Saturday

March 28, 2015

March 28, 2015

Total # Posts: 426

**stats**

Find the probability of at least 2 girls in 10 births. Assume that male and female births are equally likely and that the births are independent events.
*March 16, 2015*

**statistics**

In a certain lottery, five different numbers between 1 and 31 inclusive are drawn. These are the winning numbers. To win the lottery, a person must select the correct 5 numbers in the same exact order in which they were drawn. What is the probability of winning?
*March 16, 2015*

**chemistry**

If four grams of Oxygen and four grams of Helium are placed in a five liter vessel at 338 K, what will be the partial pressure of each gas and the total pressure in the vessel?
*March 5, 2015*

**Chemistry **

Given that the initial rate constant is 0.0190s^-1 at an initial temperature of 20 degrees Celsius, what would the rate constant be at a temperature of 170 degrees Celsius? Activation energy is 32.4kJ/mol
*February 12, 2015*

**algebra**

A math class has a total of 47 students. the number of females is 17 less than the numberof males. how many males and how many females are in class?
*February 8, 2015*

**Math**

Find the adjusted balance due at maturity for a 90 day note of $15000 at 13.7% ordinary interest if a partial payment of $4000 is made on the 60th day of the loan.
*January 27, 2015*

**Math**

How do I find the exact interest on a loan for $3000 with a simple interest annual interest rate of 15% that was made on June 11 and was due on August 11.
*January 27, 2015*

**chemistry**

I dont understand...
*January 12, 2015*

**chemistry**

How do i convert mols cacl2 to agcl
*January 12, 2015*

**chemistry**

What mass of precipitate is formed when 0.750 L of 2.50 mol/L CaCl2 reacts with 650 mL of 1.75 mol/L AgNO3
*January 12, 2015*

**Chemistry **

Find the molar concentration of 57.9 g of potassiuum chlorate dissolved in 975 mL of water my work c=nv (57.9/122.55)(975ml) and i got 460 is this correct
*December 16, 2014*

**Physics**

An auditorium has dimensions 10m x 10m x 60m. How many moles of air fill this volume at STP? I'm stumped.
*December 3, 2014*

**Math**

do you borrow his bike for a total of 41 minutes.before lunch,he vote for one minute less than five times the number of minutes he rolled after lunch. how many minutes did you fire ride before lunch
*November 12, 2014*

**Chemistry 111**

Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 17. g of ethane is mixed with 107. g of oxygen. Calculate the minimum mass of ethane that could be left over by the chemical reaction. Be sure your answer has the ...
*October 22, 2014*

**geometry**

That's so helpful idiot Reiny
*October 2, 2014*

**Physics College**

What is the rate of deceleration of a 1400-kg SUV that is going 75.0 km/h and then slows to 25.0 km/h in 8.20 s?
*September 30, 2014*

**algebra**

the sum of to kim and tony's ages is 42, the difference in their ages is 4 years. what are the ages of kim and tony?
*September 22, 2014*

**Biology**

Is respiratory control sensitive to small changes in arterial PO2 or in arterial PCO2?
*September 8, 2014*

**Physics Electricity and Magnetism**

A microscopic droplet of ink in an ink-jet printer is deflected onto the paper by a force of 2.34×10-4 N. If the field causing the deflection is 6.62 kN/C, what is the charge on the droplet? What equation do I use to solve and What does each value mean in the equation? ...
*August 29, 2014*

**calculus**

a small business owner buys a truck for $20,000 to transport supplies for her business. She anticipates that she will use the truck for 5 years and that the truck will be worth $10,000 in 5 years. She plans to claim a depreciation tax credit using the straight-line ...
*August 2, 2014*

**Physics**

How long will it take the voltage across the capacitor in an RC circuit to discharge 75% of its initial charged voltage if the resistor has a resistance of 450 kilo-Ohms and the capacitor has a capacitance of 49 micro-farads? How do I solve this problem? Thanks!
*August 1, 2014*

**Math **

When you use a coupon for 15 percent off the original price of a headset, you pay $27. What is the original price of the headset? Please use an equation.
*June 2, 2014*

**Chemistry **

Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.) A) 310K B) 1070K C) 1470K ...
*May 14, 2014*

**math**

A truck has 5.9L engine in it. 5.9L of the overall displacement in 6 cylinders each 102mm bore (diameter) and 120mm stroke (length). Engine operates at 16.3:1 compression ratio and with 6psi (0.41atm) of boost cruising at 1600rpm. What is the volume of ONE cylinder? Then add 6...
*May 4, 2014*

**Chemistry**

Having trouble with this question on my homework =/ 200mL of 0.5M H2SO4 is combined with 500mL of 0.1M NaHCO3. List the physical states of all products, give molarity of aqueous ions and grams of gases and solids. Thanks alot guys!! Any help is awesome
*May 3, 2014*

