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December 20, 2014

Posts by katie


Total # Posts: 1,716

Algebra 1
You are making up your own mix of concrete to patch a set of stairs. In order to have the proper mix, you need to mix 1 part of Portland cement with 2 parts of sand and 3 parts of gravel. A. How many total parts are in one batch of concrete? B. You make a mix with 4 parts of ...
October 5, 2013

Algebra 1
23=2x+(x+3)+x I know the answer is 5 but I don't know how to show the work.
October 1, 2013

Algebra 1
what is the value of x in the rectangle Perimeter=24 meters the side is (x+3) The bottom is 2x
October 1, 2013

Math
ben deposits $320 in an account that earns 3.5% simple interest per year. what is the balance in the account year?
September 19, 2013

Math- Help Please
Find a polynominal of degree 4 that has integer coefficients and zeros 4,-4,5 and 1/2.
September 16, 2013

Math
V(t)=175(1-(t/45))^2 Find the inverse V^-1=?
September 12, 2013

language arts
why is rikki tikki tavi not afraid to fight a cobra snake
September 11, 2013

Chemistry
325
September 11, 2013

physics
You are arguing over a cell phone while trailing an unmarked police car by 25.0 m; both your car and the police car are traveling at 120 km/h. Your argument diverts your attention from the police car for 2.0 s (long enough for you to look at the phone and yell,“I won'...
September 5, 2013

physics
if a ball is tossed from ground level upward at a speed of 44 m/s how long will it take to reach its maximum height
September 4, 2013

physics
An automobile tire has a radius of 0.335 m, and its center moves forward with a linear speed of v = 24.1 m/s. (a) Determine the angular speed of the wheel. (b) Relative to the axle, what is the tangential speed of a point located 0.243 m from the axle?
July 16, 2013

Physics
An electrostatic paint sprayer has a 0.200-m-diameter metal sphere at a potential of 25.0 kV that repels paint droplets onto a grounded object. What charge must a 0.100-mg drop of paint have to arrive at the object with a speed of 10.0 m/s?
July 14, 2013

statistics
A new medication has been created to treat osteo-arthritis inflammation and pain. Doctors prescribing the drug claim that the drug is not as effective for women as men since women taking the medication have higher pain levels than men. The pharmaceutical company conducts a ...
July 8, 2013

statistics
A new medication has been created to treat osteo-arthritis inflammation and pain. Doctors prescribing the drug claim that the drug is not as effective for women as men since women taking the medication have higher pain levels than men. The pharmaceutical company conducts a ...
July 8, 2013

statistics
1. Are there more broken bones in summer or winter? We get records about the number of fractures treated in January and July at a random sample of 25 emergency rooms. The 95% confidence interval for the mean change ( μd = μJan - μJuly )in the numbers of ...
July 4, 2013

statistics
The makers of the MAGNETIZER Engine Energizer System (EES) claim that it improves gas mileage and reduces emissions in automobiles by using magnetic free energy to increase the amount of oxygen in the fuel for greater combustion efficiency. Following are test results, ...
July 4, 2013

statistics
Which of the following criteria must be met to do a one-sample test for a proportion? A. The data values in the sample must be independent. B. The parent population must be normally distributed. C. The data must come from a random sample. D. The sample size must be more than ...
June 27, 2013

Statistics
Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adult women by IBR Polls found that 65.9...
June 27, 2013

Statistics
Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adults by IBR Polls found that 65.9% of ...
June 27, 2013

Chemistry
Can someone please explain this to me?! Please! Thank you! How much (in kilograms) ethylene glycol antifreeze (C2H6O2)(molar mass 62.02 g/mol) has to be added to 14.4 kg of water to get a mixture that freezes at -15.5 degrees C. For water Kf = 1.86 degrees C kg/mol
June 21, 2013

Statistics
There is a random selection of 150 students. What is the probablity that the sample percentage of correct identification is greater than 75%?
June 18, 2013

English
what does it mean to follow in someones footsteps exceedingly?
May 31, 2013

Math
Gerald can complete a math assignment in 2 hours and a physics assignment in 1 hour. If he has 8 hours to complete a set of assignments, how many math assignments can he complete if he decides to leave the science assignments for the next day? This situation is given by 2x + y...
May 27, 2013

Statistics
Using advertised prices for used Ford Escorts a linear model for the relationship between a car's age and its price is found. The correlation coefficient is - 0.933 Determine R2 and interpret this statistic. A) R2 = 93.3% which means that 93.3% of the variation in car ...
May 26, 2013

