Friday

October 9, 2015
Total # Posts: 1,529

**Algebra**

Find two points on the graph of the parabola other than the vertex and x-intercepts. k ( x ) = ( x − 1 )^(2) − 6
*October 7, 2015*

**Word problems**

Jennifer serves the volleyball to Debra with an upward velocity of 10.5ft/s. The ball is 5 feet above the ground when she strikes it. How long does Debra have to react, before the volleyball hits the ground? Round your answer to two decimal places.
*October 6, 2015*

**Chemistry **

What is the molarity of Cu2+ in a catalyzed reaction using 3 drops of CuSO4 at .03M in 50.0ml, and what is the molarity of Cu2+ using 6 drops? (Consider the extent of dilution of the 0.1 M CuSO4 solution in preparing the 50 mL reaction solution. Estimate 20 drops/mL.) My Work...
*October 3, 2015*

**Chemistry**

Oh sorry, 30 minutes is supposed to be the half life, so it should say first order reaction which has a half life (t1/2) equal to 30 minutes. I know, do you have any advice on what you'd do for the significant figures part? Would you go with the answer on there or do none ...
*October 1, 2015*

**Chemistry **

A certain substance undergoes decomposition by a first-order reaction which has equal to 30.0 minutes. If the initial concentration of the substance is 1.28 mol/liter, what will its concentration be after 2.50 hours? 1. 0.36 M 2. 0.040 M 3. -0.32 M 4. 0.020 M 5. 0.16 M 6. None...
*October 1, 2015*

**math**

trevor paints 1/6 of the fence each day how many days will it take to paint 3/4 o the fence
*September 24, 2015*

**Chemistry **

At 573 K, gaseous NO2(g) decomposes, forming NO(g) and O2(g). If a vessel containing NO2(g) has an initial concentration of 1.9 × 10−2 mol/L, how long will it take for 75% of the NO2(g) to decompose? The decomposition of NO2(g) is second-order in the reactant and ...
*September 23, 2015*

**Chemistry **

The reaction 2NO(g) + 2H2(g) N2(g) + 2H2O(g) goes twice as fast when the concentration of H2 is doubled but four times as fast when the concentration of NO is doubled. What is the overall reaction order? I did it like this: k[NO]^m[H2]^n 2r=[H2]^n, meaning that the order for ...
*September 23, 2015*

**pre calculus**

The minute hand and the hour hand of a clock have lengths inches and inches, respectively. Determine the distance between the tips of the hands at 10:00 in terms of and m h.
*September 20, 2015*

**Chemistry**

Yeah, I was wrong, and it is a zero order reaction. If I do it that way, I get 4 to be an answer. Why can you do this as a stoichiometry problem? I guess I thought the rate orders were separate from the stoichiometric coefficients?
*September 19, 2015*

**Chemistry **

C. Consider the reaction 2C3H6 + 9O2 6CO2 + 6H2O. If the rate at which C3H6 is reacting is 0.40 mol liter−1s−1, then the rate at which 1. O2 is reacting is 1.6 mol liter−1s−1 2. CO2 is being formed is 0.40 mol liter−1s−1 3. H2O is being ...
*September 19, 2015*

**Chemistry **

Calculate the enthalpy change (ΔH) for: HCl(aq) + NH3(aq) → NH4Cl(aq) The reaction of 50.0 mL of 1.00 M HCl with 50.0 mL of 1.00 M NH3 causes a temperature rise of 6.4 ˚C in the resulting 100.0 mL of solution. The NH4Cl solution has a density of 1.005 g/mL and ...
*September 15, 2015*

**Chemistry **

Follow up question: Explain why the reaction of aluminum metal with aqueous sulfuric acid solution has very nearly the same ΔH value as the reaction between aluminum metal and HCl? Consider the atomic level. All I have is that they have the same net ionic equations. The ...
*September 10, 2015*

**Chemistry URGENT! **

If the reaction of 0.500 grams of aluminum metal with excess aqueous HCl releases 9.72 kJ of heat, what is the ΔH value for the reaction? 2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g) All I have is: .500gAl*(1 mol Al/26.98gAl) Please and thank you so much!
*September 10, 2015*

