Tuesday

February 9, 2016
Total # Posts: 59

**Math!!!**

That's equal to zero :) :) :) For this question I got .45 and it was automatically marked as wrong so I was frustrated! Thank you!
*January 6, 2016*

**Math!!!**

Suppose Y is a continuous variable whose density gives the following probabilities: Pr{ Y < -3 } = 0.05 Pr{ -3 < Y < -1 } = 0.15 Pr{ -1 < Y < 0 } = 0.3 Pr{ 0 < Y < 1 } = 0.3 Pr{ 1 < Y < 3 } = 0.15 Pr{ Y > 3 } = 0.05 Compute Pr{ Y > 0 } = ???? ...
*January 6, 2016*

**Math**

The base of a triangle is three inches more than its height. If each is increased by 3 inches the area of the triangle (1/2 bh) is 14 square inches. Find the original base (𝑏) and the original height (ℎ) in inches. (Lesson 15)
*December 15, 2015*

**Math**

A pharmacist is to prepare 30 milliliters of a solution with a drug concentration of 2 mg/mL. To do so, he will mix a solution with a drug concentration of 7 mg/mL with grape-flavored syrup. If 𝑥 represents the number of milliliters of grape-flavored syrup needed, find...
*December 15, 2015*

**Math**

solve the exponential function for x using base 5 logarithms. 5^x+4=125^1-3x
*December 13, 2015*

**Math**

solve the exponential function for x by using common logarithms. 5^x=50^x+1
*December 11, 2015*

**Math**

Find all values of 𝑐, so that the solutions of the following equation are real numbers 2x2 − 4𝑥 + 𝑐 = 0
*December 11, 2015*

**Math**

You have 8 liters of a 60% alcohol solution. How many liters of water should be added to make a 35% alcohol solution?.
*December 11, 2015*

**Math**

A woman rows a boat 1.75 miles upstream against a constant current in 35 minutes. She then rows the same distance downstream (with the same current) in 15 minutes. What is the rate of the current?
*December 11, 2015*

**Math**

The base of a triangle is three inches more than its height. If each is increased by 3 inches the area of the triangle (1/2 bh) is 14 square inches. Find the original base (𝑏) and the original height (ℎ) in inches. (Lesson 15)
*December 11, 2015*

**Math**

Temperature readings on the Fahrenheit and Celsius scales are related by the formula 𝐶 = 5 9 (𝐹 − 32). Determine when the temperature reading on the Celsius scale is twice the temperature reading on the Fahrenheit scale.
*December 10, 2015*

**Math**

The length of a rectangular pool is to be four times its width, and a sidewalk 6 feet wide will surround the pool. If a total area of 1440 𝑓𝑡 2 has been set aside for construction, what are the dimensions of the pool?
*December 10, 2015*

**math**

Two trains leave a station at 11:00am. One train travels north at a rate of 75 mph and another travels east at a rate of 60 mph. Assuming the trains do not stop, about how many minutes will it take for the trains to be 250 miles apart?
*December 10, 2015*

**Differentials (calc)**

Solve the Poisson equation ∇^2u = sin(πx) for 0 ≤ x ≤ 1and 0 ≤ y ≤ 1 with boundary conditions u(x, 0) = x for 0 ≤ x ≤ 1/2, u(x, 0) = 1 − x for 1/2 ≤ x ≤ 1 and 0 everywhere else. Hint: break this up as into two ...
*December 7, 2015*

**Math**

A high-speed train makes a 360 mile nonstop run between two major cities in 712 hours. The train travels 80 mph in the country, but safety regulations require that it travel only 20 mph when passing through smaller, intermediate cities. How many hours are spent traveling ...
*December 7, 2015*

**Math**

British sterling silver is a copper-silver alloy that is 7.5% copper by weight. How many grams of pure copper and how many grams of British sterling silver should be used to prepare 200 grams of a copper-silver alloy that is 10% copper by weight? (round to the nearest tenth)
*December 7, 2015*

**Math**

After a boulder is pushed down a hill, its speed s(t) at time t is given by the formula s(t)=v+at, where v is the initial velocity and a is the acceleration. If s(2)=16 and s(5)=25, find the initial velocity and acceleration.(round to the nearest tenth)
*December 7, 2015*

