Friday

January 20, 2017
Total # Posts: 91

**PRECALC**

A drug is administered every 6 hours. The kidneys eliminate 55% of the drug over that period. The initial dose is 210 mg. Repeated dosage is 70 mg What is the “Difference equation”? Find the first seven terms of the of the solution sequence. Round to two digits each ...

*May 18, 2016*

**math**

Farmer Brown planted corn and wheat on his 450 acres of land. The cost of planting and harvesting corn is $280.00 per acre. The cost of planting and harvesting wheat is $125.00 per acre. If Farmer Brown's total cost was $102,750, how many acres of corn did he plant?

*May 17, 2016*

**Algebra**

Using the equation, y=-2/3x-2, find the equation of the line that is parallel and has the ordered pair (3,3). Write the answer in standard form.

*March 5, 2016*

**Fluid Mechanics**

I am trying to work a problem to find flowrate, and a time to reach equilibrium. It sets up like this: I have a tank with a volume of 400 cubic feet full of compressed air at 50psi. The tank has an 8" schedule 40 carbon steel pipe coming off of it with a valve at the tank...

*March 1, 2016*

**Math**

Great, thanks!

*February 3, 2016*

**Math**

The science club sold 24 T-shirts last week and 18 T-shirts this week. What is the percentage of decrease in the number of T-shirts sold? A: 33% B: 25% C: 50% D: 75% How do you do this?

*February 3, 2016*

**Calculus 1**

You have 4L feet of fence to make a rectangular vegetable garden alongside the wall of your house, where L is a positive constant. The wall of the house bounds one side of the vegetable garden. What is the largest possible area for the vegetable garden?

*November 1, 2015*

**Calculus 1**

A family wants to fence a rectangular play area alongside the wall of their house. The wall of their house bounds one side of the play area. If they want the play area to be exactly 1600ft^2, what is the least amount of fencing needed to make this? Round your answer to the ...

*November 1, 2015*

**chem**

A student mixes 5 mL of 2.00 x 10^-3 M Fe(NO3)3 with 5 mL 2.00 x 10 ^-3 M KSCN. They find that in the equilibrium mixture concentration of FeSCN^2+ is 1.40 x 10^-4 M. Find each of the following: the initial concentration in solution for Fe^3+ and SCN, the equilibrium constant ...

*October 14, 2015*

**Mathematics**

Solve for x: (385)^2 - x^2 = (760.35)^2 - (637.4 - x)^2

*April 29, 2015*

**Math**

A truck carries cartons packed with boxes. The boxes were 22 inches long on each edge. If 4 boxes completely fill the carton, what is the volume of carton in cubic feet?

*April 15, 2015*

**math**

is the answer A. Median Ms. Sue?

*April 9, 2015*

**math**

There are 5 numbers in a set of data. There are no repeated numbers. Which measure of data must represent a number in the set that is greater than 2 of the numbers in the set and less than 2 of the numbers? A. Median B. Mean C. Mode D. Range Can someone please explain how to ...

*April 9, 2015*

**Math**

A circle has the circumference 28.26cm. What is the area of the circle? use PI as 3.14. i am confused in how to even solve with the circumference to get the area. Please help

*January 21, 2015*

**calculus**

If sec x = -3, 0 < x < pi, find cot x.

*December 4, 2014*

**Physics, Help!! URGENT!!!**

A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg?

*October 5, 2014*

**Physics**

Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration less than 800 m/s2 lasting for any length of time will not cause injury, whereas an acceleration greater than 1000 m/s2 lasting for at least 1 ms ...

*September 2, 2014*

**Physics**

A 54.0-g Super Ball traveling at 29.0 m/s bounces off a brick wall and rebounds at 18.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 4.00 ms, what is the magnitude of the average acceleration of the ball during this time interval in ...

*September 2, 2014*

**math**

A board is 84 cm long. How many meters long is this board?

*June 10, 2014*

**Physics**

The displacement, force, velocity, and acceleration vectors’ components are given. Calculate the magnitude and direction of each vector. (a) x = +15.0 cm, y = -12.3 cm. I am completely lost.

*June 4, 2014*

**Physics**

Looking up the answers will not help you on the physics test. Try looking in your book or reading guides for additional help.

*March 12, 2014*

**Chemistry**

Chloroform CHCl is an important solvent. It is produced by a reaction between methane and chlorine. How many g CH4 are needed to produce 50.0g CH4 +Cl3+ CH_4 + 3Cl_2 ->CHCl_3 + 3HCl}

*February 10, 2014*

**Chemistry**

2 SO2 (g) + O2 (g) → 2 SO3↑ Assuming STP, how many grams of oxygen are needed to produce 19.8 liters of SO3?

*February 10, 2014*

**Physics**

damon your answer is wrong i hate you

*January 5, 2014*

**science**

What are the measurable causes of weather and how does it impact our world?

*December 29, 2013*

**chemistry**

how many grams of chromium are required to react with 125 mL of 0.75M CuSO4?