**Chemistry **

The PH3 molecule is 1. linear 5. tetrahedral 2. bent 6. trigonal bipyramidal 3. planar triangular 7. octahedral 4. trigonal pyramidal 8. None of these Do you think the professor is asking for molecular shape or electron geometry. I know the electron geometry is tetra and the ...
*September 9, 2015*

**Chemistry **

Which of the following molecules has a double bond? 1. NO3- 4. H2 2. C2H4 5. C12 3. SO2 6. None of the previous answers I got that three of these molecules have a double bond (NO3-, SO2, and C2H4), but the answer is one. I am thinking that maybe the professor wants C2H4 ...
*September 9, 2015*

**physics**

A photographer in a helicopter ascending vertically at a constant rate of 1.2m/s accidentally drops a camera out of the window when the helicopter is 46m above the ground. How long will it take the camera to reach the ground
*September 6, 2015*

**Programming**

This question is about football matches between teams. A record of games played between teams is stored in a graph G. Each edge in the graph corresponds to a match between a pair of teams. For example, if there is an edge between vertices 3 and 6 then Team 3 has played a match...
*August 15, 2015*

**Physics **

A spaceship is on a straight-line path between the Earth and the Moon. At what distance from (the centre of) Earth is the net gravitational pull on the probe from the Earth and the moon zero? Mass of Earth = 6×10^24 kg. Mass of Moon = 7×10^22 kg. The distance from ...
*August 14, 2015*

**Physics **

Two equal-mass stars orbit their centre of mass. The distance between the stars (measured from the centre of mass of each) is 1 AU. What is the period of revolution in years? How much energy would be required to unbind these stars if they each have the same mass as the sun? ...
*August 14, 2015*

**Math**

Find 3 consecutive positive integers whose product is 5 more than the cube of the middle number. Tried x*(x+1)*(x+2) = (x+1)^3 + 5, but that solves to x = -6 which isn't positive.
*July 21, 2015*

**grad stats**

. Create standardized scores for all scale variables (price through alcohol). Which beverages have positive standardized scores on every variable? What does this mean?
*June 23, 2015*

**Chem 30 **

The solubility of KCL is water is 30g/100g of water at 20 degrees centigrade. A heated solution containing 60g of KCl in 140g of water is cooled to 20 degrees C. How many grams should precipitate out of solution?
*June 22, 2015*

**Grad Economic**

If the real money demand is greater than the real money supply, interest rates must rise to reach equilibrium in the money market as institutions sell bonds to obtain more money.
*June 11, 2015*

**ECONOMIC**

What economic factors are relevant in managerial decision making?
*June 5, 2015*

**ECONOMIC**

Describe the market structure of the beverage industry.
*June 5, 2015*

**ECONOMIC**

The income elasticity for most staple foods, such as wheat, is known to be between zero and one. As incomes rise over time, what will happen to the demand for wheat? What will happen to the quantity of wheat purchased by consumers? What will happen to the percentage of their ...
*June 5, 2015*

**ECONOMIC**

Suppose that the demand for oranges increases. Carefully explain how the rationing function of price will restore market equilibrium
*June 5, 2015*

**ECONCMIC**

Suppose that the price elasticity of demand for wheat is known to be -0.75. Will a good wheat crop (which increases the supply of wheat) be likely to increase or decrease farmers’ revenues?
*June 5, 2015*

**math**

A bird is flying southward at a rate of 480 mph. There is an east wind blowing at 60 mph. What is the new speed and direction of flight of the bird?
*May 28, 2015*

**Stats**

Would you necessarily expect the confidence interval to be the same as a test of significance? From how I see it is say yes cause then it proves the answer twice in two difference methods ?
*May 24, 2015*

**Chemistry**

How many seconds does it take to deposit 81.5 g of Zn on a steel gate when 21.0 A is passed through a ZnSO4 solution?
*May 21, 2015*

**Calculus**

Let f for all Real numbers, be an odd function. Explain why, for any positive number a, the integral from -a to a of f(x) = 0.
*May 19, 2015*

**Math**

Thank u two!!
*May 12, 2015*

**Math**

(-2c^4)(4cd)(-cd^2)
*May 12, 2015*

**Science**

Should the government establish a national park to preserve the tundra in Alaska?
*May 11, 2015*

