# Posts by Becca

Total # Posts: 373

**Pre-calculus; urgent ! Please help !**

1.Graph the polar equation r=3-2sin(theta) 2. Find the polar coordinates of 6 radical 3,6 for r > 0. 3. Find the rectangular coordinates of (7, 30°). 4. Write the rectangular equation in polar form. (x – 4)2 + y2 = 16 5. Write the equation –2x + 6y = 7 in ...

*February 26, 2013*

**Calculus please help !**

1.Graph the polar equation r=3-2sin(theta) 2. Find the polar coordinates of 6 radical 3,6 for r > 0. 3. Find the rectangular coordinates of (7, 30°). 4. Write the rectangular equation in polar form. (x – 4)2 + y2 = 16 5. Write the equation –2x + 6y = 7 in ...

*February 26, 2013*

**Math ! Please Help !**

1.Graph the polar equation r=3-2sin(theta) 2. Find the polar coordinates of 6 radical 3,6 for r > 0. 3. Find the rectangular coordinates of (7, 30°). 4. Write the rectangular equation in polar form. (x – 4)2 + y2 = 16 5. Write the equation –2x + 6y = 7 in ...

*February 26, 2013*

**Thermodynamics**

The initial state consists of a closed system containing one mole of super-heated liquid water at 115°C and 1 atmosphere pressure. The immediate surroundings are also at 115°C and 1 atmosphere pressure. The change in state is described as this one mole of super-heated ...

*February 23, 2013*

**Calculus please help !**

Find the inner product of a and b if a= (3, 0, –1) and b= (4, –2, 5), and state whether the vectors are perpendicular.

*February 20, 2013*

**Math ! Please Help !**

Find the inner product of a and b if a= (3, 0, –1) and b= (4, –2, 5), and state whether the vectors are perpendicular.

*February 20, 2013*

**Pre-calculus; urgent ! Please help !**

Find the inner product of a and b if a= (3, 0, –1) and b= (4, –2, 5), and state whether the vectors are perpendicular.

*February 20, 2013*

**Math**

1. A triangular prism has vertices at A(2, 0, 0), B(2, 1, 3), C(2, 2, 0), D(0, 0, 0), E(0, 1, 3), and F(0, 2, 0). Which image point has the coordinates (1, 4, 3) after a translation using the vector 1, 2, 3? 2. What point represents a reflection of B over the xy-plane? B'...

*February 20, 2013*

**Calculus**

oh my goodness, that was so helpful! Thankyou :) i think i got them all!

*February 20, 2013*

**Calculus**

1. A triangular prism has vertices at A(2, 0, 0), B(2, 1, 3), C(2, 2, 0), D(0, 0, 0), E(0, 1, 3), and F(0, 2, 0). Which image point has the coordinates (1, 4, 3) after a translation using the vector 1, 2, 3? 2. What point represents a reflection of B over the xy-plane? B'...

*February 20, 2013*

**Math**

1. A triangular prism has vertices at A(2, 0, 0), B(2, 1, 3), C(2, 2, 0), D(0, 0, 0), E(0, 1, 3), and F(0, 2, 0). Which image point has the coordinates (1, 4, 3) after a translation using the vector 1, 2, 3? 2. What point represents a reflection of B over the xy-plane? B'...

*February 20, 2013*

**Pre-calculus**

1. A triangular prism has vertices at A(2, 0, 0), B(2, 1, 3), C(2, 2, 0), D(0, 0, 0), E(0, 1, 3), and F(0, 2, 0). Which image point has the coordinates (1, 4, 3) after a translation using the vector 1, 2, 3? 2. What point represents a reflection of B over the xy-plane? B'...

*February 20, 2013*

**Pre-calculus**

Jana hit a golf ball with an initial velocity of 102 feet per second at an angle of 67° with the horizontal. After 2 seconds, how far has the ball traveled horizontally?

*February 19, 2013*

**Math**

What is 2.49 divided by 89?(BTW im not cheating im just having trouble checking my answers

*February 12, 2013*

**science**

Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in ...

