# Posts by katie

Total # Posts: 2,091

**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**

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*

**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*

**report**

thank you

*February 19, 2013*

**report**

What are key findings? I have to include this in a lab report. Thank you for any help

*February 19, 2013*

**Physics**

A plant falls from the windowsill of an apartment in a very tall building. If the floor of your apartment is 12.19 m above the ground, and it takes the plant 0.2580 seconds to cross your 9 ft window, from what height did the plant fall? ? m Explain what would be different if ...

*February 19, 2013*

**math**

14=2/3(9y-15)

*February 18, 2013*

**science**

How do I make an acrostic that has to do with the word Wavelength?

*February 17, 2013*

**Statistics**

These are the only ones that I am having problems with. Please help.. 8.You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and the 95% confidence intervals for the population mean. Interpret the results and compare the ...

*February 17, 2013*

**Chemistry**

On a 10.5 ounce bag of potato chips, the manufacturer states that the single serving is one ounce, which is equivalent to 150 calories. How many kilojoules are in this bag of potato chips? Is it 6.5898kJ?

*February 9, 2013*

**Chemistry**

Ooops, sorry Linda.

*February 9, 2013*

**Chemistry**

On a 10.5 ounce bag of potato chips, the manufacturer states that the single serving is one ounce, which is equivalent to 150 calories. How many kilojoules are in this bag of potato chips? Is it 6.898 kJ?

*February 9, 2013*

**science**

Newton’s Second Law of Motion is expressed as F = ma. If you are pushing a lawn mower in your backyard and suddenly double the pushing force, what will happen to the lawn mower's rate of acceleration? The mass of the lawn mower is constant. A. The acceleration will ...

*February 8, 2013*

**math**

Jill is correct because angels is on any shape

*February 5, 2013*

**math**

thanks

*February 5, 2013*

**math**

I got (9,28) is that right.

*February 5, 2013*

**math**

solve using substitution y=4x-8 y=2x+10

*February 5, 2013*

**Physics**

According to Anna, on Earth, Bob is on a spaceship moving at 0.8c towards Earth, and Carl, a little farther out, is on a spaceship moving a 0.9c towards Earth. According to Bob, how fast is Carl moving relative to Earth? (a) According to Bob, how fast and in what direction is ...

*February 4, 2013*

**social studies**

Which of the following types of information are people LEAST comfortable revealing to professionals? a. emotional b. financial c. legal d. medical

*February 4, 2013*

**Chemistry 3A**

You want to make the following buffer: 5% glucose, 100 mM tris and 10 mM EDTA in a final voume of 300ml. Your stock solutions are 20% glucose, 1M tris and 0.5M EDTA. The diluent is distilled water. Determine how much of each you will add to make the desired buffer. I know this...

*February 1, 2013*

**Math**

Calculate how long a de-orbit burn must last in minutes and seconds to achieve the Shuttle’s change in altitude from 205 miles to 60 miles at perigee.Use the equations and conversions provided below in method 1 or method 2 to find the required burn time

*February 1, 2013*

**penn foster**

im trying to finish these classes soon so i can start college, but honestly they are too complex. and i NEED HELP!!!! I have 1-5 done. 6. In the Mongol Empire, the plague A. provided new oppurtunities for territorial expansion B.ended further expansion C. had no effect, ...

*January 30, 2013*

**physics**

Bob and Bob Jr. stand at open doorways at opposite ends of an airplane hangar 25 m long. Anna owns a spaceship, 40 m long as it sits on the runway. Anna takes off in her spaceship, then swoops through the hangar at constant velocity. At precisely time zero on both Bob's ...

*January 30, 2013*

**Physics**

Bob and Bob Jr. stand at open doorways at opposite ends of an airplane hangar 25 m long. Anna owns a spaceship, 40 m long as it sits on the runway. Anna takes off in her spaceship, then swoops through the hangar at constant velocity. At precisely time zero on both Bob's ...

*January 29, 2013*

**Algebra**

Find three consecutive integers such that the product of the two largest is 29 more than the square of the smallest integer. (Enter your answers as a comma-separated list.)

