Saturday

September 5, 2015
Total # Posts: 473

**AP CHEMISTRY**

A dilute solution of which acid is most likely to produce a reduction product other than H2 when it reacts with a metal? A)HF B)HCL C)HNO3 D)H2SO4 Answer is C. I know it has something to do with it producing oxygen, but I really don't understand where that comes from. ...
*March 29, 2013*

**AP CHEMISTRY**

Determine the volume of 0.125 M NaOH required to titrate to the equivalence point 25.0 mL of a 0.175 M solution of a monoprotic weak acid that is 20% ionized. Answer is 35.0 mL. How do you find it?! It's been a really long time since we talked about titrations. Please help (:
*March 29, 2013*

**statistics**

Margin of Error=z*(s/sq.root n) 25=2.32635(80/sq.root n) n= 55.4 Round UP= 56
*March 29, 2013*

**AP CHEMISTRY**

OH, thank you soo much. I forgot about the solid thing!
*March 29, 2013*

**AP CHEMISTRY**

C(s) + H2O(g) ⇌ CO(g) + H2 ΔH>0 For the system above at equilibrium, which changes will increase the amount of H2(g)? I. Adding C(s) II. Increasing the volume of the container III. Increasing the temperature The answer is II and III. I understand everything ...
*March 29, 2013*

**arithmetic**

the sum of two distinct numbers is 20,and their G.M is 6. find the numbers
*March 6, 2013*

**Math**

Hi. please help me solve the ffg. differential equation: D^2y=3sinx-4y given y=0 and dy/dx=1 at x=pie/2 Need full solution. Tx
*February 27, 2013*

**Math**

Hi, Please help me solve the ffg. set of simultaneous equations using D-operators: dy/dx+2x-3y=1 dy/dx-3x+2y=e^-t
*February 27, 2013*

**physics 203**

a projectile is thrown with initial speed v0=25.0m/2 at an initial angle with the horizontal ANGLE=45 degrees. a. find the time when the projectile is at the maximum height. b. find the position(x,y) at the maximum height. c. at time T, find the components of the acceleration ...
*February 22, 2013*

**chemistry**

Suppose you have a solution containing both an iron ii salt and an iron iii salt. how would you proceed to identify both Fe 2+ and Fe 3+ in this solution?
*February 12, 2013*

**green lawns**

On reaction with BaCl2 both will form a white ppt. But in the case of H2SO3 the ppt would be soluble in HCl but not in the case of H2SO4
*February 3, 2013*

**English**

Thanks :D You're a life saver
*January 30, 2013*

**English**

1. Which of the key reading skills for reading informational articles involves looking for key words and phrases in a text before reading the text? A. identifying main idea and supporting details B. previewing C. skimming and scanning D. understanding text structures
*January 30, 2013*

**English**

Okay, thanks
*January 9, 2013*

**English**

In other places on the Internet, people have used (Walt Disney Company, Mulan) to cite. Is this acceptable too?
*January 9, 2013*

**English**

How do you cite this quote in MLA format? “The flower that blooms in adversity is the rarest and most beautiful of all.” I'm having issues because the quote is said by Mulan in Walt Disney's "Mulan". Do I say Mulan says it or the Walt Disney Company...
*January 9, 2013*

**Biology**

In a lab on lung capacity where lung volumes (Tidal Volume, Expiratory Reserve Volume, Inspiratory Capacity, Inspiratory Reserve Volume, and Vital Capacity) are measured... Why can't you measure the Inspiratory Reserve Volume (IRV) directly? (In the procedure it says to do...
*January 2, 2013*

**Biology**

In a lab on lung capacity where lung volumes (Tidal Volume, Expiratory Reserve Volume, Inspiratory Capacity, Inspiratory Reserve Volume, and Vital Capacity) are measured... Why can't you measure the Inspiratory Reserve Volume (IRV) directly? (In the procedure it says to do...
*December 31, 2012*

**computers**

coolmathgames(dot)com games(dot)com miniclipgames(dot)com (this one is my fav)
*December 26, 2012*

**english**

Odysseus was BRAVER THAN the rest of the crew [I'm assuming this is what you meant] so he led us TO FOOL Cyclops. He gave some wine to Cyclops to get him drunk. Then Odysseus, a couple of the crew, and *I* stabbed Cyclops in the eye. Also [perhaps THEN or synonyms would be...
*December 9, 2012*

**Grammar**

Can you put (grin) in a sentence where it acts as direct object?
*November 20, 2012*

**Physics**

Mary weighs 459 N and she walks down a ﬂight of stairs to a level 4.7 m below her starting point. What is the change in Mary’s potential energy?
*November 12, 2012*