*February 6, 2013*

**business**

describe how a manager would use the critical-incident appraisal method for assessing an employee?

*February 5, 2013*

**Algebra**

I need some help figuring these. Compute each product and simplify the result. I don't have the squareroot sign so put that meaning that's where it goes with the number after it. 1. (0.3 Squareroot of 5)^2 2. (2+ squareroot of 5)^2 3. (5+4Squareroot of 10)(1-2 ...

*January 18, 2013*

**Algebra**

Rationalize each expression by building perfect nth root factors for each denominator. Assume all variables represent positive quantities. I don’t understand how to compute these. Also I don’t have the square root sign so I typed it out where it would be and the ...

*January 18, 2013*

**Algebra**

I need some help figuring these. Compute each product and simplify the result. I don't have the squareroot sign so put that meaning that's where it goes with the number after it. 1. (0.3 Squareroot of 5)^2 2. (2+ squareroot of 5)^2 3. (5+4Squareroot of 10)(1-2 ...

*January 18, 2013*

**7th grade math Ms. Sue please**

for the people saying not to cheat , why come on this website just to tell people not to cheat , huh ? you're cheating too

*January 2, 2013*

**english**

When I called the college, they said they were still accepting applications.

*December 14, 2012*

**Math, need help asap**

The ramp shown below is used to move crates of fruit to loading docks of different heights. When the horizontal distance AB is 12 meters, the height of the loading dock, BC, is 4 meters. What is the height of the loading dock DE? 12 m 8 m 9 m 15 m

*December 14, 2012*

**chem 101**

^^disregard my answer! I posted to the wrong question ... I'm so sorry

*December 6, 2012*

**chem 101**

2.95kg X 1000g/1kg x 1 mol/74.14g x 7.27kJ/1mol =289.2702 kJ = 2.89 x 10^2 kJ

*December 6, 2012*

**Statistics**

FALSE... Sorry Math Guru. Conditions for a regression analysis are We have n observations on an explanatory variable x and a response variable y. Our goal is to study or predict the behavior of y for given values of x. For any fixed value of x, the response varies according to...

*November 6, 2012*

**Physics**

A 69 kg swimmer free-falls off a 10.0 m diving platform. The diver comes to a stop 2.7 m below the water's surface. What is the magnitude of the force exerted by the water on the swimmer. (assume a positive direction is up) I calculated the force on the diver before they ...

*October 24, 2012*

**Physics**

A 69 kg swimmer free-falls off a 10.0 m diving platform. The diver comes to a stop 2.7 m below the water's surface. What is the magnitude of the force exerted by the water on the swimmer. (assume a positive direction is up) I calculated the force on the diver before they ...

*October 24, 2012*

**physics**

The maximum speed of a child on a swing is 4.90 m/s. The child's height above the ground is 0.525 m at the lowest point in his motion. How high above the ground is he at his highest point?

*October 10, 2012*

**7th grade health question**

1. eat nutrient dense food 2. a 3. b 4. d (pee goes through the urethra 5. a

*October 10, 2012*

**AP Environmental Science**

Consider the following heats, copper: 0.384J/g degrees, glass:0.502J/g degrees, water: 4.18J/g degrees, and lead:0.159J/g. Which substance once warmed, would be more likely to maintain its heat and keep you warm through a long party on a cold night?

*October 10, 2012*

**math**

how do u reduce 8 gal 9pt

*October 7, 2012*

**Biology**

some proteins (such as HBB) can vary quite a bit from species to species. others (ex., tubulin) vary little from species to species? Why?

*September 27, 2012*

**Physics**

Bob, Im not getting the same answer when i do plug in the H into finding the height of the apples and oranges

*September 16, 2012*

**Physics**

Wes and Lindsay stand on the roof of a building. Wes leans over the edge and drops an apple. Lindsay waits, 1.25s afrer Wes releases his fruit and throws an orange straight down at 28 m/s. Both pieces of fruit hit the ground simultaneously. Calculate the common height from ...

