Sunday

February 26, 2017
Total # Posts: 2,425

**Math**

(X+4)^2=3 X^2+8x+16-3=0 X^2+8x+13=0 Use quadratic formula X=(-8±sqrt(64-4*13))/(2) =-(8±sqrt(12))/2 =-4±sqrt (3)

*October 11, 2015*

**Chemistry**

Calculate Delta H for the reaction CH4(g)+NH3(g)-->HCN(g)+3H2(g) given, N2(g)+3H2(g)->2NH3(g) DeltaH=-91.8kj C(s)+2H2(g)->CH3(g) DeltaH=-74.9kj h2(g)+2C(s)+N2(g)->2HCN(g) DeltaH=270.3kj

*October 11, 2015*

**maths**

if it takes 8 men 3 hours to clean a house, how many men would it take to get job done in 2.5 hours

*October 11, 2015*

**Physics**

A container holds 1.9 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 8.0x10-3 kg bullet with a speed of 960 m/s. What is the Kelvin temperature of the gas? do I use the formula? T= (mv^2)/u No 3k

*October 10, 2015*

**math**

When the movie is half over, popcorn sells for half price. Full price popcorn is $3.50, and drinks are $1.35. Determine the cost for purchasing 3 orders of popcorn and 3 drinks when the movie is half over. $

*October 3, 2015*

**chemistry equilibrium**

phsophorous trichloride and phosphorous pentachloride equilibrate in the presence of molecular chlorine according to PCl3 (g) +Cl2 (g)->PCl5 (g) Kc = 2.01 at 500k If a 1.000L reaction vessel is charged with .300 mol of PCl5(g) and allowed to equilibrate at this temperature...

*October 1, 2015*

**chemistry**

phsophorous trichloride and phosphorous pentachloride equilibrate in the presence of molecular chlorine according to PCl3 (g) +Cl2 (g)->PCl5 (g) Kc = 2.01 at 500k If a 1.000L reaction vessel is charged with .300 mol of PCl5(g) and allowed to equilibrate at this temperature...

*October 1, 2015*

**calc 2**

A loaf of bread is removed from an oven at 350 degrees F and cooled in a room whose temperature is 70 degrees F. If the bread cools to 210 degrees F in 20 minutes, how much longer will it take the bread to cool to 155 degrees F. Round to the nearest minute.

*September 29, 2015*

**maths**

I need explanation to this question.solve 48 base12 multiply by 15 base12.i can solve it by first converting to base ten and back to base 12,but i need to be able to solve directly in base12.Thanks

*September 29, 2015*

**Biology**

You find 3 trees where each tree gives a different coloured fruit: red, pink or orange. You perform crosses between all three trees and get the following results: P: red x pink ---F1: ½ red: ½ pink P: red x orange --- F1: ½ red: ½ orange P: pink x ...

*September 27, 2015*

**Physics**

Thank you so much!!!!

*September 27, 2015*

**Physics**

A fireman d = 33.0 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of θi = 21.0° above the horizontal as shown in the figure. If the speed of the stream as it leaves the hose is vi = 40.0 m/s, at what height will the ...

*September 27, 2015*

**Art**

city street by herman maril

*September 17, 2015*

**information technology**

write a pascal program which reads price of an item. the program should compute 25% discount on the original price, it should display the discounted amount and the discounted price of an item.

*September 16, 2015*

**Physics**

You toss a tennis ball straight upward. At the moment it leaves your hand it is at a height of 1.5 m above the ground, and it is moving at a speed of 7.8 m/s. (a) How much time does it take for the tennis ball to reach its maximum height? (b) What is the maximum height above ...

*September 16, 2015*

**physics**

A quarterback takes the ball from the line of scrimmage, runs backward for 18.0 yards, then runs sideways parallel to the line of scrimmage for 16.0 yards. At this point, he throws a 49.0-yard forward pass straight down the field. What is the magnitude of the football’s ...

*September 16, 2015*

**physics**

Vector B~ has x, y, and z components of 9.6, 6, and 8.5 units, respectively. Calculate the magnitude of B~ .

