statistics**

Suppose that 92% of all SFSU students own a cell phone. Find the probability that 7 out of 10 random selected SFSU students own a cell phone

*February 24, 2011*

**Maths**

Perimeter = 216 and the length is (2X)+3 more than the width. How do I solve for X and what is the rectangle length. I am really stuck!

*February 3, 2011*

**math 4th grade**

n divided by 5 equals 105 how do you no that the tens place in n is less than 5

*January 19, 2011*

**Physics**

its a triangle on a table with an unknown angle. the two masses are connected by a string.

*December 10, 2010*

**Physics**

An inclined plane is on a table 1.4m tall. A 6kg box is hanging vertically attached to a 2kg mass on a plane with an unknown incline plane with coefficient of sliding friction of .2 . a. determine the acceleration of the system. b. if the plane is 3.5m long and the blacks ...

*December 10, 2010*

**math**

tree casts a shadow 32 feet on the ground. If the distance from the end of the shadow to the top of the tree is 40 feet, how tall is the tree?

*November 8, 2010*

**Biology**

Chemical bond formation

*October 22, 2010*

**physics**

really stuck, a 90 kg skier has 140 KJ of total mechanical energy when he is at a height of 120m above the bottom of the hill. calculate the skiers kinetic energy. calculate his speed?

*October 18, 2010*

**math**

rounded to the nearest ten i am 780. i am even.the sum of my digits is 17.

*September 20, 2010*

**physics**

What is the required resistance of an immersion heater that will melt 6.39 kg of ice at 0°C in 36 min while operating at 110 V? im not too sure how to do this because delta_T=0. With the equations im using, i get 0 but its not the answer and im not quite sure what to do. ...

*May 19, 2010*

**AP history**

Decade charts - teacher looking for Prospects - what would that mean

*May 5, 2010*

**Chemistry**

Suppose a compound is involved in three different reactions denoted R1, R2, and R3. Tripling the concentration of this reactant in all three reactions causes the rates of reaction to increase by factors of 3, 9, and 1, respec- tively. What is the order of each reaction with ...

*May 1, 2010*

**physics**

ok so dr= 2i + 3j while F= 5i + 2j It wants me to find the work. now i know w=Fxdr. what i want to know is why when you take the dot product of both, you get a different answer compared to when you just multiply the magnitudes.

*March 6, 2010*

**Chem**

1.049 and .9982 respectively.

*March 3, 2010*

**Chem**

Calculate the volume ( mL ) of the solute acetic acid and the volume ( L ) of the solvent H2O that should be added to generate 5.01 kg of a solution that is 0.694 m acetic acid. volume ( mL ) of the CH3CO2H volume ( L ) of the H2O i just want to check my answers...its either i...

*March 3, 2010*

**earth**

Could you tell a story of the rock cycle using a rock called Roger the Rock??

*February 23, 2010*

**algebra**

give an example of a number that is a integer, but not a whole number

*January 27, 2010*

**math**

I am trying to prove the formula..

*December 18, 2009*

**math**

Wow that did not work... Prove (dphi/ds) = ( xprime*ydouble prime - xdoubleprime*yprime ) / (vector V)^3

*December 18, 2009*

**math**

I understand that much, but I still cannot derive the curvation equation.. a.Let x prime and x double prime be the first derivative and second derivatives of x with respect to t, and similarly for y. Show the following in true. dƒ³/ds = ( xŒ yŒ...

*December 18, 2009*

**math**

These questions relate to curvature problems. a.Explain why (dÖ/ds) = (dÖ/dt) (dt/ds). b.Explain why tanÖ = dy/dx, which equals (dy/dt) / (dx/dt).

*December 18, 2009*

**Geometry**

Dodecagon

*November 22, 2009*

**Math**

(Growth of Cells) Suppose that after t hrs, there are p (t) cells present in a culture, where P(t) = 5000e*^2t a) How many cells were present initially? b) Give a differential equation satisfied by P(t) c) When will the population double? d) When will 20,000 cells be present?

*June 29, 2009*

**Algebra 1**

Duh!! Twenty minutes too.

*April 16, 2009*

**Algebra**

Find the slope of the line that goes through the given points. I think I figured out the answer but I would appreciate any feedback thanks! (3,-2),(-1,-6)

*February 24, 2009*

**Algebra**

I need 3 ordered pairs of points that would be solutions to this equation I have an idea of what suppose to fit because I think this equation has infinate solutions. What do you all think. Thank you! 4x - y = 7

*February 18, 2009*

**chemistry**

We did an experiment on Quantitative Analysis of Soda ash by Double-Indicator Titration. What is the cause of carbonate error and its effect on the calculated values obtained in standardizatin and sample analysis?

*January 18, 2009*

**physics**

No, not average displacement, "angular displacement". We used a spectrometer in this experiment. We were always checking if the grating was aligned. What happens to the ANGULAR displacement and the wavelength reading when the grating isn't aligned?

*January 18, 2009*

**statistic**

Given TWO SETS of congruent angles, what is the probability of selecting two consecutive angles that are congruent?

*December 3, 2008*

**math**

use only 10s to make the number 40 in two parts (5 ways) 1+3 2+2 3+1 what are the other two?

*October 27, 2008*

**math**

use only tens to make the number 40 in two parts (5 ways)

*October 27, 2008*

**math**

How would you solve for x in this equation: (y^2+y-6)(3y+1)=0

*September 15, 2008*

**math**

How would you solve for x in this equation: (x^2-9)(2x-1)=0

*September 15, 2008*

**biology**

how do nonliving thing grow

*September 8, 2008*

**Science**

does wiping your perspiration increase the rate at which you perspire?

*June 30, 2008*