*September 16, 2012*

**Scirnce/ math**

If a pinecone was thrown from a height of 45 meters and hit the ground 4.5 seconds later, how fast was the pinecone traveling

*September 9, 2012*

**Chemistry**

How do you figure out how mch oxygen gas escaped when Potassium Chlorate is decomposed in a reation? Also what mass of Potassium Chlorate was decomposed in the experiment? I conducted the experiement but don't know how to do this.

*September 3, 2012*

**cild care**

its not c or b

*July 23, 2012*

**algebra**

if 2k - 4 = 8, then k is what

*July 16, 2012*

**math**

Ben rolls a standard number cube (sides labeled with numbers 1 through 6). Find the probability that Ben rolls a number greater than 2 or an even number.

*July 3, 2012*

**Math**

okay so im doing homework and don't understand how to do it the question is -2 2/3+ d/6= 2/3 the little slash things are fraction things

*May 20, 2012*

**Calculus**

idk what that is hehe

*May 20, 2012*

**Poli sci**

d) Cabinet secretaries

*May 10, 2012*

**Geometry**

(1)Is a trapezoid a square? false (2) if all sides of a quadilateralare congruent,the quadilateral is a rhombis? true or false

*April 8, 2012*

**math**

Preform the operation and write in standard form: (8+20i)/(2i)

*April 3, 2012*

**APWH**

thesis: How did the World Wars of the 20th century demonstrate the application of “total war?”

*March 29, 2012*

**APWH**

thesis: How did the World Wars of the 20th century demonstrate the application of “total war?”

*March 29, 2012*

**chemistry**

I understand you are supposed to separate into half reactions and balance using H20 H+ and e- however, when i start doing that I get confused halfway through. this is as far as I have gotten: 4e- + 7H+ + Cr2O72- = 2Cr3+ +7H20 2Sn2+ = 2Sn4+ +4e- then cancel electrons...is this ...

*March 22, 2012*

**chemistry**

When the following reaction is balanced in acid solution, the coefficient of H+(aq) will be: Cr2O72-(aq) + Sn2+(aq) --> Cr3+(aq) + Sn4+(aq)

*March 22, 2012*

**algebra**

triangle 1 is 6,16,32 triangle 2 is 9,24 h they are similar how do i find h?

*March 12, 2012*

**koko**

how did you come up with 29? Need help bad please anyone

*March 6, 2012*

**Math help**

If a trend line had the equation: y=x+9 what y value would you expect to obtain when x is 20??

*March 6, 2012*

**math**

what are the odds in favor of randomly drawing the letter m from the letters in the word remember? would it be 2 out of 8 would you simplify it to 1 out of 4??? help

*March 6, 2012*

**Language Arts EnglishIII**

Identify the pronoun in the sentence below. Also identify the class and noun function of the pronoun using the abbreviations from the chart. For intensive pronouns, put NONE for noun function. Due to the large storm approaching, three students, Jamie, Lisa, and I, were allowed...

*March 1, 2012*

**Calculus**

integrate: (square root of (y^2 -121))/y dy, y>11. I got (12(square root of (y^2-121))/12 -sec^-1 (y/12) +C but it's not right. I'm not sure where I am going wrong.

*February 23, 2012*

**math**

sin^2x+sin^2tan^2x=tan^2x

*February 20, 2012*

**chemistry**

When 26 mL of a 120 mL stock solution containing 3.23 M CaF2 is diluted to 35 mL, how many moles of F- are in the new solution

*February 16, 2012*

**chemistry**

When 26 mL of a 120 mL stock solution containing 3.23 M CaF2 is diluted to 35 mL, how many moles of F- are in the new solution

*February 16, 2012*

**Chemistry/Engineering**

A 25 gram sample of CT is vaporized and used to fill a 5 L container. If the pressure in the container is 1.2 atm at 27 degrees Celsius, what is the molecular weight of CT in grams per mole? I used PV=nRT and found n=.2437 mol, but how do I got to grams per mole? CT is a made-...