*September 16, 2015*

**physics**

A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 34.1 m/s. At the same time, it has a horizontal velocity of 53.5 m/s. At what speed does the vehicle move along its descent path? Answer in units of m/s.

*September 16, 2015*

**physics**

Bob heads out into a lake at an angle of 27◦ with respect to the shore. If his boat is capable of a speed of 1.3 m/s, how far from land will he be in 2 min and 28 s ? Answer in units of m.

*September 16, 2015*

**CHEM**

The following data were collected for determining the concentration of suspended solids in a water sample. (D= 1.01 g/mL). Express all calculated data with the correct number of significant figures. Volume of sample (mL): Trial 1: 25.0 trial 2: 20.0 trial 3: 50.0 trial 4: 25.0...

*September 15, 2015*

**algebra**

sorry Isiah is C. 0.625

*September 15, 2015*

**algebra**

Are you serious sue i have been reading some of his math questions and all I see at the end is your dumb ass saying what chart, what graph, duh its 12 or obvious don't see a graph. and now your telling him how to make profiles wtf. get a life sue if your not going to help ...

*September 15, 2015*

**physics**

As soon as a traffic light turns green, a car speeds up from rest to 50.0 mi/h with constant acceleration 7.50 mi/h-s. In the adjoining bike lane, a cyclist speeds up from rest to 17.0 mi/h with constant acceleration 14.50 mi/h-s. Each vehicle maintains constant velocity after...

*September 15, 2015*

**chem**

oh, i am sorry. I meant "data"

*September 14, 2015*

**chem**

The following state were collected for determining the concentration of suspended solids in a water sample. (D= 1.01 g/mL). Express all calculated data with the correct number of significant figures. Volume of sample (mL): Trial 1: 25.0 trial 2: 20.0 trial 3: 50.0 trial 4: 25....

*September 14, 2015*

**Math 10**

What is the circumference of the largest circle you could cut from a 30 cm by 20 cm sheet of paper? What area of paper would you cut away. PLZ HELP GUYS TEST TOMMOROW OH MA GAWD!

*September 14, 2015*

**Chem**

A 25.0 mL aliquot of a well-shaken and filtered sample of river is pipetted into an evaporating dish. The sample was heated to dryness. Assume the density of the river water was 1.01g/mL. The following data were collected for Trial 1. Complete the data. Record values with the ...

*September 14, 2015*

**Chem**

The following state were collected for determining the concentration of suspended solids in a water sample. (D= 1.01 g/mL). Express all calculated data with the correct number of significant figures. Volume of sample (mL): Trial 1: 25.0 trial 2: 20.0 trial 3: 50.0 trial 4: 25....

*September 14, 2015*

**Math**

Oh an also how do I solve this. 9 x (7-16) + 9

*September 14, 2015*

**Math**

Translate the following sentence into math symbols. Then solve the problem. y more than 4 is -36 My answer: 4 + y = =36 y = -40? Did I answer both of the questions right?

*September 14, 2015*

**Math**

I found out 2000 ml is not necessary knowledge to answer the equation. You simply do the following: (500g dextrose) * (100 ml solution/70g dextrose) = 714.29 ml

*September 13, 2015*

**Math**

A nutritional formula calls for 500 g of dextrose in a total volume of 2000 ml. how many milliliters of a 70% w/v dextrose injection are needed to provide the required amount of dextrose? This seems to be a dimensional analysis problem. We have: 500g/2000ml 70% w/v = 70 g ...

*September 13, 2015*

**Chemistry**

In the reaction, PCl3 + Cl2 ------> PCl5 the concentration of the reactants at equilibrium were each determined to be 7.2 mol/L, and the product at 0.050 mol/L. Calculate the equilibrium constant (rounding to 2 significant figures and using scientific notation), and state ...

*September 13, 2015*

**physics**

A 4000 kg trailer is towed up a hill with a 5% grade. If the towing truck starts from rest at the bottom of the hill and reaches a speed of 12 m/s at the top of the hill, how much is the towing force. The road from the bottom to the top of the hill is straight with a length of...

