Sunday

October 4, 2015
Total # Posts: 222

**Sicience**

Calculate the density of a liquid that has a mass of 20g and a volume of 315.4ml
*September 13, 2015*

**statistics**

If I am using a venn diagram, the probability that event A occurs or event B occurs but not both. What is my formula? I am soooo very confused..
*July 7, 2015*

**statistics**

Joe owns a clothing store, he keeps 15% of the shirts on display in the window. he knows if a shirt is in the window there is a 70% chance of it being sold that week. The probability that the shirt in the display window will be sold within the week is????? and is this an ...
*July 7, 2015*

**statistics**

the probability of NOT drawing either a club or a queen from a standard deck of 52 cards is???
*July 5, 2015*

**statistics**

How do I find the probability of an event A occurring or an event B occurring but not both? How do find this equation with a Venn diagram?
*June 30, 2015*

**statistics**

Jesse took two data points from the weight and feed cost data set and calculated a slope, or average rate of change. A rat weighs 3.5 pounds and costs $4.50 per week to feed, while a Beagle weighs 30 pounds and costs $9.20 per week to feed. Using weight as the explanatory ...
*June 24, 2015*

**statistics**

Jesse put the heartbeat and lifespan data into a statistical software program and found the coefficient of determination to be 64%. The value of the correlation coefficient is __________.
*June 24, 2015*

**statistics**

Using the regression equation ŷ = .3 + .12x, the predicted weekly food cost for a hedgehog weighing 1.3 pounds is __________.
*June 24, 2015*

**Goverment **

the president can choose to rid of democracy a. true b. false
*June 16, 2015*

**statistics**

In blackjack with one card dealt already? What is the probability it is a Ace, given that it is not a face card?
*June 9, 2015*

**statistics**

How did you get that answer?
*June 8, 2015*

**statistics**

If there were fifteen cards left in the deck, and five were diamonds, what is the probability that two cards dealt (without replacement) would both be diamonds?
*June 8, 2015*

**algebra**

Simplify -14x^3/x^3 - 5x^4 it too hard for me to understand
*May 19, 2015*

**math**

dave throws loose change in to a cup an takes it out every 2 weeks this time it is all nickels and dimes there are 7 times as many dimes as nickels and the value of dimes is $5.85 more than the value of the nickels how many nickels and dimes does dave have
*April 29, 2015*

**math**

The length of a rectangular piece of cardboard is three more than twice the width. A square 2 cm on a side is cut out of each corner. The sides are folded up to form an open box. if the volume of the box is 120cm^3, what were the original dimensions of the cardboard.
*April 25, 2015*

**math**

the width of a math textbook is 0.75 inches. how many math textbooks can be placed standing up on a shelf that is 18 inches wide
*April 11, 2015*

**Calculus**

Find the general solution of the DE. Write your solution explicitly. y'=(y^(2)+y^(2)cosx)^2
*March 5, 2015*

**math**

Sam purchased 625 square feet of carpet for his bedroom, which is shaped as a square. What are the dimensions of his bedroom? Each side of the bedroom has a length of 25 feet. Each side of the bedroom has a length of 156.25 feet. Each side of the bedroom has a length of 390,...
*February 22, 2015*

**Math**

Find the slope of the line L1 given that L1 is perpendicular to L2 and L2 passes through (-3,-1) and (-5,7). How do you do this kind of problem
*February 21, 2015*

**math**

Cecily Made a poster in the shape of a quadrilateral. All the angles and sides of the poster are congruent. Which of the following names the shape of Cecily's poster Square (a) rectangle (b) pentagon (C) trapezoid (D)
*February 20, 2015*

**LA**

which of the following best relates to these details in "winter"? frogs burrow the mud/ snails bury themselves
*February 13, 2015*

**Science**

The Ka for the H2PO4–/HPO42– buffer is given by the equation: Ka= ([HPO4^-2]gamma [H^+])/[H2PO4^-]=10^-7.20 What is the pH of a 2:3 mixture of H2PO4– to HPO42– at 0.10 M ionic strength? (See the table for the activity coefficients.) I just am not sure how ...
*December 3, 2014*

**writing**

it isn't C.
*June 26, 2014*

**Math**

Mr. Jefferson has 20 students in his class. He wants to send 4 of these students to pick up books for the class. How many combinations of 4 students can he choose? A)5 B)80 C)4845 D)116,280
*May 23, 2014*

**Physics**

A 0.15kg baseball pitched at 30 m/s is hit on a horizontal line drive straight back at the pitcher at 46.0 m/s. If the contact time between bat and ball is 5x10^-3 s, calculate the force (assumed to be constant) between the ball and bat. [Hint: impulse!] I did FΔt = Δ...
*May 18, 2014*

