Friday

October 24, 2014

October 24, 2014

Total # Posts: 1,528

**Help math!!**

15 students took a science test. the average score was 88.0. later in the day a sixteenth student took the same test and scored a 92. the teacher recalculated the class average using all 16 of the scares. by how much will the class average have increased? show your work.
*April 10, 2013*

**chemistry**

assume all of the ionized aspirin remains in the buffer solution and all of the un-ionized aspirin goes into to the ethyl acetate, what is the molarity of the aspirin in the ethyl acetate at pH 2 and pH 8? what equation would ou use for this?
*April 3, 2013*

**Math**

if kelly gave 1/3 of a pizza to holly and 1/5 to diane how much did she have left
*April 2, 2013*

**calculus**

Find an equation of the tangent line to the curve at the given point. y^2=x^3 (2-x) (1,1)
*March 25, 2013*

**Physics**

A man seeking to set a world record wants to tow a 122000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 95 kg, and the coefficient of static friction between his shoes and the runway is 0.74. What is the greatest...
*March 20, 2013*

**Physics**

A rescue helicopter is lifting a man (weight = 797 N) from a capsized boat by means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acceleration of 0.711 m/s2? (b) What is the tension during the remainder of the rescue when ...
*March 20, 2013*

**Physics**

A stuntman is being pulled along a rough road at a constant velocity by a cable attached to a moving truck. The cable is parallel to the ground. The mass of the stuntman is 110 kg, and the coefficient of kinetic friction between the road and him is 0.825. Find the tension in ...
*March 20, 2013*

**Chemistry**

I figured it out. Nevermind.
*March 17, 2013*

**Chemistry**

For the reaction: 2HCl + Na2CO3→ 2NaCl + H2O + CO2 how much CO2 is produced at STP if 18.5 L of 1.15 M Na2CO3is used? The molar mass of Na2CO3is 106.01 g/mol. I know I have to use stoichiometry and possibly PV=nRT but I don't know what to use first. Do I start with ...
*March 17, 2013*

**ethical/unethical**

unethical because one's body is used for experimentation oppose to being used for medical reason- does not value the person as in human being that once lived
*March 12, 2013*

**ethical/unethical **

Is it ethical/unethical to use human cadavers to test out weapons and used them as crash test dummies?
*March 12, 2013*

**stats**

yes I used it against the alpha level .05 of the z score +/- 1.96 so I reject because it is less than stating that those who consumed salty foods didn't have an significant impact on whether the intake of salt affects weight
*March 12, 2013*

**stats**

So I have the mean as 162.5 and standard deviation 18.86 standard error =s/square root n =18.86/12= 5.44 t=m-mean/standard error = 150-162.5/5.44= -2.29 So we fail to reject Ho
*March 12, 2013*

**stats**

So I will have to find the mean and standard deviation of the sample. Then how will I set up the hypothesis to begin running the test
*March 12, 2013*

**stats**

Here's the rest of the data 155 160 150 145 200 155 190 140 170 175 142 168
*March 12, 2013*

**stats**

Which test should be used one samples t test, independent samples t test or dependent samples t test You may have heard that eating salt can influence people’s weight. Assume that the normal weight of 20-year-old females is 150 pounds. You obtain a sample of 20-year-old ...
*March 12, 2013*

**stats**

Which test should be used one samples t test, independent samples t test or dependent samples t test You may have heard that eating salt can influence people’s weight. Assume that the normal weight of 20-year-old females is 150 pounds. You obtain a sample of 20-year-old ...
*March 12, 2013*

**science**

for scientific research
*March 6, 2013*

**science**

is the use of cadavers a positive thing for society
*March 6, 2013*

**math**

A motorcycle leaves colorado springs, colorado, traveling north on I25 at an average speed of 47 mph. one hour later, a car leaves colorado springs, traveling south on I-25 at an average speed of 54 mph. How long after the motorcycle leaves will it take until they are 52 miles...
*March 5, 2013*

**stats**

so I will found my mean for this set by adding up all the data points and divide by 5
*March 5, 2013*

**stats**

which test to use One-sample or independent samples t-test? A researcher tests five individuals who have seen paid political ads about a particular issue. These individuals take a multiple-choice test about the issue in which people in general (who know nothing about the issue...
*March 5, 2013*

**Accounts**

You notice that your accounts receivable days outstanding has doubled in the first 6 months. Do you give someone a bonus or put him or her on probation? Why?
*March 5, 2013*

**calculs**

If f(3) =4 g(3)=2 f'(3)=6 and g'(3)=5 find the following numbers a) (fg)' (3) b) (f/g)' (3)
*February 28, 2013*