*September 11, 2015*

**Science**

the first one is c

*September 10, 2015*

**Science**

2 is D

*September 10, 2015*

**Science**

whats the answer ?

*September 9, 2015*

**physics**

a 60-kg student travelling in a 1000 kg car with a constant velocity has a kinetic energy of 1.2 *10^4 J. What is the speedometer reading of the car in km/h?

*September 3, 2015*

**Algebra**

For #3 wouldn't it be t-2 or something because it is 2 hours into trip

*August 31, 2015*

**Pre-Calculus**

Yes but it would be y=(9/5)x+32 Parentheses

*August 31, 2015*

**Maths**

A house plan shows a scale of 1:25. If the rectangular lounge room of the house is to measure 4 metres by 6 metres, what will the area of the lounge room be on the plan?

*August 30, 2015*

**math**

75x+55x=182 where x is time in hours 130x = 182 X=182/130

*August 29, 2015*

**calc**

2) would be y=8x+1/2 3) would be y=-6x+12 No 1 is correct

*August 29, 2015*

**language arts**

What can be inferred about how the Maori feel about the land they live on?

*August 28, 2015*

**Physics**

The height of a cylindrical container is 15 cm and the inside diameter of the container is 10 cm. a) what is the volume? b) How much weight (in kg) would be required to fill the container to a density of 1.3 g/cm^3?

*August 27, 2015*

**History**

C B A

*August 24, 2015*

**Trig**

Find all solutions of the equation in the interval [0,2pi). 2sin theta+1=0. Write answer in radians in terms of pi.

*August 19, 2015*

**math**

Thanks Damon. Now I understand the concept of it.

*August 19, 2015*

**math**

all of the following are coordinates on the same straight line except: A) (0,2) B) (3,11) C) (5,15) D) (7,23) E) (x,3x+2)

*August 19, 2015*

**physics**

A certain bacterium swims with a constant speed of 4.61 µm/s. How long will it take to swim across a petri dish that has a diameter of 8.69 cm?

*August 17, 2015*

**Life sciences**

1.Clear lime water turned milky after it was exposed to exhaled air

*August 17, 2015*

**Algebra**

Rewrite each expression with positive exponents and simplify. X^2•x^n/x^3•x^n What does this question mean? Do I just cancel things out? Please help

*August 15, 2015*

**Algebra**

Use absolute value notation. The distance between x and -10 is at least 6. |x-(-10)|>or=6 Is that notation correct?

*August 15, 2015*

**math**

edgar earns 200 dollars a week plus a 15% commission on all sales over 1,000 dollars.if edgar sells for one week or 2,500 dollars what is his gross pay for that one week.

*August 15, 2015*

**math**

a certain alloy contains 5.25% cooper. how much cooper is there in a piece weighing 200 pounds.

*August 15, 2015*

**math**

paul can type 60 words per minute and jenifer can type 80 words per minute how does pauls typing speed compare to jenifers

*August 15, 2015*

**pre-cal**

please help, step by step having difficulty here as well. Find the term containing x5 in the expansion of (x + 2y)^10

*August 12, 2015*

**pre-cal**

Use Pascal's triangle to expand the expression. (x − y)5 so I tried to work this out: (x-y)^5 = [(x-y)(x-y)][(x-y)(x-y)](x-y) (x-y)^2 = (x-y)(x-y) = x^2 - 2xy + y^2 x^2 - 2xy + y^2)(x^2 - 2xy + y^2) = x^4 -4x^3y + 6x^2y^2 - 4xy^3 + y^4 I am still confused can any ...

*August 12, 2015*

**physics**

A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 87.9 m/s2 for 1.51 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) ...

*August 12, 2015*

**Organic Chemistry (University)**

We're supposed to try and figure out the structure of a compound based off the the following information: δ: 2.4 2H triplet δ: 2.1 3H singlet δ: 1.5 2H triplet δ: 1.3 6H singlet δ: 0.9 3H triplet >δ: 2.4 2H triplet This is probably a CH2 ...