**Math**

Thanks Henry!!!
*May 10, 2015*

**Math**

Solve for y, state the m and b, and graph. X-3y+9=0
*May 10, 2015*

**Physical Science**

A girl pushes on a box of Christmas Ornaments with a mass of 12 kg and it moves an acceleration of 2m/s^2. With what force does the girl push on the box?
*May 8, 2015*

**Algebra 2**

Using data for the effect of temperature and wind on an exposed face, the National Weather Service uses the following formula, Wind Chill Index = 35.74 + 0.6215𝑇 − 35.75𝑉!.!" + 0.4275𝑇𝑉!.!" 𝑇 is the temperature in degrees...
*May 1, 2015*

**stat**

Find an estimate of the sample size needed to obtain the specified margin of error for the 95% confidence interval. A researcher wishes to estimate the mean amount of money spent per month on food by households in a certain neighborhood. She desires a margin of error of . Past...
*April 26, 2015*

**math**

what did you use pythagoras for and how?
*April 20, 2015*

**Math**

A rocket is launched straight up. At t seconds after being launched, its altitude is given by h = 4t^2 metres. You are on the ground 400 metres from the launch site, watching the rocket. The line of sight from you to the rocket makes an angle theta radians with the ...
*April 20, 2015*

**Math**

If a man runs for an hour and a half at 8 miles an hour due south; and then he continues south on a bus traveling at 55 miles an hour, for 24 minutes. How far did he travel?
*April 15, 2015*

**Math**

If you were stacking 13 in. boxes in a 58 in. closet, would you round up or round down to determine how many can fit? How many would fit? How do I solve this problem.
*April 8, 2015*

**english **

I need someone's help on editing my paragraph.... OPC is a great place for an athlete because OPC offers many options for the athletes and don’t forget about their countless banners. OPC as school give the athlete’s the opportunity to choose from a wide variety ...
*March 30, 2015*

**math **

The function f(x) = cx/2 x+3 satisfies f(f(x))=x for all real numbers x\= -3/2. Find c.
*March 27, 2015*

**ALgebra **

The function f(x) = cx/2x+3 satisfies f(f(x))=x for all real numbers x\= -3/2. Find c. (\= does not equal)
*March 27, 2015*

**Physics **

A 10kg suitcase is placed on a horizontal conveyor belt the top of which moves to the right. The coefficient of static friction between the belt and box is µs = 0.5 and that of kinetic friction is µk = 0.3. a) Sketch a free body diagram for the suitcase, showing ...
*March 25, 2015*

**math**

Trent wants to build a rectangular pen for his animals. One side of the pen will be against the barn; the other three sides will be enclosed with wire fencing. If Trent has 400 feet of fencing, what dimensions would maximize the area of the pen?
*March 20, 2015*

**Physics**

An F-18 with a weight of 22500 lbs lands on a carrier with a speed of 120 mph. If the run-out of the arresting cable is 160 ft, what is the planes acceleration in feet per second squared?
*March 15, 2015*

**Geom**

I have a 25cm wheel across how many rotations to go 100000 kilometers
*March 14, 2015*

**Chem **

In photography, unexposed silver bromide is removed from film by soaking the film in a solution of sodium thiosulfate, Na2S2O3. Silver ion forms a soluble complex with thiosulfate ion, S2O3^2-, that has the formula Ag(S2O3)2^3-, and formation of the complex causes the AgBr in ...
*March 10, 2015*

**precalculas**

write as a single logarithm 2IN plus In y munus In2y
*March 9, 2015*

**precalculas**

the population of preston is 89000 and is decreasing by 1.8% each year A:Write a function that models the population as a function of time t b predict when the population will be 50000
*March 9, 2015*

**Physics**

After a snowstorm a boy and girl decide to have a snowball fight. The girl uses a large slingshot to shoot snowballs at the boy. Assume that the girl fires each snowball at an angle 0 from the ground and that the snowball travel with an initial velocity of V0.. 1.in terms of ...
*February 23, 2015*

**math**

6/12
*February 12, 2015*

**math**

for what value of x (radicand) and n (index) can the expression "n root x " not be evaluated?
*February 5, 2015*