**Physical Science**

Find the change in the force of gravity between two planets when their masses remain the same but the distance between them is increased by 10 times.
*February 27, 2013*

**chemistry**

I need to find the radius of a cylinder with only the following info: Cylinder height=125um There is 1 C atom/0.01848 nm^2 There are 5.75x10^10 C atoms on the surface of cylinder Use quadratic formula to solve
*February 26, 2013*

**language arts**

I want a compostion on the moon
*February 26, 2013*

**math**

In Chicago, the tax on a property assessed at $550,000 is $7,700. If tax rates are proportional in this city, how much would the tax be on a property assessed at $920,000? write a proportion to solve the question.
*February 25, 2013*

**math**

If Kimberly walks 5 miles in 40 minutes, then Kimberly will walk how far in 110 minutes?
*February 25, 2013*

**math**

To be eligible for a car loan, Melissa's monthly rent and utilities cannot exceed 30% of her take-home pay. Use the information below to determine whether Melissa is eligible for the loan. Gross paycheck-$3950 Net paycheck (after taxes)-$3260 Rent-$925 Utilities-$150
*February 25, 2013*

**math**

After dinner, Amanda, Trey and John received the check for their meal. Trey is paying 1/4 of the check and leaving no tip. Amanda is paying the remainder of the check. John is leaving 20% of the check as a tip. Using C as the amount of the check, match each person with an ...
*February 25, 2013*

**math**

The United States Department of Agriculture reports that 15% Americans are now on food stamps. If there are about 300 million Americans, how many millions of people are on food stamps?
*February 25, 2013*

**math**

Vicki is contemplating consolidating her federal student loans with Loan Consolidation Experts Inc. She currently pays five separate federal loans totaling $30,000 in principal at 4.5% simple interest for 20 years. Loan Consolidation Experts Inc. is offering to consolidate ...
*February 25, 2013*

**math**

Sonja needs to borrow $2,251 to pay for her college classes. Sallie Mae is offering her a 4.5% simple interest loan with an interest charge of $405.18 over the life of the loan. How many years is Sallie Mae giving her to pay back the loan with interest?
*February 25, 2013*

**math**

According to a USA Today Gallup poll, there is a racial divide on views of the Trayvon Martin/George Zimmerman case in Sanford, FL. The poll showed that 73% of blacks polled believe George Zimmerman would have been arrested if Trayvon Martin was white, while 771 of 2,334 ...
*February 25, 2013*

**math**

Isaiah and Chakshu went to dinner at Chili's restaurant and received a bill for $35. Isaiah paid the bill along with an additional 20% tip on his charge card. What was the total amount that he put on his charge card?
*February 25, 2013*

**math**

In March of 2012, GM reported a 12% increase in number of vehicles sold compared to March of 2011. If the total number of vehicles sold by GM in March of 2012 was 231,000, how many vehicles were sold in March of 2011?
*February 25, 2013*

**math**

Vicki is contemplating consolidating her federal student loans with Loan Consolidation Experts Inc. She currently pays five separate federal loans totaling $30,000 in principal at 4.5% simple interest for 20 years. Loan Consolidation Experts Inc. is offering to consolidate her...
*February 25, 2013*

**math**

The American flag has a width of 15 feet and a length of 5 feet less than twice the width. Determine the amount of square feet of fabric required to make an American flag?
*February 25, 2013*

**math**

The Bermuda Triangle, known for its disappearance of ships since 1950, has a base between Miami and Puerto Rico, which is about 1000 miles. Its height is between the Bahamas and Bermuda, which is also about 1000 miles. Find the area covered by the Bermuda Triangle.
*February 25, 2013*

**math**

Carpet sells for $2 per square foot. It will cost you $360 to recarpet your room. If your room is 20 feet long, how many feet wide is it?
*February 25, 2013*

**math**

he dimensions of Liz's desk are 3.2 feet wide and 4.6 feet long. Match the description on the left with the appropriate calculation. Length Width Perimeter Area No match CHOICES: A) 15.6 feet B) 4.6 feet C.) 14.72 sq. feet D). 15.6 sq. feet E). 3.2 feet
*February 25, 2013*

**math**

In order for you to put down new sod in the front yard you will need 5400 pieces of sod. Each sod piece is cut into one foot squares. If your yard is 60ft wide , how long is the yard.?
*February 25, 2013*

**math**

My new TV has a perimeter of 164 inches. Its width is 8 inches less than twice the height. How many inches wide is the TV?
*February 25, 2013*

**math**

A gardener wants to use 62 feet of fencing to enclose a rectangular shaped garden. If its length is 4 feet longer than twice its width, find the width of the garden
*February 25, 2013*