*August 11, 2015*

**physics**

What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 10.5 m/s when going down a slope for 3.18 s?

*August 11, 2015*

**physics**

A hot-air balloon is rising upward with a constant speed of 3.29 m/s. When the balloon is 3.38 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?

*August 11, 2015*

**Language Arts**

What lesson or meaning do you think the story "The Mark of the Beast" by Rudyard Kipling, held for the British audience of the Victorian era?

*July 26, 2015*

**US Government**

So on my study guide for a final I have this: In Gideon v. Wainwright, d___ _______ rights were the main issue in this Supreme Court case. I Don't know if it's defense attorney rights, or what, but I know this case gave the right to counsel and I'm just very ...

*July 21, 2015*

**math**

Solve for x:2^x=x^2

*June 22, 2015*

**Graduated :math**

yesterday ghana lotto winnig numbers was :07,67,76,71,69.please what are the numbers to win today.

*June 19, 2015*

**Statistics**

PsyDAG this is all the information that was given in the class. A researcher conducts a test on the effectiveness of a cholesterol treatment on 114 total subjects. Assuming the tails of distributions are normal distribution, is there evidence that the treatment is effective? ...

*June 18, 2015*

**Statistics**

A researcher conducts a test on the effectiveness of a cholesterol treatment on 114 total subjects. Assuming the tails of distributions are normal distribution, is there evidence that the treatment is effective? What is the Null and alternative hypothesis.

*June 18, 2015*

**geometry**

it is d

*June 14, 2015*

**Physics**

A box slides along a rough floor with initial kinetic energy of 7 J. A person pushes on the box, in the same direction as its velocity doing 25 J of work. The velocity of the box is doubled. Find the magnitude of the work done by friction.

*June 10, 2015*

**Finance**

That answer is way off, grow up!

*June 9, 2015*

**Math**

Convert the polar equation to rectangular form: r = -2cosø - 2sinø

*June 5, 2015*

**Economic**

What are welfare payments and we're South African government providing and to whom

*May 24, 2015*

**Maths**

A collection of coins consisting of 10-cent, 20-cent and 50-cent pieces has a value of $4.50. The number of 20-cent pieces is twice the number of 10-cent pieces and the number of 50-cent pieces is 3 less than twice the number of 10-cent pieces. How many 10-cent, 20-cent and 50...

*May 21, 2015*

**math**

Brittany made 75 at the first (100*3/4) After Ava gave her, Brittany had 120 (75+(9/20*100)) After Brittany gave Ava, Ava had 85 (55+(25%*120)) At the end Brittany had 90 and Ava had 85, so she 5 more

*May 21, 2015*

**Maths**

Luisa travels 25 km in 3hours 45 mins. She walks part of the way at 4 km/h and cycles the rest at 12 km/h. How far did she walk?

*May 21, 2015*

**Maths**

I got 37.0313 using your equation But in the text book the answer is 10km How to work it out using linear equations

*May 21, 2015*

**Maths**

Luisa travels 25 km in 3 3 4 hours. She walks part of the way at 4 km/h and cycles the rest at 12 km/h. How far did she walk?

*May 21, 2015*

**Math**

a rectangular tank with a square base of side 60 centimeters and a height of 45 centimeters is one third filled with water. water from a tap flows into the tank at 6 liters per minute. how long will it take to fill the tank completely? (1 liter=1,000 cm3

*May 18, 2015*

**math**

Water is taken from a well 11m deep in a bucket,the rope winding up to a drum 35cm in diameter. A)Through what angle does the handle turn in winding up 1m of rope? B)How many revolutions of the handle does it take to bring the bucket up from the bottom? C)If the arm of the ...

*May 11, 2015*

**Maths**

Three consecutive terms of a Geometric Progression are ? 6, p and ? 32 . find the value of p.

*May 1, 2015*

**Physics**

Mass m2 rests on an incline and attaches to a string that goes over a pulley, where mass m1 hangs on the other side of the incline. Assume that there is no friction between m2 and the incline, that m2 = 5.1 kg, m1 = 0.9 kg, the radius of the pulley is 0.10 m, the moment of ...

