Sunday

May 3, 2015

May 3, 2015

Total # Posts: 1,484

**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*

**Physics**

Two children are playing on two trampolines. The first child can jump one and a half times higher than the second child. The initial speed of the second child is 5 m/s. What is the maximum height of the second child? What is the initial speed of the first child? How long was ...
*October 12, 2014*

**Math **

According to the U.S. Census Bureau's most recent data on the marital status of the 242 million Americans aged 15 years and older, 124.2 million are currently married and 74.5 million have never been married. If one person from these 242 million persons is selected at ...
*October 2, 2014*

**Math**

jason mixed 3/8 cup of sugar with 1 5/6 cups of water. how many more cups of water than sugar did he use in his mixture?
*September 24, 2014*

**chemistry**

Would a substance with a density of 7.89 kg/dm^3 float on a substance that has a density of 14.2 g/ml?
*September 23, 2014*

**Chemistry**

A graduated cylinder contains 56.3ml of water. A metal cylinder is dropped in the water and is completely covered by water. The diameter of the cylinder is 3.8 cm and the height of the cylinder in 5.4cm. What is the volume reading in the graduated cylinder after the cylinder ...
*September 22, 2014*

**Math**

Alice, Bob, and Charlie are three siblings with ages a, b, and c respectively. Their combine age is 18 years. Charlie is older than Bob. Alice's age is equal to twice the difference between Bob's and Charlie's ages. Bob's age is equal the average of Alice's...
*September 22, 2014*

**Chemistry**

The men's marathon world record was in a time of 2hours, 4minutes, and 55 seconds. The standard distance is 26 miles 385 yard. At this pace, what is his speed in miles per hour?
*September 21, 2014*

**trig**

I have arrived at .322 as the sine of the angle how do I find the actual angle (in decimal/deg)
*September 13, 2014*

**income tax**

Kobe is a single dad with two dependent children, Lizzie, age 7 and Leslie, age 3. He has AGI of $51,000 and paid $6,300 to a qualified day care center. What amount of credit can Kobe receive for the child and dependent care credit?
*June 29, 2014*

**physics**

A 370kg piano slides 2.9m down a 24∘ incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. Ignore friction.
*June 9, 2014*

**math**

write a problem with lengths in feet using the numbers 29 and 56. write the answer to your problem.
*May 29, 2014*

**math**

Jane has a piece of wood that is 24 inches long. She uses 6 inches for one project and 9 inches for another project. How much wood does Jane have left?
*May 29, 2014*

**math**

Tyler and Mia join popcorn strings to make a string 84 centimeters. Tyler's popcorn strings is 36 centimeters long. How many is Mia's popcorn string?
*May 29, 2014*

**math**

Logan measures the height of his rose bushes. One rose bush is 35 centimeters tall. Another rose bush measures 39 centimeters tall. How tall are both rose bushes?
*May 29, 2014*

**math**

Tyler and Mia join popcorn strings to make 84 centimeters. Tyler's popcorn string is 36 centimeters long. How long is Mia's popcorn string?
*May 29, 2014*

**math**

Ryan watches 2 bullfrogs jump a total of 39 inches. One bullfrog jumps 22 inches. How far did the second bullfrog jump?
*May 29, 2014*

**math**

Anna has 16 inches of silver lace and 19 inches of gold lace. How much lace does Anna have?
*May 29, 2014*

**Algebra 2**

I still dont understand
*May 29, 2014*

**Algebra 2**

a farmer has 400 meters of fence with which to enclose a portion of land. the farmer wants to enclose a rectangular piece of ground that is as large as possible. the land is bordered by water on two sides. There are three options for the farmer Option 1) have two sides ...
*May 29, 2014*

**math **

Rona bought a length of rope. She cut off 1 meter of rope. Now she has 3 meters of rope. How much rope did Rona buy?
*May 28, 2014*

**math**

Len buys 24 centimeters of blue trim and some gold trim. She buys a total of 54 centimeters of trim. How much gold trim does Len buy?
*May 28, 2014*

**math**

Ray has a board that is 16 feet long. He cuts off 11 feet to make a shelf. What is the length of the board that is left?
*May 28, 2014*

**Calculus**

An inverted conical tank is 3m tall and 1m in diameter at its widest point. The water is being pumped out of a spout 2m above the top of the tank. Recall that the density of water is = 1000kg/m^3 (a) Find the work needed to empty the tank if it is full. Include units. (b...
*May 18, 2014*

**Ethics in Criminal Justice**

Frankly, I don't think ANYTHING justifies convicting an innocent person; but, if I have to choose one, I would choose "B".
*May 15, 2014*

**math**

a parking lot charges $1.50 for the first hour of parking and 55 cents for each additional half hour how much would it cost to park a car from 12:45pm to 6:15 pm
*May 13, 2014*

**7th grade math**

Computer catalog has a computer monitor that is 19 inches. The 19 inches is the diagonal distance across the screen. If the screen is 10 inches in height, what is the width of the screen to the nearest inch?
*May 8, 2014*

**Math**

Two vans leave a parking lot at the exact same time. A few minutes later, car 1 is 8 miles due east of the parking lot and car 2 is 15 miles due south of the lot. How far a part are the two cars in miles?
*May 8, 2014*

**math**

$115
*May 3, 2014*

**statistics (7)**

a) I think the question requires the use of the t-distribution. standard error=statistic/sqrt(45) =65/sqrt(45)=9.689 critical value: df=45-1=44, area=.025 so t=2.015 margin of error=t*SE=19.52 b) Confidence interval: Use t-distr: sample mean +- margin of error =273 +- 19.52 =(...
*April 26, 2014*

**Math (6)**

The lines do intersect. sqrt(x) = x-2 x =(x-2)^2 =x^2-4x + 4 x^2-5x+4=0 (x-1)(x-4)=0 x=1,4 but 1 does not work if you plug in x=1 to both equations, so the only answer is x=4.
*April 26, 2014*

**Chemistry**

.708=(0.5)^(4.00/half life) Take log on both sides and rearrange equation to solve for half life. -.150=(4.00/half life)*-.301 (4.00/half life)=.498 half life = 8.03 min
*April 26, 2014*

**Math**

Tom made 2 pans of lasagna and cut each pan into twelfths. His family ate 1 1/12 pans of lasagna for dinner. How many pans of lasagna were left?
*April 24, 2014*

**business**

When creating a data set, historical costs should be:
*April 9, 2014*

**Calculus Help**

The County Roads Department is stockpiling salt for use next winter. The salt is being unloaded from railroad cars by a conveyor belt at a rate of 20 cubic feet per minute. The salt falls into a conical pile whose diameter at the base is four times the height of the pile. At ...
*April 7, 2014*

**Calculus Help**

find dy/d(theta) theta=2 , if y=sin(pi/(square root(theta^2+5))) Show steps thanks!!!
*April 7, 2014*

**organic chemistry**

For proton NMR spectra, does a peak at 0 ppm indicate anything significant or is it likely to be a signal arising from a solvent?
*April 7, 2014*

**Calculus Help Please!!! **

find the derivative of the function. Simplify where possible. F(theta)=arcsin(square root of (sin9(theta)))
*March 20, 2014*

**Math**

If there are 6 red tiles and 5 blue tiles in a box, what are the chances that you will pick a red tile without looking?
*March 5, 2014*

**math**

Anthony wishes to sell a $5,000 fixed-rate bond with a 3% coupon. The bond has two years left to maturity. What is the most money this bond could be worth?
*March 3, 2014*

**algebra**

Is the following inequality always,sometimes,never,true,2(8x-4)-2 x<14x+12 thank you
*February 25, 2014*