**Chemistry**

what do you use for the V in PV=nRT?
*November 8, 2012*

**Chemistry**

15.8 grams of potassium chlorate is decompossed and the gas is colected over water at 29 degrees celcius when water vapor pressure is 30 mmHg. Assuming 100% yeild of products, what is the total pressure in the vessel after the reaction in complete?
*November 8, 2012*

**Chemistry**

(2*-393.5+4*-242)-(2*-293+0) Delta H+ -1169 kJ/mol
*November 8, 2012*

**Math-Quartic Equation**

Reduce this equation using the quadratic formula, factoring, or other algebraic method to determine the other zeros of the function. F(x)= 4x^4 - x^3 - 11x^2 -2x +6
*October 28, 2012*

**world history**

Which of the following provides the most significant contrast to the feelings of the detained Chinese immigrants at the Angel Island Immigration Center in California? A.The feelings of the Chinese immigrants at Ellis Island. B.The feelings of the Europeans immigrants at Ellis ...
*October 26, 2012*

**algebra**

A train leaves the station at 9:00 pm traveling east at 36 miles per hour. A second train leaves the station at 10:00 pm traveling west at 42 miles per hour. At what time will both trains have traveled the same distance? I need help solving it :)
*October 4, 2012*

**math**

A train leaves the station at 9:00 pm traveling east at 36 miles per hour. A second train leaves the station at 10:00 pm traveling west at 42 miles per hour. At what time will both trains have traveled the same distance? I need help solving it :)
*October 4, 2012*

**science**

Sediment can be directly turned into which of these types of rock? Select all that apply. A. igneous B. sedimentary C. metamorphic i think its all of them correct?
*October 3, 2012*

**science**

What is the relationship between a mineral and a rock? A.They are the exact same thing. B.A mineral is a building block of rocks. C.Minerals are only silicates while rocks are nonsilicates. D.A rock is always man-made while a mineral is naturally occurring. I think the answer...
*October 3, 2012*

**math**

An art collector buys 6 pieces a year for y years before donating 27 pieces to a museum. Which algebraic expression represents the number of pieces the collector still has in her possession? would the answer be 6y - 27?
*October 2, 2012*

**math**

A miniature-doll collector has a total of 254 unique dolls. The collector can afford to add 3 unique dolls a week to the collection. Which algebraic expression represents the number of unique pieces the collector has at the end of w weeks? would the answer be 254+3w?
*October 2, 2012*

**math**

Felipe has saved $625. He is starting a part-time job that pays him $150 a week, and he plans to save all of the money he earns. Which algebraic expression represents Felipe's total savings after x weeks? A.625x + 125 B.775x C.150x + 625 D.125x - 650 is it c?
*October 2, 2012*

**math**

okay. I think the answer is b?
*October 2, 2012*

**math**

A cell phone company charges each customer a base rate of $15.00 per month for its services. The company also charges each customer $0.02 per minute used. Which algebraic expression represents each customer's monthly charge for m minutes? A.15 (0.02m) B.15 + 0.02m C.15m...
*October 2, 2012*

**math**

I believe it is c?
*October 2, 2012*

**math**

Felipe has saved $625. He is starting a part-time job that pays him $150 a week, and he plans to save all of the money he earns. Which algebraic expression represents Felipe's total savings after x weeks? A.625x + 125 B.775x C.150x + 625 D.125x - 650
*October 2, 2012*

**math**

Before she went to the grocery store, Jana had 4 tomatoes in her refrigerator. For the next 3 weeks she buys n number of tomatoes each week. Which algebraic expression represents how many tomatoes she has at the end of three weeks? A. 4 − 3n B. 4 + 3n C. 3n − 4 D.
*October 2, 2012*

**Math**

According to math teachers what did the acorn say when it grew up
*September 24, 2012*

**physics **

from equation t equal to root x+3 find velocity and acceleration t equal to 1second
*September 23, 2012*

**physics **

from equation t equal to root x+3 find velocity and acceleration t equal to 1second
*September 23, 2012*

**physics **

a balloon is moving upwards with speed of 5m per second .when it is at height 98 m.a packet dropped from it .what velocity of packet when it strikes the ground
*September 23, 2012*

**math**

1225
*September 23, 2012*

**chemistry**

check the mole quickly
*September 23, 2012*

**sugarhill**

i need help with this problem 6/13 devided by 4/39
*September 19, 2012*

**3rd grade Math**

I meant 18
*September 19, 2012*

**3rd grade Math**

6x10=60 78-60=18 so the answer is 19
*September 19, 2012*

**ap stats**

all students in a pe class completed a basketball free throw shooting event and the highest number of shots made was 32. the next day a student who had transferred into the school completed the event, making 35 shots. indicate whether adding the new student's score to the ...
*August 29, 2012*

**ap stats**

all students in a pe class completed a basketball free throw shooting event and the highest number of shots made was 32. the next day a student who had transferred into the school completed the event, making 35 shots. indicate whether adding the new student's score to the ...
*August 28, 2012*