*May 1, 2015*

**math**

6cm diameter discs are cut from a sheet 130cm long and 70cm wide.(a)How many discs can be cut in this way (b) what area of the sheet is wasted? (My working so far). Area of rectangle=L*B 130*70=9100cm^2 area of circle=22/7 *(6/2)^2=28.286cm^2 (a)no of discs cut=9100/28.286=321...

*April 30, 2015*

**maths**

Three consecutive terms of a Geometric Progression are − 6, p and − 32 . find the value of p.

*April 30, 2015*

**Physics**

Can someone help me solve this? I've tried it a few times, but I keep getting answers that seem off. Like, for example, I'm getting 2.339 for part A, and it just seems completely off. So if you know the right formulas and can walk me through this, I'd appreciate it...

*April 27, 2015*

**Science**

Assuming all volume measurements are made at the same temperature and pressure, what volume of hydrogen gas is needed to react completely with 3.75 L of oxygen gas to produce water vapor?

*April 18, 2015*

**Chemistry**

Calculate the number of grams of nitrogen gas, N2, in a container that has a volume of 7.50 L at a pressure of 1200 mm Hg and a temperature of 38.2 degrees Celsius. (R=0.0821 L*atm/mole*K)

*April 16, 2015*

**algebra**

Given: 3(x-2y)+3x=y-2(x+4y), find the ratio of y to x

*April 11, 2015*

**Algebra**

6. One angle measures 54 more than 3 times another angle. The angles are supplementary. What are their measures? 11. A piece of string is 112 inches long. Isabel wants to cut it into 2 pieces so that one piece is three times as along as the other. How long is each piece?

*April 9, 2015*

**Physics**

I'm not getting the right answer for part b. Could someone help me understand this part better?

*April 6, 2015*

**Physics**

Could someone show me how to work this? It's for a study guide I'm practicing, and I just can't seem to get the correct answer. The position of a 0.63 kg object attached to a spring is described by [x = (1.09 m) cos(3.11πt)] a) Find the object’s position ...

*April 6, 2015*

**math**

rude.

*March 31, 2015*

**math**

3 cm which its area increasing when its edge is 12 cm long

*March 31, 2015*

**science**

The alleles for brown eyes (B) are dominant, while those for blue eyes (b) are recessive. If Lesley’s mother has the genotype BB and her father has the genotype bb, what is Lesley’s genotype? What is her phenotype?

*March 31, 2015*

**Medical physics**

1.A hypodermic needle of lenght 0.020m and inner radius 3.0 x10^-4 is used to force water at 20 degree celcious into the air at a flow rate of 1.0 x10^-7m^2 s-1 (a) what is the average velocity in the needle?(assume laminar flow), (b) what is the pressure drop necessary to ...

*March 28, 2015*

**Medical physics**

1.A hypodermic needle of lenght 0.020m and inner radius 3.0 x10^-4 is used to force water at 20 degree celcious into the air at a flow rate of 1.0 x10^-7m^2 s-1 (a) what is the average velocity in the needle?(assume laminar flow), (b) what is the pressure drop necessary to ...

*March 28, 2015*

**Chemistry**

A woman expends 96 kJ of energy in walking a kilometer. The energy is supplied by the metabolic breakdown of food intake and has a 35 % efficiency. If the woman drives a car over the same distance, how much energy is used if the car gets 8.7 km per liter of gasoline? The ...

*March 27, 2015*

**math**

The coordinates of (triangle) ABC are A(-3,-1 ) , B( 5,1 ) and C (2,4) (i) Calculate the length of AB , BC and AC (ii) Hence, show that (triangle) is a right- angled triangle

*March 27, 2015*

**chemistry**

50.0 mL of an unknown HCl solution was titrated with 0.449 M NaOH. To reach the equivalence point, 38.4 mL of the NaOH was used. What was the concentration of the HCl?

*March 25, 2015*