**Consumers Math**

I don't want the answer to this question, but if someone could please tell me how to work it out, that would be great and I could finish it on my own. Thank you very much:) Question- Your station charges $15.95 for an oil change. As a promotion you sell six coupons for oil...
*May 12, 2014*

**world history**

Its about 1569 map Of the World Compare a modern Mercator Projection of eastern North America with Mercator's map. How are the two maps different? How are they similar?
*March 12, 2014*

**College Chemistry**

calculate the initial concentration of SCN- ions and Fe3+ ions when a solution was prepared by mixing 3.00mL of 0.00280M KSCN, 6.00 mL of 0.250M Fe(NO3)3 and 16ml of 0.050M HNO3.
*February 10, 2014*

**physics**

A) A hot air balloon has just lifted off and is rising at the constant rate of 1.70 m/s. Suddenly, one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 10.4 m/s. If the passenger is 3....
*January 25, 2014*

**physics**

a)Two cars are traveling along a straight line in the same direction, the lead car at 24.5m/s and the other car at 29.6m/s. At the moment the cars are 41.6m apart, the lead driver applies the brakes, causing her car to have an acceleration of -2.00m/s2. How long does it take ...
*January 23, 2014*

**physics**

A model rocket is launched straight upward with an initial speed of 47.7 m/s. It accelerates with a constant upward acceleration of 2.02 m/s2 until its engines stop at an altitude of 157 m. What is the maximum height reached by the rocket? How long after lift off does the ...
*January 23, 2014*

**math**

Look at your numerator,if it is 55 than can 55 go into 80, if so how many times, 50 cant go into 80 and 80 cant go into 50 so theres your answer
*December 2, 2013*

**Calculus**

Can some one please explain this problem to me? Find lim x->0 (sin5x/sin7x)
*September 30, 2013*

**science**

Compare and contrast the reproduction of mosses, ferns, gymnosperms, and angiosperms
*September 13, 2013*

**science**

why is sexual reproduction better than a sexual reproduction for ensuring the survival of a species in a changing environment?
*September 13, 2013*

**Statistics**

1 a 2a 3a 4a 5a 6a 7a 8a 9a 10a
*August 26, 2013*

**physics**

Using a small pendulum of length 0.171 m, a geophysicist observes that it completes 1 cycle every 0.833 s. What is the value of g at his location?
*July 29, 2013*

**Chemistry**

At 25C only .0190 mol of the generic salt AB2 is soluble in 1.00L of water. What is the Ksp of the salt at 25C? AB2<->A^2+ + 2B^- I took the .0190 mol and doubled it and multiplied by .019 again and got 6.859x10^-6 and got it wrong what should I do? Please help Dr. Bob
*July 20, 2013*

**Chemistry**

The hint says the acid and base will react completely until one or both is completely used up.
*July 16, 2013*

**Chemistry**

Complete this table of initial and final concentrations HF(aq) + KOH(aq) <-> KF(aq) + H20(l) Initial concentrations: HF-2.0M KOH-1.0M KF-0M Final Concentrations? how do I set this up to figure out the final concentrations? How can I tell which of the following best ...
*July 16, 2013*

**Chemistry**

The correct pH is 3.17
*July 13, 2013*

**Physics**

a person jumps from a ledge 3.7 meters and when he drops to the ground it takes .7 meters for him to stop what is the force applied to his body . A person (46kg) UPDATED****
*June 30, 2013*

**Physics**

a person jumps from a ledge 3.7 meters and when he drops to the ground it takes .7 meters for him to stop what is the force applied to his body
*June 30, 2013*

**Chemistry **

How would you prepare 50.0 mL of 2.0 M H2SO4 starting with concentrated sulfuric acid (18M)?
*June 28, 2013*

**Chemistry **

How would you prepare 50.0 mL of 2.0 M H2SO4 starting with concentrated sulfuric acid (18M)?
*June 28, 2013*

**pre calculus**

We are supposed to graph the equation then we are supposed to find the extreme values. I tried graphing it and I tried finding the extreme values. I came up with the max 5 and the min are -9 and -2. I am not sure if they are right because I watched a video online and didn'...
*June 16, 2013*

**pre calculus**

Hi, I am having a problem trying to find and understanding how to find the extreme values. I have a problem which I can't do. Will someone please explain for me how to do it. I would like to be able to do other similar problems. This is the problem I am stuck on: f(x)= x^...
*June 16, 2013*

**pre calculus**

Hi, I am having a problem trying to find and understanding how to find the extreme values. I have a problem which I can't do. Will someone please explain for me how to do it. I would like to be able to do other similar problems. This is the problem I am stuck on: f(x)= x^...
*June 16, 2013*