*January 29, 2013*

**chemistry**

Which of the following compounds is expected to have the weakest interactions between its molecules? CO2 Strongest interaction? SO2

*January 28, 2013*

**CHM**

The correct answer is "atoms of gold turning into atoms of iron"

*January 27, 2013*

**College Algebra**

V= 4/322/7r^ 3 v= 4/3 *22/7*(6 1/4 in)^3 v=3/4 * 22/7 * 15625/64 v= 1023.065476 how to change to a mix-number?

*January 27, 2013*

**College Algebra**

I like to change this(1023.065476) whole number into a mix-number to find the volume of the sphere (6 1/4 in) using 22/7 for pie.

*January 27, 2013*

**geometry**

if measure of angle SUT=3x+6 and measure of angle RUS=5x-4, find measure of angle SUT

*January 27, 2013*

**science**

Lipids: Not a polymer because _ __x's energy than carbs Saturated= Unsaturated= Nucleic Acids: RNA= DNA= Carbohydrates: Building blockks

*January 26, 2013*

**science**

I think it's about 20.

*January 26, 2013*

**science**

How many amino acids are there in protien

*January 26, 2013*

**Math**

I am a 4digits number with 6 hundreds and 5ones.The sum of all my digits is 15 .What number am I

*January 25, 2013*

**Math 7A**

Use the function rule, y = 2x + 5, to find the values of y when x = 1, 2, 3, and 4. Write the answers as ordered pairs that would be used to graph the function. can someone help me i'm stuck on this question

*January 21, 2013*

**alg/trig**

The first thing you want to do is get rid of x in the denominator, because that simplifies things quite a bit. Think of the easiest common denominator between 9/x and 9/(x-2), which would be x(x-2). You know that x-2/x-2 = 1, regardless of the value of x; the same with x/x, so...

*January 21, 2013*

**Math**

10^5.4 = 251188.6432 = 2.5 X 10^5 You can just plug this in the calculator. I think it's two significant figures

*January 21, 2013*

**Physics**

t(Earth) = t(satellite) / (square root) 1 - (v/c)^2 = t(satellite) / (square root) 1 - [ (3.9 x 10^3) / (3x 10^8)^2 ] = (1 - 1.7 x 10^-10)^ - 1/2 [ t(satellite) ] t(Earth) = (1 + 8.5 x 10^-11) [ t(satellite) ] GMEarth = (6.67 x 10^-11 N x m^2/kg^2) (5.98 x 10^24 kg) = 4.0 x 10...

*January 21, 2013*

**Physics**

A GPS satellite orbits at an altitude of 2.0 x 10^7 m and a speed of 3.9 x 10^3 m/s, Earth’s radius is 6.4 x 10^6 m, and a point at its equator has tangential speed of 460 m/s, By approximately what fraction must the time be adjusted to account for both regular/speed-...

*January 21, 2013*

**Math**

7 snow days divide by the the amount of days in december which is 31 days (7/31) x 100 = 22.5 %

*January 21, 2013*

**math**

How would I write 2 inequalities that describe in basketball that 2 points = field goal and 1 point = free throw and I have scored at least 3 points in every game this season and 15 points for the most points in one game? Please Explain! I don't understand.

*January 21, 2013*

**Math**

Use the function rule, y = 2x + 5, to find the values of y when x = 1, 2, 3, and 4. Write the answers as ordered pairs that would be used to graph the function.

*January 18, 2013*

**Physics**

thank you

*January 18, 2013*

**Physics**

The kinetic energy of a proton is half its internal energy. What is the proton's speed? Kinetic energy is (Yu - 1) (mp) (c)^2 = 1/2 (mp) (c)^2 Yu = 1.5 Yu = 1/(square root) 1 - (u/c)^2 1/(square root) 1 - (u/c)^2 = 1.5 u= 0.745c How do I solve for u? I'm extremely ...

*January 18, 2013*

**trig proofs**

cotx+tanx=secx+cscx

*January 15, 2013*

**Math**

Number Sense How can you use 4 x 7 to find 8 x 7? Find the product.

*January 8, 2013*

**Calculus II**

ok thank you very much. Happy New Year

*December 30, 2012*