**math**

Myra's bulletin board has a width of 60 inches. When she originally decorated it she needed 192 inches of border material. How many inches high is the bulletin board?
*February 25, 2013*

**math**

A football field is 120 yards long and 53 yards wide. How much fencing is needed to enclose the field?
*February 25, 2013*

**Calculus**

F(x) = 2√(1 + tanx) f'(x) 2√ = x^(1/2)
*February 23, 2013*

**math**

-5x^2+5y^3 x=-5, y=-3
*February 21, 2013*

**math**

1/4y-8=1/7y solve for y.
*February 21, 2013*

**math**

1/3y-9=1/10y solve for y.
*February 21, 2013*

**math**

5/6x-1=-6 solve for x.
*February 21, 2013*

**math**

1/3x+1/4=5 solve .
*February 21, 2013*

**math**

Eight subtracted from six times a number is -134. What is the number? A) Translate the statement above into an equation that you can solve to answer this question. Do not solve it yet. Use x as your variable. solve for x
*February 21, 2013*

**math**

14x=5 solve for x
*February 21, 2013*

**math**

A car rental company charges $280 per week plus $0.18 per mile to rent a car. How many miles can you travel in one week for $433? A) Write an equation you can use to answer this question. Be sure all the numbers given above appear in your equation. Use x as your variable. B...
*February 21, 2013*

**Chemistry**

If calcium carbide has a standard enthalpy of formation of -59.8 kJ/mol and acetylene has a standard enthalpy of formation of 226.73 kJ/mol, what is the standard enthalpy change for the reaction?
*February 20, 2013*

**math**

The supplement of angle z is 120 degrees what is the complement of angle z?
*February 20, 2013*

**CALCULUS**

FIND THE DERIVATIVE OF THE FUNCTION f (x) = 10e^x
*February 20, 2013*

**CALCULUS**

FIND THE DERIVATIVE OF THE FUNCTION f (x) = 10e^x
*February 20, 2013*

**organic chem**

Why are we deprotonating the carboxylic acid that is initially dissolved in the dichloromethane? By deprotonating the carboxylic acid, it becomes soluble in the aqueous HCl extracting layer. By deprotonating the carboxylic acid, it becomes soluble in the aqueous NaOH ...
*February 15, 2013*

**english **

right now people who cant breathe (or read warnings)are bumming cigarettes. what message or important comment does the right now comment appear to be making?
*February 13, 2013*

**statistics**

The mean scale score on the mathematics examinatin of ninth graders in Texas was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probability tht his score was 91 or higher
*February 10, 2013*

**statistics**

The mean scale score on the mathematics examinatin of ninth graders in Texas was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probability tht his score was 91 or higher
*February 10, 2013*

**statistics**

The mean scale score on the mathematics examinatin of ninth graders in Texas was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probability tht his score was 91 or higher
*February 10, 2013*

**statistics**

the mean scale score on the mathematics examination of ninth grade students in new york state was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probabilty that his score was 91 or higher?
*February 9, 2013*

**stats**

Why must you square the deviation scores when computing a standard deviation using the definitional formula? Why is the computational formula easier to use when computing variance and standard deviation?
*February 5, 2013*

**stats **

Relatively speaking, which statistics exam did you do better on? On your first statistics exam you scored a 72 and on the second exam you scored an 89. Hey, you’re improving! Or are you? On the first exam, the class mean was 71 with a standard deviation of 15. On the ...
*February 5, 2013*

**Calculator Question**

(ln2)/(5 ln2+ln7) and get 0.128
*February 4, 2013*

**Chemistry**

Sorry for asking such simple question. Why we must assume like that? And why not the Kp= [HI]^2/[H2][I2]?Yet you put 2 in front of HI. Typo?
*February 1, 2013*

**Chemistry**

Its helps a lot...btw are you assuming Kp=Kc?
*February 1, 2013*

**Chemistry**

i don't understand bobpursley..how is it actually?
*February 1, 2013*

**Chemistry**

At 400°C the reaction H2+I2<->2HI has an equilibrium constant Kp value of 55.5. A mixture of 1 mole of H2 and 1 mole of I2 is placed in a flask and heated to 400°C. Calculate the mole fraction of HI in the mixture of gases when equilibrium reached.
*February 1, 2013*

**English**

Last one. The story ended very happily. Adverbs very and happily or only Very?
*January 28, 2013*

**English**

How about this one? The summer rain fell extremely heavily. Are extremely and heavily both adverbs that describe fell?
*January 28, 2013*

**English**

What are the adverb(s) in the following sentence The teacher seemed unusually cheerful. Is it unusually and cheerful?
*January 28, 2013*

**physical science**

If you dissolve 25.0g og sugar in 150cubic cm of water, what is the concentration in g/cm3 g/10cm3 g/10cm3
*January 19, 2013*