**math help**

thank for helping Steve.
*January 31, 2015*

**math help**

(x+5)^2 - (x-5)^2 is factored, it can be written as Ax where A is a whole number. The value of A is?
*January 31, 2015*

**2nd grade math**

Yes. You can take a four sided shape and have a line go through one corner to the opposite. that would be two triangles making up a four sided shape.
*January 29, 2015*

**Geometry**

How many different surface areas are possible when 8 one inch cubes are arranged so that each has one or more faces in common (touching) with at least one of the other cubes? We have to use a physical model. And I have no idea how to start this or even do it. Please be ...
*January 25, 2015*

**Math**

C as the square of 12 and 5 is equal to square of 13 , as per Pythagoras theorem , in a right angled triangle, the sum of the squares of the two sides forming the right angle is equal to the square of the hypotenuse
*January 24, 2015*

**Maths**

I think the miles they flew altogether will still be the same 1180
*January 24, 2015*

**Maths**

1180
*January 24, 2015*

**Maths**

If 15 swallows flew 380 miles south then had a rest,then flew 800 miles towards the coast. How many miles did each fly? How many miles they flew altogether?
*January 24, 2015*

**Math**

Stephen was taking photographs of 71 different locations. At each location Stephen too 24 different pictures. How many pictures did Stephen take total? Is this answer correct 71 X 24 = 1704?
*January 21, 2015*

**math**

In the following triangle, AB ⊥ CD and AC ⊥ BC CD is the bisector of triangle ABC If AD = 16m, and CD = 8m, find BD
*January 12, 2015*

**Science And Technology Engineering Mathematics**

Do you know some site where can I look for Science And Technology Engineering Mathematics books?
*January 11, 2015*

**AP Chemistry**

A mixture of 20.0 grams of CaO and BaO is placed in a 12.5 L vessel at 200oC with excess CO2 . The mixture is allowed to react to completion forming CaCO¬3 and BaCO3 .The pressure in the container after reaction is 220 torr. The solid carbonates are neutralized by adding ...
*January 3, 2015*

**AP Chemistry**

A mixture of 20.0 grams of CaO and BaO is placed in a 12.5 L vessel at 200oC with excess CO2 . The mixture is allowed to react to completion forming CaCO¬3 and BaCO3 .The pressure in the container after reaction is 220 torr. The solid carbonates are neutralized by adding ...
*January 2, 2015*

**Algebra**

Find amplitude period and phase shift for F(x)=-3cos(4x+n)+6
*December 25, 2014*

**Chemistry**

what are the intermolecular forces present in: 1. n-propyl alcohol 2. n-butanol 3. 2-butanol 4. tert-butanol alcohol 5. pentane 6. hexanes I know that the forces include- dipole-dipole, ion-dipole, dispersion, and hydrogen bonding...but I don't know how to pick which one ...
*December 21, 2014*

**Physics**

A ball is thrown upwards with an initial velocity of 16 m/s. What is the velocity of the ball 1.5 s later? After the ball leaves the hand of the thrower, what is the value of acceleration acting on the ball as it is rising upwards? 9.8x1.5 = 14.7. 16-14.7=1.3 m/s after 1.5s. ...
*December 15, 2014*

**chemistry**

What is the molality of 67.1g of Nano3 in 2.5l of water
*December 11, 2014*

**chemistry**

how wud u prepare 1L of a 1.30M aqueous solution of barium sulfide explain
*December 11, 2014*

**chemistry**

how much heat has been absorbed by 2500g of water when its temperature changes from 23c to 27c PLEASE EXPLAin
*December 11, 2014*

**math**

NVM i think i've done it. I simplified to -2(15+8J)/-289 correct if i'm wrong please!
*December 8, 2014*

**math**

Evaluate 2/(1+J4)^2 I got as far as: (1+j4)^2=(1+j4)(1+j4)=1+j4+j4+j4^2=1+J24 OR (1+j4)^2 (/2) =(0.25+j)(0.25+j)=0.0625+j+j+j^2 =0.0625+j+j-0.0625=J^2 I think it can be take further. but im not sure i'm right.
*December 8, 2014*