**Physics- HELP PLEASE:)**

alright amanda you just do twenty five plus eight
*April 30, 2014*

**Chemistry**

Calculate empirical formula C=41.7%,H=6.2%,N=19.3%, and O=33.1% Thanks. any help at all will be awesome!
*April 22, 2014*

**Math Accounting**

Determine the proposal’s appropriateness and economic viability. For all scenarios, assume spending occurs on the first day of each year and benefits or savings occurs on the last day. Assume the discount rate or weighted average cost of capital is 10%. Ignore taxes and ...
*April 9, 2014*

**math**

In right triangle, the side opposite to right angle is called what? ANSWER FAST PLZ!!! THX
*January 29, 2014*

**alg 2**

1670 YAAAAAAAAAAAAAAAAAAAAAAAAAAAAY I GOT IT
*January 23, 2014*

**TRIG help quickly please**

Mark any solutions to the equation 2cos2x - 1 = 0. The answer can be more than one. Thank you π/8 -7π/4 15π/4 3π/4
*January 14, 2014*

**Science check answers please and quickly**

1. Jim is doing a physics experiment on the rate of cooling of solid objects in air. Which of the following is a variable that is not directly part of his experiment, but should be controlled in his experiment? (Points : 1) initial temperature to which he heats the solid ...
*January 8, 2014*

**Check Answers Quick -Physics**

What causes the centripetal acceleration of an electron in a hydrogen atom? electrical attraction gravity friction <-- tension Question 2. Which of the following terms might a jet pilot use to describe a force that presses him against his seat during a high-speed turn? ...
*December 16, 2013*

**pyhsis**

It is spelled physic
*November 22, 2013*

**Reading please please help**

Potatoes are good
*November 15, 2013*

**A/P Biology**

The Echinopsis mamillosa is a flowering cactus native to Bolivia. A high-rise building is built near a particular Echinopsis, filtering the amount of direct sunlight it receives. Which of the following processes is negatively affected first by the reduction in sunlight? ...
*November 14, 2013*

**Math 8th grade**

Type the missing number. -25 -23 -22 -21
*November 9, 2013*

**math - calc**

A conical water tank with vertex down has a radius of 12 feet at the top and is 26 feet high. If water flows into the tank at a rate of 30 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 12 feet deep?
*October 1, 2013*

**math - calc**

A conical water tank with vertex down has a radius of 12 feet at the top and is 26 feet high. If water flows into the tank at a rate of 30 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 12 feet deep?
*October 1, 2013*

**chemistry science**

substrate concentration= 3.5mM (c2) buffer=0.4 ml 10mM PNPP stock= ?ml (V1) water=?ml enzyme= 0.2ml total volume =1ml (V2) I need help with a dilution, I understand that you would be using c1v1=c2v2 but im confused as to what we need to find the amount of water and PNPP stock ...
*October 1, 2013*

**biochemistry**

substrate concentration= 3.5mM (c2) buffer=0.4 ml 10mM PNPP stock= ?ml (V1) water=?ml enzyme= 0.2ml total volume =1ml (V2) I need help with a dilution, I understand that you would be using c1v1=c2v2 but im confused as to what we need to find the amount of water and PNPP stock ...
*October 1, 2013*

**Math- factoring**

Show all work and factor completely. 6a^2+5a-4 (6a^2+8a)-(3a-4) 2a(3a+4)-1(3a+4) (3a+4)(2a+1) Is this correct?
*September 28, 2013*

**Math**

The Empire Carpet Company orders merchandise for $17,700, including $550 in shipping charges, from Mohawk Carpet Mills on May 4. Carpets valued at $1,390 will be returned because they are damaged. The terms of sale are 2/10, n30 ROG. The shipment arrives on May 26 and Empire ...
*September 25, 2013*

**math**

if a plane is traveling at an altitude of 11.9 miles and is 46 miles from the airport and is descending at a 12 degree angle, what is the mph to the airport?
*September 19, 2013*

**Algebra 2**

A pump removes 1000 gal of water from a pool at a constant rate of 50 gal/min. A.write an equation to find the amount of water y in the pool after t minutes B. graph the equation and interpret the t- and y-intercepts.
*September 8, 2013*

**Physics**

Vector C has a magnitude 25.8 m and is in the direction of the negative y axis. Vectors A and B are at angles á = 41.9° and â = 26.7° up from the x axis respectively. If the vector sum A B C = 0, what are the magnitudes of A and B?
*September 4, 2013*

**Finite Math**

A sinking fund is the accumulated amount to be realized at some future date (the end of the term) when a fixed number of periodic payments are paid into an account earning interest at the rate of i per period.
*July 24, 2013*