**Trig**

A 12-foot ladder reaches 9 ft 6 in up a wall. How far up would a 20-foot ladder reach when placed at the same angle? Write the answer in feet with inches.
*January 17, 2013*

**math**

60%
*January 15, 2013*

**chemistry**

which is more endothermic in water, ammonium chloride or potassium nitrate
*January 13, 2013*

**Math**

If a road passes through R(4,-11) and S (0, -9) and another road passes through J (6,-2) and K(4, -5) and are straight lines, are the two roads perpendicular and why?
*January 10, 2013*

**math**

(parent). My son's problem says "the product of a number and 17"...supposed to write as expression... I'm thinking it would be a 17x=y but he's adamant that because the word "and" is in the sentence that he needs to add something as well.... (no...
*January 8, 2013*

**math**

use the properties of logarthms to find the exact value of the each expression lower 7loglower 76
*January 7, 2013*

**statistics**

At a large dept. store, the avg. number of years of employment for a cashier is 5.7 with a standard deviation of 1.8 years. If the number of years of employment at this department store is normally distributed, what is the probability that a cashier selected at random has ...
*January 4, 2013*

**statistics**

A food snack manu. samples 15 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 10.0 and the sample standard deviation is .15, find the 95% confidence interval estimate for the true mean.
*January 3, 2013*

**science**

A normal man and a heterozygous color blind "carrier" woman have a baby. If they have a girl, what is the probability that the girl will be colorblind. If they have a boy, what is the probability that the boy will be colorblind?
*December 18, 2012*

**psychology**

Marla is talking to a friend and spreading a rumor that she heard about a co-worker. When the friend asks where she heard the rumor, Marla cannot remember. Marla is experiencing what psychologists call 1)retrograde amnesia. 2)anterograde amnesia. 3)source amnesia. 4)stress ...
*December 9, 2012*

**psychology**

Recent neuroimaging research indicates that people with OCD show increased levels of grey matter in the _____ and the _____ relative to those who do not have OCD. 1)splenium; corpus collosum 2)locus ceruleus; hypothalamus 3)thalamus; left frontal cortex 4)thalamus; right ...
*December 9, 2012*

**Physics**

a mouse pushes a piece of cheese with a mass of 6.4 g for a distance of 75 cm over the frictionless surface of an air hockey table. He exerts a constant 0.5 N force as he does so. If the cheese starts from rest, what is it's final velocity?
*December 5, 2012*

**Physics**

three bugs that are connected by a mass less spider silk are pulled along a frictionless table top. The first bug has a mass of 1.5 g, the second, 2.0 g, and the third, .75 g. The spider pulling them exerts a force of 0.011 N. What is the acceleration of each bug?
*December 5, 2012*

**chemistry**

need to convert 5.26g/cm3 to m3
*December 2, 2012*

**science**

Mendel realized that the principles of probability could be used to _______ the results of genetic crosses. What's the blank? please help! thanks a bunch!
*November 27, 2012*

**physics**

A 1500kg car is approaching the hill shown in the figure at 15.0 m/s when it suddenly runs out of gas. Part A What is the car's speed after coasting down the other side?
*November 26, 2012*

**physics**

a 1100 kg wrecking ball hangs from a16m long cable. the ball is pulled back until the cable makes an angle of 17 with the vertical. By how much has the gravitational potential energy of the ball changed?
*November 26, 2012*

**hum 101**

What are some examples of a situation that the strateigies used in "The Art of The War by Sun Tzu be applied to?
*November 23, 2012*

**Chemistry**

Iron (III) hydroxide is soluble in acid: Fe(OH)3(s)3H^+(aq)-->Fe^3^+(aq)+3H2O(l) a. How many milliliters of 1.00 M HCl are needed to dissolve 1.00 g of iron (III) hydroxide? b. If you added enough HCl to dissolve the 1.00 g of iron (III) hydroxide and then diluted the ...
*November 11, 2012*

**Physics**

A 11.0-g bullet is fired horizontally into a 101-g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 160 N/m. The bullet becomes embedded in the block. If the bullet-block system compresses the spring ...
*November 11, 2012*

**chemistry**

_A2(SO3)3+_NaOH->_Na2SO3+_Al(OH)3 if you start with 389.4 g of Al2(SO3)3 and you produce 212.4 g of Na2SO3, what is your percent yield for this reaction?
*November 10, 2012*

**chemistry**

_H3PO4+_KOH->_K3PO4+_H2O if 49.0 g of H3PO4 is reacted with excess KOH, determind the percent yield of K3PO4 if you produce 49.0 g of K3PO4.
*November 10, 2012*

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