*February 14, 2012*

**Chemistry**

At what temperature would 1.3 m NaCl freeze, given that the van't Hoff factor for NaCl is 1.9? Kf for water is 1.86 deg C/m.

*February 5, 2012*

**Chemistry**

At a certain temperature, the solubility of N_2 gas in water at 2.38 atm is 56.0 mg of N_2 gas/100 g of water. Calculate the solubility of N_2 gas in water, at the same temperature, if the partial pressure of N_2 gas over the solution is increased from 2.38 atm to 5.00 atm.

*February 4, 2012*

**Calculus**

Find the volume of the solid whose base is the region bounded by y=x^2 and the line y=0 and whose cross sections perpendicular to the base and parallel to the x-axis are semicircles.

*January 29, 2012*

**Calculus**

I use this to check my answers. I apologize for not realizing that I should have proven to you that I was doing them by myself at first.

*January 29, 2012*

**Calculus**

Find the volume of the solid formed when the region bounded by y=3x^2 and y=36-x^2 is revolved about the x-axis.

*January 29, 2012*

**Calculus**

Let R be the region bounded by y=x^2, x=1, and y=0. Use the shell method to find the volume of the solid generated when R is revolved about the line x=-11.

*January 29, 2012*

**Calculus**

Let R be the region bounded by y=x^2, x=1, and y=0. Use the shell method to find the volume of the solid generated when R is revolved about the line y=-2.

*January 29, 2012*

**Biology/Chemistry**

Consider that the human brain weighs about 1 kg and contains 10^11 cells. Assuming that each cell is entirely filled with water, and knowing that 1 cm^3 of water weighs 1 g, calculate the volume of a brain cell (in picoliters).

*January 26, 2012*

**Chemistry**

A sample of steam with a mass of 0.550 g and at a temperature of 100 degrees C condenses into an insulated container holding 4.40 g of water at 5.0 degrees C. Assuming that no heat is lost to the surroundings, what will be the final temperature of the mixture?

*January 25, 2012*

**quadratic equations**

Thank you Steve, your a life saver,and I appreciate your help!!!

*January 24, 2012*

**quadratic equations**

Suppose you are an event coordinator for a large performance theater. One of the hottest new Broadway musicals has started to tour and your city is the first stop on the tour. You need to supply information about projected ticket sales to the box office manager. The box office...

*January 24, 2012*

**Calculus**

Find the volume of the solid generated by revolving the following region about the given axis. The region in the first quadrant bounded by the curve y=x^2, below by the x-axis, and on the right by the line x=1, about the line x=-2

*January 24, 2012*

**Calculus**

Use the disk method to find the volume of the solid generated when the region bounded by 4= 1/(fourth root of (1-11x)), y=0, x=0, and x=1/22.

*January 24, 2012*

**Calculus**

Use the disk method to find the volume of the solid generated when the region bounded by y=15sinx and y=0, for 0 </= x </= pi, is revolved about the x-axis.

*January 24, 2012*

**Chemistry**

Sorry, I never saw this response so I reposted it correctly! But I do have a question. I used 2257 kJ/kg for the heat vap. and 2.08 J/g*K for the specific heat of water. I'm still getting the problem wrong, am I plugging in the wrong numbers??

*January 24, 2012*

**Chemistry**

It is 100 degrees, I just mistyped!!

*January 24, 2012*

**Chemistry**

A sample of steam with a mass of .550 g and at a temperature of 1 degrees C condenses into an insulated container holding 4.40 g of water at 5.0 degrees C. Assuming that no heat is lost to the surroundings, what will be the final temperature of the mixture?

*January 24, 2012*

**chemistry**

How much energy (in kJ) is released when 16.4 g of steam at 121.5 degrees C is condensed to give liquid water at 60.5 degrees C? The heat of vaporization of liquid water is 40.67 kJ/mol and the molar heat capacity is 75.3 J/(K*mol) for the liquid and 33.6 J?(K*mol) for the vapor.