**math**

250 people on a plane; 120 speak english;150 speak spanish; 30 speak neither. what probability speak English and Spanish ?
*June 4, 2013*

**Math**

Suppose the quantity demanded per week of a certain dress is related to price by the demand equation p=√75-2x. In order to maximize revenue, how many dresses should be made and sold each week?
*May 6, 2013*

**calcullus **

Suppose the quantity demanded per week of a certain dress is related to price by the demand equation p=√75-2x. In order to maximize revenue, how many dresses should be made and sold each week?
*May 5, 2013*

**Physics...NEED HELP**

Physics help. what are the steps to solving the following problems? Attack on the ice fortress! A comic book villain has taken shelter in an ice fortress in an attempt to hide from the Avengers. Apparently, though, only the Hulk and some guy with a cannon are available to try ...
*May 3, 2013*

**math**

If the probability of an event happening is 2/5, then the probability of the event not happening is 3/5? This is False. The answer is 1/3. Explain why the answer is 1/3
*April 25, 2013*

**english**

is correct to say "the patient was brought to the operating room." ? "was brought" seems awkward. Instead, "the patient was taken to the OR."
*April 22, 2013*

**computer science**

I need help one how create a spreadsheet that will give an accurate launch profile for a vertical liftoff for the SpaceX Falcon 9 rocket. the information they give me is: •Start with a rocket with a mass, M1, moving with a speed, v1 •The rocket expels some small mass...
*April 13, 2013*

**volumes of prisms**

How do the volume of prisms compare as the number of faces in the prisms increases? Does the volume remain the same? Explain Please!
*April 7, 2013*

**math**

It costs $35 for 5 friends to go it for lunch. How much is the total bill including 8% tax? How much will each person pay if everyone pays an equal amount?
*April 6, 2013*

**Physics**

For parts A-C: /^Vo | 2M | velocity into pg. ->R )2m ) ------ top view rear view A car of mass, 2m, is going around a turn at a constant radius, R, with velocity, v0. The turn is not banked – it is a flat surface. Assume the car and the road are on Earth’s surface...
*April 6, 2013*

**Chem**

How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)
*April 4, 2013*

**chem**

Given that Ka for HClO is 4.0 × 10-8 at 25 °C, what is the value of Kb for ClO– at 25 °C? Given that Kb for CH3CH2NH2 is 6.3 × 10-4 at 25 °C, what is the value of Ka for CH3CH2NH3 at 25 °C?
*March 26, 2013*

**Chemistry**

I know how to do the ice chart and set up i just dont know how to get the x value that you are saying that i know...
*March 26, 2013*

**chemistry**

I dont understand what Y and X are supposed to be
*March 26, 2013*

**Proctology**

Hi, I am an 11th grade student beginning to look into some college options. I am interested in pursuing a career in proctology and have been reading some preliminary books on the topic. Can anyone recommend a college or pre-med program that would offer a strong proctology ...
*March 25, 2013*

**Critical Points, Etc.**

find the values for a, b, and c such that the function f(x)= x^3 + ax^2 + bx+ c has a critical point at (1,5) and an inflection point at (2,3). a= -6 b= 3 c= 7 i got those, but they're wrong. i'm not sure why. :/
*March 20, 2013*

**Tangent Lines (2)-Calculus**

find an equation of the line tangent to y= sqrt(25-x^2) at the point (3,4) i got y= x/8 + 29/8 this is wrong. but im not sure why. can you explain thank you
*March 20, 2013*

**Tangent Lines-Calculus**

a line is tangent to the curve y= (x^2 + 3)/ (x+3)^1/2 at the point where x=1. write the equation of this line i get y= 3x-1 yet it's wrong. please explain thank you
*March 20, 2013*

**CHEM**

IM SORRY!!!
*March 14, 2013*

**Quantum Physics**

The March 9 comment is right.
*March 3, 2013*

**Algebra**

Linear Function graphing. y=-x ???
*February 7, 2013*

**Can someone Please Help**

Chemistry
*February 4, 2013*

**Can someone Please Help**

You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A What would be the temperature of absolute zero in A ?
*February 4, 2013*

**Chemistry**

You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A What would be the temperature of absolute zero in A ?
*February 4, 2013*

**Chem Help!!!!**

thank you
*February 4, 2013*

**Chemistry**

I used slope to find the answer to the first part which was correct... the second part is what I need help with
*February 2, 2013*

**Chemistry**

Where did you get 44.4 from
*February 2, 2013*

**Chemistry**

Can someone pls help me!! You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A. What would be the boiling point of water in A ? What would be the temperature of absolute ...
*February 2, 2013*

**Chem Help!!**

How many inches is the section of the bar
*February 2, 2013*

**Chemistry **

You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A. What would be the boiling point of water in A ? What would be the temperature of absolute zero in A ?
*February 2, 2013*