**algebra college**

find the remaining zeros of f. degree 4 zeros i, -18+i enter the remaining zeros of f please help me out!
*August 27, 2012*

**college algebra**

form a polynomial f(x) with real coefficients having the given degree and zeros degree 4 zeros 5+3i;3 multiplicity 2 enter the polynomial f(x)=a?()
*August 27, 2012*

**algebra**

so i am right? x and y? x=-2.344 y=10.186 it was continuous, but they wanted it rounded to three decimal places
*August 26, 2012*

**algebra**

i changed it too f(1.9)= 10.186 f(1.5)= -2.344
*August 26, 2012*

**algebra**

use the intermediate value theorem to show the polynominal function has a zero in the given interval f(x)=x^5-x^4+3x^3-2x^2-11x+6; [1.5,1.9] x= -2.33 y=10.19 after i plugged in the 1.5 and 1.9 i just want to know if my x and y are correct
*August 26, 2012*

**trig**

given cot-A square root of 5, find cot-B at the 4th quadrant.
*June 23, 2012*

**calculus**

An airplane's velocity with respect to the air is 580 miles per hour, and its bearing is 332 degrees. The wind, at the altitude of the plane, is from the SW and has a velocity of 60 mph. What is the true direction of the plane, and what is the speed with respect to the ...
*May 24, 2012*

**geology**

during glacier ice ages, sea level rises or falls?
*May 23, 2012*

**calculus**

A plane flies 810 miles from A to B with a bearing of 75 degrees. Then it flies 648 miles from B to C with a bearing of 32 degrees. Find the straightline distance from and bearing from C to A.
*May 15, 2012*

**calculus**

A pole at a right angle to the horizontal is located on a slope that makes an angle of 12 degrees with the horizontal. The pole's shadow is 16 meters long and points up the slope. The angle of elevation from the tip of the shadow to the sun is 20 degrees. What is the ...
*May 9, 2012*

**calculus**

Verify the identity: (tanx+1)/(secx+cscx) = sinx
*May 2, 2012*

**Chemistry**

Never mind I got it, just divide by the other ml amount :)
*March 18, 2012*

**Chemistry**

Sorry the question is What is the molarity of this AgNO3(aq)?
*March 18, 2012*

**Chemistry**

A 25.00 mL sample of a clear saturated solution of PbI2 requires 14.3 mL of a certain AgNO3(aq) for its titration. I^-(from satd PbI2)+ Ag^+(from AgNO3)= AgI(s) So, this is where I am. using the Ksp equation for PbI2: 7.1*10^-9=4x^3 solving for x gives me 0.00121 Giving the ...
*March 18, 2012*

**geometry**

a school playground is in the shape of a rectangle 500 feet long and a 100 feet wide if fencing cost 15 dollars per yard what will the cost be to place fencing around the playground ?
*March 1, 2012*

**physics**

a bus is moving downhill at a slope of 5 degree . at the moment when the speed of the bus is 30km/h,the driver spots a deer 30m ahead. he applies the brakes and comes to a stop. the is paralysed by fear and does not move.will the bus stops before reaching it or will it hit the...
*February 11, 2012*

**physics**

a plane is flying with a constant speed along a straight line at an angle 60degree with the horizontal. the weight(W) of the plane is 90,000N and its engine provides a thrust(T)of 120,000N in the direction of flight . two additional forces are exerted on the plane :the lift ...
*February 11, 2012*

**physics**

an airplane has a speed of 600km/h with respect to air. it has to fly a distance of 800km northward. in what direction should it fly if a steady wind is blowing at a speed of 120km/h from the west ? what will its speed with respect to the ground be? draw the relevant diagram ...
*February 11, 2012*

**chemistry**

How many grams of mercury are formed from 47.0 of HgO? How many grams of oxygen are formed from 47.0 of HgO? How many grams of HgO would you need to obtain 34.1 of O2?
*February 7, 2012*

**chemistry**

What mass of oxygen is needed for the complete combustion of 2.50×10−3 of methane?
*February 7, 2012*

**chemistry**

What mass of water is produced from the complete combustion of 2.50×10−3 of methane?
*February 7, 2012*

**chemistry**

What mass of carbon dioxide is produced from the complete combustion of 2.50×10−3 of methane?
*February 7, 2012*

**chemistry**

A scientist wants to make a solution of tribasic sodium phosphate,Na3PO4 , for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 550 ml of a solution that has a concentration of Na+ ions of 1.40M ?
*February 7, 2012*

**Chemistry**

1.29g H2 is allowed to react with 10.3g N2 , producing 1.86g NH3. What is the theoretical yield for this reaction under the given conditions? What is the percent yield for this reaction under the given conditions? I have been stucks for days now.
*February 7, 2012*