Statistics
Using advertised prices for used Ford Escorts a linear model for the relationship between a car's age and its price is found. The correlation coefficient is - 0.933 Determine R2 and interpret this statistic. A) R2 = 93.3% which means that 93.3% of the variation in car ...
May 25, 2013

Statistics
The relationship between the number of games won during one season by a minor league baseball team and the average attendance at their home games is analyzed. A regression analysis to predict the average attendance from the number of games won gives the model y-hat = -2600 + ...
May 25, 2013

Chemistry
What is the intermolecular force for BaCO3?
May 22, 2013

social studies
I don't know the answer, I'm asking for help.
May 15, 2013

social studies
which of the following contributed to Britain's industrial revolution? A. large labor force C. powerful monarchy B. decreasing food D. decreasing money
May 15, 2013

Math
I am having trouble on this question. a cable TV company charges $24.95 per month for basic service and $6.95 per month for each premium channel. a customer's bill for one month is $45.80. write and solve an equation to find the number of premium chnnels the customer ...
May 9, 2013

MATH
If your starting salary increases 5% per year for 10 years, how does your salary at the end of the 10 years compare with your starting salary? It is nearly 63% higher It is 150% higher It is 50% lower It is 50% higher
May 9, 2013

history
write a brief description of the civil war activities in southern california from 1861-1865.
May 6, 2013

Chemistry
Why is this reaction considered exothermic? "Concentrated sulfuric acid dissolves in water and the solution becomes warmer." This is a homework question and when I answered the problem, I thought it was endothermic because the solution is gaining heat, but when my ...
May 5, 2013

Math
How long would it take to double your money at 15.86 percent with interest compounded annually?
May 5, 2013

Chemistry
cr(s)--->Cr^3(aq)+3e- and Pb2+(aq)+2e---->Pb(s) write a balanced equation Please help thanks
May 5, 2013

Chemistry
How do you find the equilibrium constant? ..steps?
May 5, 2013

Chemistry II
Calculate the pH at the equivalence point in the titration of 50ml of 0.20 M methylamine (Kb=4.3*10^-4) with a 0.40 M HCL solution.
May 3, 2013

Calculus
function f(x)=x3x2−1 defined on the interval [−16,16] A. Find the vertical asymptotes of function f(x) B. Find where it is concave up C. Find the inflection points
May 2, 2013

Calculus
function f(x)=x3x2−1 defined on the interval [−16,16] A. Find the vertical asymptotes of function f(x) B. Find where it is concave up C. Find the inflection points
May 2, 2013

math
if a woman has a 50 ft. piece of wire & cuts it into strips 1 2/3 feet long, how many pieces will she have
May 1, 2013

chemistry, stoichiometry
Consider the Balanced Chemical Equation 2N2+6H20-->4NH3+3O2 How many moles would be needed to react fully with 0.225 moles of N2?
April 30, 2013

calculus
Using 4x^2 - 9y^2 = 36 Find y by implicit differentiation and then solve the equation explicitly for y and differentiate to get y' in terms of x.
April 29, 2013

Calculus
Using 4x^2 - 9y^2 = 36 Find y by implicit differentiation and then solve the equation explicitly for y and differentiate to get y' in terms of x.
April 29, 2013

chemistry
a 2.3% (m/v) LiCI solution p;repared from 53.0 ml of a 10.0%(m/v)LiCI solution. what is volume in milliliters
April 27, 2013

South Tahoe Middle School
A loan of $20,000 at 8% with payments & interest of $1,800. What is the amount owed after 11 payments have been made?
April 26, 2013

Help???
Anyone know?
April 22, 2013

Probability?
A bag contains 7 green marbles, 9 red marbles, 10 orange marbles, 5 brown marbles, and 10 blue marbles. You choose a marble, replace it, and choose again. Find P(red, then blue).
April 22, 2013

Calculus
Find the area of the region. f(x) = x^3 g(x) = x^4 In the graph f is above g and they both intersect at (1,1)
April 21, 2013

Maths
Given that on average, an atom of gold weighs 3.27×10^−22grams, how much does an Avagadro’s number of gold atoms weigh (take Avagadro’s number to be 6.0221415×10^23).
April 21, 2013

Intrest?
1. Find the total amout if you deposit $600 at a rate of 5% for 2 years compounded anually. 2. Find the total amout if you deposit $800 at a rate of 8% for 4 years compounded anually.
April 19, 2013