**Math**

For a particular quadratic function f(x)=ax^2+bx+c, f(−3)=−13 and f(2)=7. If a=−3, find b and c.
*December 7, 2015*

**Math**

With the current, a person can canoe 24 miles in 4 hours. Against the same current, the same person can canoe 18 miles in 6 hours. Find the person’s average rate in still water and the average rate of the current.
*December 7, 2015*

**Math**

Thank you
*December 7, 2015*

**Math**

A short airplane trip between two cities took 30 minutes when traveling with the wind. The return trip took 45 minutes when traveling against the wind. If the speed of the plane with no wind is 320 mph, find the speed of the wind and the distance between the two cities (hint: ...
*December 7, 2015*

**L.A homework help!!**

How does this sound? I think she sees the theme of her aunt's story that being good isn't always going to save you from problems. Like when she says "Wouldn't they have saved her even if she wasn't good?" meaning, being good not always comes in handy...
*September 11, 2015*

**L.A homework help!!**

well the theme is too not be a good-goody idk i have trouble with theme
*September 11, 2015*

**L.A homework help!!**

I don't understand how i should explain it or how they want me to explain it.
*September 11, 2015*

**L.A homework help!!**

Its about a mom that has two girls and one boy. She tells them a story about a girl that is good and in the end people save her from a bull. But then the bachelor, thinks that the story is boring, so he tells a different story that will capture the kids attention about a girl ...
*September 11, 2015*

**L.A homework help!!**

At the end of her aunt's story in “The Story-Teller," the older girl asks whether the girl in the story would have been rescued even if she had not been good. what does she seem to think is the theme of her aunts story? What detail in the aunt's story leads ...
*September 11, 2015*

**Algebra**

Given the function rule f(x)=x^2-4x+3, what is the output of f(-3)? A- 24 B- 21 C- 0*** D- -3
*May 28, 2015*

**Physics Help Please**

A solenoid 20 cm long is constructed from 500 loops of wire and carries a current of 5 A as seen the diagram below. A tiny hole is drilled through the diameter of the solenoid in such a way that the current through the solenoid is not disrupted. If an electron flies through ...
*April 1, 2015*

**Physics**

A dragster's top acceleration is 60m/s^2. If it accelerates for 3 seconds from the starting line, how fast will it be going?
*March 24, 2015*

**4th grade math**

1.50(253) - 78(253) It should be $182.16
*March 24, 2015*

**Physics**

A Green light wave is traveling a rate of 3*10^8 m/s and a wavelength of 561 m. How fast would a red wave with a wavelength of 447m travel?
*March 20, 2014*

**Statistics**

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study, 449 babies were born, and 250 of them were girls. Use the sample data with .01 significance level to test the claim that with this method, the probability of a baby being a...
*November 26, 2013*

**Biology**

What would happen if you ran the same sample of DNA as your first experiment but used different primers?
*October 28, 2013*

**Algebra**

The simple formula for the nth term of an arithmetic sequence is an = 4n + 16. What is the explicit formula corresponding to the simple formula?
*April 4, 2013*

**Algebra**

Which of the following methods can be used to construct a pattern of 10 numbers for which it would be mathematically impossible to predict the 11th term? (more then one answer.) A.Make a pattern, starting with 3, where each number is the next digit of pi (3.14159 . . .). B....
*April 4, 2013*

**physics**

State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS Is a -6.75DS?....
*October 23, 2012*

**GEOMETRY**

The diameter of a circle has endpoints P(–10, –2) and Q(4, 6). a.Find the center of the circle. b.Find the radius. If your answer is not an integer, express it in radical form. c.Write an equation for the circle.
*May 30, 2012*

**chemestry**

the mass of CuSCN precipitate is 1.379g, what is the mass of copper in the precipitate?
*September 29, 2011*

**chemestry**

a coin is composed of gold and silver. the 5.00g coin is dissolved in nitric acid and the solution treated with NaCl to precipitate out 2.35g of AgCl. Gold chlorides do not precipitate under the same conditions. What is the composition of silver (by mass) in this coin?
*September 29, 2011*