*January 24, 2012*

**algebra**

I need help breaking down the steps to solve HELP ME PLEASE solve with an exact answer. x^2 + 2x - 8

*January 17, 2012*

**Quadraitic equations**

Thank you so much and I definetly need to review how to factor equations<<<good night and sweet dreams>>>thank you for helping me

*January 17, 2012*

**Quadraitic equations**

Can you show me the steps please???? to solve this equation.

*January 17, 2012*

**Quadraitic equations**

solve with an exact answer. x^2 + 2x - 8

*January 17, 2012*

**quadratic equations**

can you solve the equation using the quadratic formula x2 + 3x = 7? Explain and provide an exact answer.

*January 17, 2012*

**algebra**

Thanks

*January 17, 2012*

**algebra**

a two part canoe trip,the first part of the trip the canoist traveled 58 miles.Second part of the trip he traveled 18 miles at 5mph slower.the total time for trip was 4 hours.What was the speed of both parts of the trip?

*January 17, 2012*

**algebra**

Thank you!

*January 17, 2012*

**algebra**

solve by completing the square x^2-10x=10

*January 17, 2012*

**calculus**

find the slope of the tangent line at the point P(1,1) on the graph of e^x-y=2x^2-y^2

*January 17, 2012*

**calculus**

An airplane flying west at 300 miles per hour goes over the control tower at noon, and a second airplane at the same altitude, flying north at 400 miles per hour, goes over the tower an hour later. How fast is the distance between the airplanes changing at 2:00 P.M.?

*January 17, 2012*

**Algebra**

REMOVING FACTOR OF 1: 4Z-24/6-Z

*December 17, 2011*

**Algebra**

The cost, in millions, to remove x% of pollution in a pond is modeled by the equation: C=6350/(425-3x) . What is the cost to remove 75% of the pollution? Hint: Plug in and calculate, do not convert to a decimal. Can someone tell me how figure this out step by step recheck my ...

*December 15, 2011*

**Algebra**

1.50 per animal. 2200.00 for set-up and 1,50 per animal ??? are you sure your right???

*December 14, 2011*

**Algebra**

Opps I think the other one was wrong so here's my new answer: (2200 + 1.5x)=1.5*25+$2,200 =$2,237.50

*December 14, 2011*

**Algebra**

Scientists want to set up and test animals in the area for West Nile. The costs to test are $2,200 for setup plus $1.50 to administer each test. (2200 + 1.5x)/x What is the average cost to test 25 animals?250 animals??1000 animals??? (2200 + 1.5x)=2201.50 *25 =2239.00 Is this ...

*December 14, 2011*

**Algebra**

, what value of x would make the equation undefined? Hint: Think about what makes an equation undefined. Then calculate what value would make this equation undefined. Any ideas????? help

*December 14, 2011*

**Algebra**

The cost, in millions, to remove x% of pollution in a pond is modeled by the equation: C=6350/(425-3x) What is the cost to remove 75% of the pollution? Plug in and calculate, do not convert to a decimal.

*December 14, 2011*

**Algebra**

HELP!!!!!!!If 59 people use 15,045 cans in 1 year. How maNY CANS are used in a city with a population of 1,562,000???

*December 13, 2011*

**chemistry**

2H2 (g) O2 (g) --> 2H2O (g) if 44 g of O2 are reacted , determine the amount if heat transferred in the reaction when the Heat = -483.6 kJ

*December 12, 2011*

**chemistry**

2H2 (g) O2 (g) --> 2H2O (g) if 44 g of O2 are reacted , determine the amount if heat transferred in the reaction when the Heat = -483.6 kJ

*December 12, 2011*

**physiology**

Pepsin would have the greatest activity... a.)when the pH of the chyme is greater than 3. b.)immediately upon entering the duodenum. c.)immediately upon secretion into the stomach. d.)when the pH of the chyme is less than 3.

*December 10, 2011*

**physiology**

True or False The secretion of GnRH, FSH, and LH are pulsatile instead of continuous?

*December 4, 2011*

**physics**

A propeller spins at 1850 rev/min. (a) What is the angular velocity in rad/s? (b) What is the angular displacement of the propeller in 4.10 s?

*November 28, 2011*