Algebra 1
Rena has to pay the first $100 of her medical expenses each year before she qualifies for her insurance company to begin paying. After paying the $100 "deductible," her insurance company will pay 80% of her medical expenses. This year, her total medical expenses came...
April 19, 2013

Uof Phoenix
You divide 6x by 6. You will get one. Then you divide 12 by 6.
April 19, 2013

chemistry
wat chemical reactions are considered to be of importance to healthcare professionals? describe rational.
April 18, 2013

Calculus
Sketch the graph and find the area of the region described below. f(x)= -3xe^((-x)^2) Find the area of the region bounded below by the graph of f(x) and above by the x-axis from x = 0 to x = 3.
April 18, 2013

Calculus
Find the area of the shaded region. The area is shaded from 0,2 on the x-axis Given: y=0 and y= x^4-2x^3
April 18, 2013

Calculus
find the area of the region described below. f(x)= -e^((1/2)x) Find the area of the region bounded below by the graph of f(x) and above by the x-axis from x = -4 to x = 4.
April 17, 2013

Calculus
find the area of the region described below. f(x)=-4-sq rt of x Find the area of the region bounded below by the graph of f(x) and above by the x-axis from x = 0 to x = 4. Thank you!
April 17, 2013

Help meee
Answer from spreadsheet Answer from hand calculation Problem #1: Find the total amount if you deposit $500 at a rate of 5% for two years using simple interest. Year 1 Year 2 Problem #2: Find the total amount if you deposit $300 at a rate of 6% for three years using simple ...
April 17, 2013

physic
a 1.6kg block of wood is floating in water. what is the magnitude of the buoyant force the block?
April 16, 2013

Math
Create two different situations: one in which you use combinations and one in which you use permutations. Include specific details and an explanation about what makes each situation either a combination or permutation.
April 16, 2013

physics
a stone of mass 1 kg is tied to the end of a string 1m long . it is whirled in a vertical circle . if the velocity of the stone at the top be 4m/s , what is the tension in the string ?
April 13, 2013

Calculus
The velocity of an object t seconds after it started moving is t(t-6). Find the total change in the object's position in the 6th second.
April 12, 2013

Calculus
The velocity of an object t seconds after it started moving is 6). Find the total change in the object's position in the 6th second.
April 11, 2013

math
4xsquared+ 4x -3 =0 SOLVE
April 9, 2013

math
Anyone know what 1/2 is in simplest form??
April 9, 2013

math
What is 2:1 and 1:2 in simplest form?
April 9, 2013

math
Simplify the expression if possible. log(100^4z)
April 7, 2013

math
Let 2^a = 5 and 2^b = 3. Using exponent rules, solve the equation in terms of a and b. 0.4^x = 27
April 6, 2013

chemistry
What is the concentration when 60.0 mL of a 9.00 M HCl solution is diluted to 1.170 liters? and how do you solve this problem?
April 4, 2013

Help? Math
Use equal intervals to make a frequency table for the average number of movies per person. You do not need to show tally marks. Country Average Number of Movies Turkey 0.5 Japan 1.2 UK 1.3 Finland 1.3 Austria 1.5 Germany 1.8 Spain 2.2 Sweden 2.2 Denmark 2.2 Switzerland 2.5 ...
April 4, 2013

Math Ms. Sue! Steve! Any ideas?
Help?
April 4, 2013

Math
Use equal intervals to make a frequency table for the average number of movies per person. You do not need to show tally marks. Country Average Number of Movies Turkey 0.5 Japan 1.2 UK 1.3 Finland 1.3 Austria 1.5 Germany 1.8 Spain 2.2 Sweden 2.2 Denmark 2.2 Switzerland 2.5 ...
April 4, 2013

chemistry
If a sample of HNO3 is found to contain 8.44 · 10-2 mol of N atoms how many moles of HNO3 molecules are present? Express your answer in scientific notation.
April 3, 2013

Ms. Sue or Steve Help
What school do you go to?
April 3, 2013

English
I'm writing a comparison paper on artworks and I'm just thinking either to write about two women painting (European/modern women) OR two churches Gothic/Romanesque). Which one do you think will have more visual/background information? I was thinking to write about the...
April 1, 2013

Math
190 students like the program 135 students think the program is unnecessary 220 students plan on running for student government next year. If a circle graph were made from this data, what would the measure of the central angle be for the group that likes the program? Round ...
April 1, 2013

Chemistry
I made a mistake. the initial concentration of NaOH is 1.0M.
March 30, 2013