**math**

each person had $1.25 Because: There are four of them, therefore $1.25*4=5 They then each double the previous amount, so: 5*2*2*2*2=$80 or in reverse:80/2/2/2/2=5 5/4+1.25
*December 8, 2014*

**6th grade math**

the sum of twelve divided by twice a number
*December 4, 2014*

**English 10th grade**

"I'd done a car for one of her patients, who told her about me." Which of the following describes the part, "who told her about me." A. nominal clause B. adjectival clause C. infinitive D. gerund phrase Is the answer, B, the adjectival clause describing...
*December 3, 2014*

**English 10th grade**

"Well that's sculpture, making a '74 Toyota look like a '63 Corvette, only I didn't think of it that way...I was doing good work, and I was making good money." What is the purpose of the ellipsis (...)? I have it down to two possible answers: A. to ...
*December 3, 2014*

**English 10th grade**

"On windy days, you can hear its wings beating like a pair of brass cymbals." The part, "beating like a pair of brass cymbals" constitutes which of these? A. nominal clause B. adjectival clause C. gerund phrase D. participial phrase I chose D. participial ...
*December 3, 2014*

**English 10th grade**

Which of the following correctly describes this sentence? It looms menacingly over the road from the roof of a farmhouse, a flying reptile with a seven-foot wingspan. A. Simple B. Complex C. compound D. compound-complex I felt it was a simple sentence.
*December 3, 2014*

**chemistry**

A piece of an aluminum can was cut into small pieces. Then 0.422 g of the chips from the can was used to prepare potassium alum according to the procedure we used. Calculate the theoretical yield (in g) of potassium alum that could be obtained in the reaction. (Alum MW=474.41 ...
*December 2, 2014*

**English**

"who told her about me"
*December 2, 2014*

**English**

I’d done a car for one of her patients, who told her about me.” Which of the following describes the underlined words in this sentence? A. a nominal clause B. an adjectival clause C. an infinitive phrase D. a gerund phrase I chose B, the adjectival clause.
*December 2, 2014*

**English**

Oops, What is the purpose of the elipsis (...)
*December 2, 2014*

**English**

“Well that’s sculpture, making a ’74 Toyota look like a ’63 Corvette, only I didn’t think of it that way... I was doing good work, and I was making good money. A. to prepare the reader for a change in topic. B. to show Ramirez’s pride in ...
*December 2, 2014*

**English**

There are no pterodactyls in Ramirez’s front yard, but there are a mother dolphin, her baby, and two sheep. There’s a Don Quixote on his horse, aiming his lance at a windmill. There’s a space alien emerging from a flying saucer and an abstract baseball player ...
*December 2, 2014*

**English**

What does the part, "beating like a pair of brass cymbals" constitute? On windy days, you can hear its wings beating like a pair of brass cymbals. I think it is a participial phrase.
*December 2, 2014*

**English**

What type of sentence is this? (simple, complex, compound, compound-complex) 1. It looms menacingly over the road from the roof of a farmhouse, a lying reptile with a seven-foot wingspan. I think it is a simple sentence.
*December 2, 2014*

**math**

The second number is the square root of the first (sqrt169=13) therefore you just need to put sqrt144 into google or a calculator to get the answer, 12.
*November 9, 2014*

**Physics**

look in the related questions. theres about 1000questions the same or very similar to this.
*November 8, 2014*

**SCIENCE**

4:A 100cm to the m so 680*100=68000 5:A correct 6:A correct 7:D . both A and D are volumetric measures but litres are more appropiate on the scale of a barrel 8:A correct 9:D (i think) new information feelings are testable but not particularly useable as scientific data as ...
*November 3, 2014*

**Business Statistics**

idk
*October 22, 2014*

**Physics Help Please!!!!**

A man pushes a stalled car with a horizontal force of 312 N. The car does not move. What is the frictional drag force on the car? A water-skier (mass=60kg) is pulled by a boat with a horizontal force of 300N. The boat and the skier have a constant velocity. What is the ...
*October 16, 2014*

**Physics Help Please!!!!**

During a launch of the shuttle, fuel is being burned at a rate of 2000 kg every second. the exhaust from the burning of this fuel is expelled by the engines and can be seen during the launch. readings from instruments mounted on the space shuttle show that for the first 2 min ...
*October 15, 2014*