**Precalc?**

Suppose that Cot(theta) = c and 0<theta<pi/2. what is a formula for tan (theta) in terms of c? Cot = 1/tan I know that, but I don't understand what the question is really asking for.
*January 23, 2013*

**Calculus**

Calculate Directly Log (base 4) 2 + log (base 16) 2
*January 23, 2013*

**Math**

Write fraction in simplest form. 25x2/35x
*December 14, 2012*

**chemistry**

i just need help to set them up
*December 13, 2012*

**chemistry**

10. If the calcium oxide were obtained by the heating of calcium hydroxide, how much hydroxide would be needed to obtain the 15.0 g? 11. If the 15.0 g of calcium oxide in the above problems were allowed to react with water, what amount of calcium hydroxide would be produced? ...
*December 13, 2012*

**math**

Solve sin2x + sin4x = cos2x + cos 4x for x in the interval[0,2pi) Hint: the following substitution should come in handy: sin3x= cos3x . tan3x
*December 3, 2012*

**math**

Toby is making a scale model of the battlefield at Fredericksburg. The area he wants to model measures about 11 mi by 7.5mi. He plans to put the model on a 3.25 ft by 3.25ft square table. On each side of the model he wants to leave at least 3 inches between the model and the ...
*November 30, 2012*

**math**

Toby is making a scale model of the battlefield at Fredericksburg. The area he wants to model measures about 11 mi by 7.5mi. He plans to put the model on a 3.25 ft by 3.25ft square table. On each side of the model he wants to leave at least 3 inches between the model and the ...
*November 30, 2012*

**soc 305**

In American society, those least likely to be living in poverty are ____________.
*November 27, 2012*

**Physics**

A thin, uniform rod is hinged at its midpoint. To begin with, one half of the rod is bent upward and is perpendicular to the other half. This bent object is rotating at an angular velocity of 6.8 rad/s about an axis that is perpendicular to the left end of the rod and parallel...
*November 17, 2012*

**Social Studies**

I was wondering if I could check my answers with someone. I'm a bit confused with interest. I put stars next to the answers I chose. Thank you. An interest rate is a special type of (1 point) loan. **price. bank. service. 2. How does a compound interest rate differ from a ...
*November 14, 2012*

**Conjecture**

what conjecture could be made and proven from the following? sin(3x)/sin(x) - cos(3x)/cos(x) I put it on my calculator and based on the graph I say that as it crosses the y axis the values get larger.
*November 14, 2012*

**Difficult Trig Word Problem**

sorry y(t) =4e(then the exponent -3t) all times sin(2pi*t)
*November 14, 2012*

**Difficult Trig Word Problem**

The displacement of a spring vibrating in damped harmonic motion is given by y(t) = 4e^-3t sin(2pi*t) where y = displacement and t = time with t greater than/equal to zero. Find the time(s) when the spring is at its equilibrium position (y=0). The number "e" is Euler...
*November 14, 2012*

**Precalculus 2**

Similiarly to a question I asked previously I took the same approach. the problem is: what value(s) of theta solve the following equation? cos(theta)sin(theta) - 2 cos(theta) = 0? I let Cos theta = X and sin theta = X unfortunately I end up with something completely odd. Can ...
*November 14, 2012*

**Triangles**

solve any triangles satisfying alpha = 20 degrees b = 10 c = 16 b and c are 2 side values and if I use the pythagorean theorem and I get 18.18? Did I do this right?
*November 14, 2012*

**Trigonometry**

What value(s) of theta solve the following equation? cos^2(theta)-cos(theta)-6=0? I try plugging in different numbers but I am not sure exactly what I am looking for in order to solve?
*November 14, 2012*

**Precalculus**

Sorry but I meant to say LS = cos^2x-sin^2y
*November 14, 2012*

**Precalculus**

Prove or disprove cos(x+y)cos(x-y)=cos squared (x) - Sin squared (x) I dstributed the cosines and attempted to cancel out terms but I can't get the signs right. Any help on what I am missing?
*November 14, 2012*

**Physics**

A certain light truck can go around a flat curve having a radius of 150 m with a maximum speed of 29.0 m/s. With what maximum speed can it go around a curve having a radius of 88.0 m?
*November 13, 2012*

**Physics**

An air puck of mass 0.23 kg is tied to a string and allowed to revolve in a circle of radius 1.0 m on a frictionless horizontal table. The other end of the string passes through a hole in the center of the table, and a mass of 0.9 kg is tied to it. The suspended mass remains ...
*November 13, 2012*

**Physics**

A race car starts from rest on a circular track of radius 445 m. The car's speed increases at the constant rate of 0.380 m/s2. At the point where the magnitudes of the centripetal and tangential accelerations are equal, find the following. (a) the speed of the race car (b...
*November 13, 2012*

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