**physics**

An aircraft in straight and level flight is in a state of horizontal equilibrium. It is flying 120 km/hr in the direction 110* and not correcting for wind. The wind is blowing at 60 km/hr in the direction 340*. Determine the speed and direction the aircraft will actually fly.
*June 6, 2013*

**Ap bio**

Triiodobenzoic acid (TIBA) inhibits auxin transport. If a tiny agar bead containing TIBA were placed off center on the tip of an intact coleoptile, which way would the coleoptile bend: toward the side of the bead or away from it?
*April 20, 2013*

**physics**

two forces f1 and f2 are acting at a point such that the angles between them are (1) 30 degree (2) 60 degree and (3) 45 degree show that resultant forces will be
*March 23, 2013*

**physics**

two forces f1 and f2 are acting at a point such that the angles between them are (1) 30 degree (2) 60 degree and (3) 45 degree show that resultant forces will be
*March 23, 2013*

**Physics**

Why is R1 equal to 1?
*January 29, 2013*

**Physics**

When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume that the star is a...
*January 29, 2013*

**Physics**

Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ...
*January 29, 2013*

**Physics**

I figured it out. 2mg=mv3^2/r-mv1^2/r V3 being the speed at the top and V1 being the speed given at the bottom set them equal: V3^2=2gr+V1^2 sqrt(2*9.8*4.84+16.6^2) V3= 19.2459 m/s
*January 23, 2013*

**Physics**

It is located on the top
*January 23, 2013*

**Physics**

How do I attach photos?
*January 23, 2013*

**Physics**

For the normal force in the drawing to have the same magnitude at all points on the vertical track, the stunt driver must adjust the speed to be different at different points. Suppose, for example, that the track has a radius of 4.84 m and that the driver goes past point 1 at ...
*January 23, 2013*

**Physics**

The final equation to use is: W=(GmM)/r^2 m=mass of satelite M=mass of planet What is the equation to find the mass of the planet?
*January 23, 2013*

**Physics**

A satellite has a mass of 6146 kg and is in a circular orbit 4.57 × 105 m above the surface of a planet. The period of the orbit is 1.6 hours. The radius of the planet is 4.44 × 106 m. What would be the true weight of the satellite if it were at rest on the planet...
*January 23, 2013*

**Math**

On a Christmas package, Audrey needs to use only 40-cent stamps and 16-cent stamps. If she uses twice as many 40-cent stamps as 16-cent stamps, how many of each type of stamp must she use to mail a package costing $5.76 in postage?
*January 18, 2013*

**college physics**

A 55-kg woman cheats on her diet and eats a 465-Calorie (465 kcal) jelly doughnut for breakfast. (c) If the human body is only 24% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work off her breakfast? I got 24075.32468 ...
*December 3, 2012*

**college physics**

An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27°C. A 400-g sample of silver at an initial temperature of 87°C is placed in the water. The stirrer is used to stir the mixture gently until it reaches its final equilibrium temperature of 32&...
*December 3, 2012*

**math**

at the bowling alley Angela rented shoes for $3.00. It cost her $2.50 to bowl each game. develop an equation using the form C(x)=mx+b, where C(x) is the total cost and x is the number of games bowled.
*November 28, 2012*

**physics PLEASE HELP**

A hydraulic cylinder with a radius of 0.0268 m has a piston on the left end and a safety valve at the right end. The safety valve is a circular opening with a radius of 0.00639 m, sealed with a disk. The disk is held in place by a spring (spring constant = 964 N/m) that is ...
*November 1, 2012*

**physics**

The drawing shows an intravenous feeding. With the distance of 0.610 m, nutrient solution (ρ = 1010 kg/m3) can just barely enter the blood in the vein. What is the gauge pressure of the venous blood? Express your answer in millimeters of mercury.
*October 28, 2012*

**physics**

Between each pair of vertebrae in the spinal column is a cylindrical disc of cartilage. Typically, this disc has a radius of about 2.85 10-2 m and a thickness of about 7.14 10-3 m. The shear modulus of cartilage is 1.16 107 N/m2. Suppose that a shearing force of magnitude 10 N...
*October 18, 2012*

**neuroscience**

It's valid, for all you kids googling the answers to your homework :P
*October 9, 2012*

**History**

Plato and Aristotle both argued that political life should reflect humans' aspirations to live in a genuinely "good" society. However, their visions and ideas were very distinct. How were these "good societies" similar, and how were they different? ...
*September 26, 2012*