**IPC**

its an online coarse.. thanks.
*May 11, 2011*

**IPC**

Dont understand ipc at all... As more resistors are added to a series circuit, the current ____ Increases Stays the same Decreases
*May 11, 2011*

**College Chemistry**

The molar heat of reaction, H rxn, for the reaction of Ca(s) + 2H+(aq) Ca2+(aq) + H2(g) is -544.789 kJ/mol and Hrxn, for the reaction of CaO(s) + 2H+(aq) Ca2+(aq) + H2O(l) is -192.42 kJ/mol, the heat of formation of water is -286 kJ/mol, The H ffor CaO(s) is _____ kJ/mol. ...
*February 18, 2011*

**tats**

No(Did not lie) Yes(lied) positive test result 15(false positive) 42(true positive) negative test result 32(true negative) 9 (false negative) Refer to table and assume that one of the 98 test subjects is randomly selected. Find the probability of selecting a subject with a ...
*February 6, 2011*

**stats**

group rh+ 39 35 8 4 rh- 6 5 2 1 People with blood type AB and rh+ are considered to be universal recipients. If three of the 100 subjects are selected find the probability they are all universal recipients.
*February 6, 2011*

**Stats**

Among 15,378 Delta airline passengers randomly selected, 3 were bumped from a flight against there wishes (based on data from the us dept of transportation) find the probability that a random selected passenger is involuntarily bumped. Is such bumping unusual? Does such ...
*February 1, 2011*

**physics**

A yo-yo has a rotational inertia of 810 g·cm2 and a mass of 95 g. Its axle radius is 2.6 mm and its string is 100 cm long. The yo-yo is thrown so that its its initial speed down the string is 1.0 m/s. (a) How long does the yo-yo take to reach the end of the string? s (b...
*January 23, 2011*

**Math**

What is the difference between the height of the tallest man at 92.95" and the mean height of men at 69.6" and a stanard deviation of 2.8? How many standard deviations is that? Convert tallest man to a z score Does tall mans height meet the criterion of being unusual...
*January 23, 2011*

**statistics**

What is the difference between the height of the tallest man at 92.95" and the mean height of me at 69.6" and a stanard deviation of 2.8? How many standard deviations is that? Convert tallest man to a z score Does tall mans height meet the criterion of being unusual ...
*January 23, 2011*

**physics**

A loudspeaker diaphragm is vibrating in simple harmonic motion with a frequency of 430 Hz and a maximum displacement of 0.90 mm. what is the max speed? what is the max acceleration?
*January 22, 2011*

**math please help!**

miguel line sup 5 cups of pop (labelled Cup 1, 2, 3, 4, 5 on a table. sandra then tastes each cup and records "D" if she thinks its diet pop or "R" if she thinks its regular pop. a. how many different ways can the Ds and Rs be recorded if sandra guesses ...
*January 18, 2011*

**Chemistry**

how would you find total number of moles?
*October 16, 2010*

**chemistry**

Sulfuric acid reacts with hydrogen iodide to produce sulfur dioxide, iodine and water. a) write total ionic equation b)write net ionic equation
*April 23, 2010*

**chemistry**

A 31.5 ml aliquot of H2SO4 of an unknown concentration was titration with 0.0134 M NaOH. write the balanced chemical reaction with the correct states of matter.
*April 23, 2010*

**CALCULUS 2**

Consider the solid obtained by rotating the region bounded by the given curves about the line x = 1. y = x, y = 0, x = 4, x = 6 Find the volume V of this solid
*February 17, 2010*

**CALCULUS 2**

It's calculus and it's in my homework.
*February 17, 2010*

**CALCULUS 2**

Consider the solid S described below. A right circular cone with height 7h and base radius 2r Find the volume V of this solid
*February 17, 2010*

**Mrs R**

Probably the beggining and why it started
*October 29, 2007*

**World History**

what are the most important events that happened in the genocide in rwanda?
*October 29, 2007*

**FIN**

Brady Corporation is a leader in identification, safety, and material solutions. In 1998, the firm was hit hard by faltering foreign markets, so it embarked upon an aggressive campaign to redesign its cost structure. The firm believes this will help it to enhance future ...
*August 7, 2007*

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