Chemistry
Calculate the molar mass of a diprotic acid. It reaches the endpoint of the titration with NaOH at 28ml. The initial concentration of NaOH is 0.09792. and the initial mass of the diprotic acid is 0.685g. I keep getting a molar mass of 500g/mol. but the options are all around ...
March 30, 2013

Chemistry
So you need to times the molarity by two?
March 30, 2013

Chemistry
Calculate the molar mass of a diprotic acid. It reaches the endpoint of the titration with NaOH at 28ml. The initial concentration of NaOH is 0.09792. and the initial mass of the diprotic acid is 0.685g. I keep getting a molar mass of 500g/mol. but the options are all around ...
March 30, 2013

Chemistry
How many mL of 12M HCl is needed to create 350mL of 0.125M HCl?
March 28, 2013

history
lol wut?
March 25, 2013

math
For the function f(p) an input of 3 yields an output value of 6. What value of p would you use to have f(5p) = 6?
March 24, 2013

Chemistry
K1 = 0.727 K2 = 12.1 T1 = 2000 T2 = 3000 Solve for the standard enthalpy of formation. They gave me the formula ln(K2/K1) = DeltaH /R (T2 - T1 / T1T2) The answer is supposed to be in KJ/mol and I keep getting 2.022 but its not right. I'm not sure what Im doing wrong
March 24, 2013

math
For the function f(p) an input of 3 yields an output value of 6. What value of p would you use to have f(5p) = 6?
March 22, 2013

Chemistry
A 50.0 mL sample of 0.10 M pyridine, C5H5N, is titrated with 0.2 M HBr. Calculate the pH to one decimal place when the following volumes of titrant have been added. 0.00 mL a) 0ml b)17ml c)25ml d)40ml
March 7, 2013

math
6^(2log(x)) = 8
March 5, 2013

math
Let 2^a = 5 and 2^b = 10. Using exponent rules, solve the equation in terms of a and b. 10^x =(1/64)
March 3, 2013

statistics
In a certain region, the mean annual salary for plumbers is $51,000. Let x be a random variable that represents a plumber's salary. Assume the standard deviation is $1300. If a random sample of 100 plumbers is selected, what is the probability that the sample mean is ...
February 25, 2013

statistics
the breaking distance of a Honda CRV can be approximated by a normal distribution, where the mean is 53 meters and the standard deviation is 3.8 meters. Let x be a random variable that represents a braking distance. Find the probability that a randomly selected braking ...
February 25, 2013

P Value Math Statistics
Find the P-value for the indicated hypothesis test with the given standardized test statistics, z. Decide whether to reject H0 for the given level of significance a. two-tailed test with test statistic z= -1.57 and a=0.04
February 24, 2013

statistics
In a normal distribution with mu = 25 and sigma = 3, what number corresponds to z = -3? is it 16, 18, or 20
February 24, 2013

Gen Math
A school dance has 228 students. There are 63 fewer girls than twice as many boys. How many boys and girls attended the dance?
February 24, 2013

Economics
A $90,000 investment is made. Over a 5 year period, a return of $30,000 occurs at the end of the first year. Each successive year yields a return that is $3,000 less than the previous year's return. If money is worth 5 percent, use a gradient series factor to determine the...
February 23, 2013

Finance
You plan to open a retirement account. Your employer will match 50 percent of your deposits up to a limit on the match of $2500 per year. You believe the fund will earn 12 percent per year over the next 30 years, and you will make 30 deposits of $5000, plus 50 percent employer...
February 23, 2013

college algebra
driving along a crowded freeway you notice that it takes a time to go from one mile marker to the next. when you increase your speed by 8.4 mi/hr the time to go one mile decreased by 14 seconds. What was your original speed?
February 21, 2013

Chemistry
How many grams of solute are present in 875 mL of 0.180 M KBr?
February 20, 2013

Chemistry...
The oxygen gas emitted from an aquatic plant during photosynthesis is collected over water at a temperature of 25 degrees celsius and a total pressure of 762 torr. What is the partial pressure of the oxygen gas? What formula do I need to use?
February 20, 2013

Need help asap**
Oh goodness. I'm deeply sorry. I wasn't trying to make anyone angry or annoyed.
February 20, 2013

Need help asap**
The oxygen gas emitted from an aquatic plant during photosynthesis is collected over water at a temperature of 25 degrees celsius and a total pressure of 762 torr. What is the partial pressure of the oxygen gas? What formula do I need to use?
February 20, 2013

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