**Ap calculus**

Let h(x) = f (x-pi). Find the domain and range of h.
*September 10, 2012*

**accounting 205**

11,000
*July 15, 2012*

**ap chem**

you have 1.00 liter each of 0.10 M Na3PO4, Na2HPO4, NaH2po4 ka 1= 7.5*10^-3 ka2=6.2*10^-8 ka3=4.8*10^-13 a) prepare 500 ml of a buffer with PH= 7.6 b) how much 0.10 M HCL must be added to the 500ml of buffer to result in a PH=7.2 after the addition?
*May 30, 2012*

**Stats**

A public heath official wanted to know how often university students visit their student health centers due to illness or injury. The official took a nationwide random sample of 120 university students and found an average of (x bar) = 2.30 visits per student per year. It is ...
*April 25, 2012*

**chemistry**

Methanol (CH3OH) is used in the production of many chemicals. Methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2 H2(g) CH3OH(g) (a) How many moles of each reactant are needed to produce 4.83 102 g CH3OH? CO mol H2 mol (b) ...
*April 3, 2012*

**chemistry**

Methanol (CH3OH) is used in the production of many chemicals. Methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2 H2(g) CH3OH(g) (a) How many moles of each reactant are needed to produce 4.83 102 g CH3OH? CO mol H2 mol (b) ...
*April 3, 2012*

**math**

A cube of side length of 11cm and a mass of 2000g has what density?
*March 12, 2012*

**chemistry**

Thank you so much!
*March 4, 2012*

**chemistry**

I got 82g for the molar mass and I used the same method you demonstrated. We never learned the (H^+)=sqrt(k1k2) equation so I want to make sure I have the right answer. Did you get k2=9.3*10^-18
*March 4, 2012*

**chemistry**

a 205 mg sample of diprotic acid is dissolved in enough water to make 250 ml of solution. The pH of this solution is 2.15. A saturated solution of calcium hyrdoxide (Ksp=1.3*10^-6) is prepared by adding excess calcium hydroxide to water and then removing the undissovled solid ...
*March 4, 2012*

**chemistry**

explain how you would develop a scheme to separate and identify ag, pb, fe,and al in a solution that might contain all four as ions
*February 27, 2012*

**5th grade math**

Holly's garden is divided into 5 equal sections.she will fence 3 areas by grouping some equal sections together.how can writing an equation help you solve the problem?
*February 23, 2012*

**Physics**

The potetial energy of a spring is 0.25 J when it is compressed 0.05m to the left of the equilibrium position. At this point it comes to its leftmost position. What is its kinetic energy when it returns to its equilibrium point? a. zero b. 0.25 J and the object is moving to ...
*February 23, 2012*

**spelling **

What does v/cv and v/va mean
*January 24, 2012*

**geometry**

Find the area of a circle circumscribed about an equilateral triangle whose side is 18 inches long.
*January 22, 2012*

**spell**

I need 6 letter word with second letter is I and fourth letter is Y. No more vowels.
*January 5, 2012*

**algebra**

The Physical Education Deparment sells t-shirts for $12 and shorts for $8. One month, they sold 77 total items for $780 in total. How many t-shirts did they sell?
*January 3, 2012*

**Physics**

7.53
*December 13, 2011*

**Chemistry**

What is the mass of 14 liters of gasoline? Assume that the density of gasloine is .680 grams per cubic centimeter. Provide answer in kilograms.
*November 16, 2011*

**pre algebra with pizzazz 239**

They Couldn't find a man with his caliber haha
*October 27, 2011*

**Calculus**

If the slope is 3, find an equation of the tangent line to the curve at P(8, -3).
*October 8, 2011*

**Physics**

8m/s
*September 26, 2011*

**math**

im sorry my computer had the jitters you dont have to be rude so excuse me!
*September 11, 2011*

**math**

the answer is u divided by mg equals h?
*September 11, 2011*

**HELP PLZ**

please help
*September 11, 2011*

**math**

u = m*g*h find the value of h show work please
*September 11, 2011*

**9/11**

in new york they have many memorials
*September 11, 2011*

**Road Building+Environment**

Deforestation was a concern. The new technologies disrupted the natural balance of the ecosystem and contributed to climate change, which is a major issue today.
*July 31, 2011*

**algebra**

The formula R =−0.0026? + 4.0807 can be used to predict the world record, in minutes, for the 1500-m run t years after 1900. Determine (in terms of an inequality) those years for which the world record will be less than 3.8 min.
*July 22, 2011*

**history**

The first one I would put mercantilism. Second is true. Third is assembly line. Fourth is true. Fifth is labor union. Sixth is imperialism. Seventh I think is a truce. Eighth is depression. Ninth sit-down strike. Tenth is blitzkrieg. Eleventh is true. Twelth is MIC or military...
*May 23, 2011*