**Geometry**

Find the area of a regular pentagon with a side of 6ft. Give the answer to the nearest tenth. 123.9ft2 49.5ft2 61.9ft2 12.4ft2
*January 23, 2012*

**Geometry**

Find the surface area of a conical grain storage tank that has a height of 42 meters and a diameter of 20 meters. Round the answer to the nearest square meter. 3,028m2 3,971m2 1,357m2 1,671m2
*January 23, 2012*

**Geometry**

Find the surface area of a sphere with a circumference of 40 ft. Round to the nearest tenth.
*January 23, 2012*

**precalc help**

cos(15degrees) this is not plugging it in the calculator, please help me right down steps. i really need help.
*January 23, 2012*

**Geometry**

Cylinger A has a radius of 1 m and a height of 4 m. Cylinder B has a radius of 2 m and a height of 4 m. Find the ratio of the volume of cylinder A to the volume of cylinder B. 5:6 1:4 1:2 1:1
*January 21, 2012*

**Geometry**

Find the surface area of a conical grain storage tank that has a height of 42 meters and a diameter of 20 meters. Round the answer to the nearest square meter. 3,028m2 3,971m2 1,357m2 1,671ma
*January 21, 2012*

**Geometry**

The volume of a sphere is 2,098pi m3. What is the surface area of the sphere to the nearest tenth? 1,700 m2 146.2 m2 850 m2 26,364 m2
*January 21, 2012*

**Geometry**

Find the similarity ratio of a cube with a volume 512 m3 to a cube with volume 3,375 m3. 8 : 15 64 : 225 15 : 8 225 : 64
*January 21, 2012*

**Geometry**

What is the equation of the circle with center (2, –5) that passes through the point (–2, 10)? (x – 2)2 + (y – (–5))2 = 25 (x – (–2))2 + (y – 10)2 = 241 (x – 2)2 + (y – (–5))2 = 241 (x – (–2))2 + (y – 10)2...
*January 21, 2012*

**Geometry**

The length of the hypotenuse of a 30°-60°-90° triangle is 7. Find the perimeter. 7/2+21/2sqrt3 21+7sqrt3 7+21sqrt3 21/2+7/25sqrt3
*January 20, 2012*

**Geometry**

Thank you so much this was complicated
*January 20, 2012*

**Geometry**

Kristen lives directly east of the park. The football field is directly south of the park. The library sits on the line formed between Kristen’s home and the football field at the exact point where an altitude to the right triangle formed by her home, the park, and the ...
*January 20, 2012*

**Geometry**

A triangle has side lengths of 18 cm, 80 cm, and 81 cm. Classify it as acute, obtuse, or right.
*January 20, 2012*

**geometry**

The volume of a sphere is 2,098 m3. What is the surface area of the sphere to the nearest tenth? 1,700m2 146.2m2 850m2 26,364m2
*January 12, 2012*

**math**

a school playground is in the shape of a rectangle 700 feet long and 200 feet wide. if fencing cost 20 dollars per yards what will it cost to place fencing around the playground
*January 11, 2012*

**Physics**

(a) From ground, h=2.30m so: PE=mgh =1.70kgx9.8m/sx2.30m = 38.3J (b)The person is shorter than the distance at which he holds the book from the ground so: 2.30-1.60=0.7m Use the same formula, just substitute 0.7 in for h. (c)The work in this case is the potential energy of the...
*December 7, 2011*

**geometry**

The sides of a parallelogram are 25 cms and 15 cms.The height to the 25 cms side is 15 cms.What is the speciality of this parallelogram ?
*November 30, 2011*

**physics**

The drawing shows a boat being pulled by two locomotives through a canal of length 2.50 km. The tension in each cable is 5.00 103 N, and è = 19.0°. What is the net work done on the boat by the two locomotives?
*November 16, 2011*

**math**

there are seven pies if i take away 2 1.3 how many are left
*October 20, 2011*

**English**

those sentences seem great to me. With num 3 use (able). Try also to make your sentences as interesting as possible.
*October 15, 2011*

**Precal**

Use the Law of Sines to solve for all possible triangles that satisfy the given conditions. (If an answer does not exist, enter DNE. Round your answers to one decimal place. Below, enter your answers so that A1 is smaller than A2.)
*October 10, 2011*

**Physics**

30.24m/s
*September 17, 2011*

**Intergrated Algebra**

I kinda forgot about radicals over the summer.What is Radical 79 over 3? How would you plot that?
*September 7, 2011*

**geometry**

find the value of x and bc if b is between c and d cb=4x-9 bd=3x+5 cd=17
*August 30, 2011*

**physics**

A 88-kg astronaut and a 1200-kg satellite are at rest relative to the space shuttle. The astronaut pushes on the satellite, giving it a speed of 0.25m/s directly away from the shuttle. Seven-and-a-half seconds later the astronaut comes into contact with the shuttle.What was ...
*August 20, 2011*