*December 16, 2013*

**Algebra, HELP IM CLUELESS**

Eureka is 16 years younger than Renton. In 3 years Renton will be twice as old as Eureka. How old are they now? Eureka's Age: Renton's Age:

*September 7, 2013*

**Integrals**

Evaluate the integral of ∫(2x^2 −3)^2 dx

*May 20, 2013*

**calculus**

For the function f(x) = 3x2 − 5x − 7. Find the rate of change of f(x) at x = 3

*May 20, 2013*

**statistics**

Idiocracy. It's not a movie.

*May 18, 2013*

**calculus**

The marginal cost for a product is given by dC/dq = 1000/sqrt3q+20, in hundreds of dollars, where q is given in thousands of units. Determine the cost in dollars involved in increasing product from 10 to 15 thousand units. If R(0)= C(0)= 0, the marginal revenue is given by dR/...

*May 14, 2013*

**Calculus**

Fuel is flowing into a storage tank which can be filled to a depth of 6 metres. When the fuel started flowing the tank was already filled to a depth of 2.5m. If the rate at which the depth of fuel in the tank is increasing, in metres per hour is given by d'(t) = 4t +5, ...

*May 14, 2013*

**Calculus**

Fuel is flowing into a storage tank which can be filled to a depth of 6 metres. When the fuel started flowing the tank was already filled to a depth of 2.5m. If the rate at which the depth of fuel in the tank is increasing, in metres per hour is given by d'(t) = 4t +5, ...

*May 13, 2013*

**Calculus**

The marginal cost for a product is given by dC/dq = 1000/sqrt3q+20, in hundreds of dollars, where q is given in thousands of units. Determine the cost in dollars involved in increasing product from 10 to 15 thousand units. If R(0)= C(0)= 0, the marginal revenue is given by dR/...

*May 13, 2013*

**Calculus**

The acceleration due to gravity near the surface of Mars is 3.72ms^-2 . A rock is thrown straight up from the surface with an initial velocity of 23ms^-2 . How high does it go?

*May 13, 2013*

**Calculus**

Given f(x)=1+2cos x , find the area under the curve y=f(x) between x = pi/2 and 2pi/3.

*May 13, 2013*

**Calculus**

A cone is inscribed in a sphere of radius a, centred at the origin. The height of the cone is x and the radius of the base of the cone is r, as shown in the diagram opposite. Find the height, x, for which the volume of the cone is a maximum. (HINT: show that the volume of the ...

*May 6, 2013*

**Calculus**

A function is implicitly defined by x^2 - 4y^2 = 9 Find the equation of the tangent to the function at x = 1

*May 6, 2013*

**Calculus**

Given the function f (x) = 3cos x for the interval 0 < x < 2 sketch the graph of the function

*May 3, 2013*

**calculus**

Given the function f (x) = 3cos x for the interval 0 < x < 2pi, determine the concavity of the function, between the critical values

*May 3, 2013*

**Calculus**

Use Newton’s method to approximate the root of x^2 + 4x + 2 = 0 between x = -4 and x = -3 .

*May 3, 2013*

**math**

A ladder 10 m long rests on horizontal ground and leans against a vertical wall. The foot of the ladder is pulled away from the wall at 2 m/s. How fast is the top sliding down the wall when the foot of the ladder is 6m from the wall?

*May 3, 2013*

**science**

how many milliliters of 5.5M H2so4 must you use to prepare 500ml of 0.2M sulfuric acid solution? Please hurry!!!!!!

*December 14, 2012*

**social studies**

Please help! this is my worst subject! How did land-owning companies take advantage of the Homestead Act?

*December 9, 2012*

**Chemistry**

0.189

*November 20, 2012*

**math**

WHAT IS THE ANSWER TO THIS PROBLEM? (WRITE TWO DIFFERENT NUMBERS WHEN ROUNDED TO THE NEAREST TENTH EQUALS 18.3

*September 26, 2012*

**physics**

A cement block accidentally falls from rest from the ledge of a 52.0 -m-high building. When the block is 11.5 m above the ground, a man, 1.80 m tall, looks up and notices that the block is directly above him. How much time, at most, does the man have to get out of the way?

*September 6, 2012*

**statistics**

How do you calculate the slope and intercept of a regression?

*May 22, 2012*

**math**

What is the scientific notation for 15 x 10 to the 5th?

*February 26, 2012*

**Calc 1**

Answer is 12250

*February 24, 2012*

**Calc 1**

A farmer with 700 ft of fencing wants to enclose a rectangular area and then divide it into four pens with fencing parallel to one side of the rectangle. What is the largest possible total area of the four pens?

*February 24, 2012*

**chemistry**

How do you properly solve _ Ag + _ Cu(Nu3)2 ---> _ AgNo3 + _ Cu

*December 17, 2011*

**Math**

3/20

*December 5, 2011*

**physics**

suppose a plane drops water from 1024 feet. how many seconds will it take for the water to hit the ground?

*October 19, 2011*

**science**

what nutrient works as a muscle builder and body repair worker

*October 18, 2011*

**Chemistry**

The answer is 5.73 moles Au

*September 25, 2011*

**Bio**

What role does DNA play in helicase?

*January 26, 2011*

**algebra**

48 programs

*October 21, 2010*

**algebra**

megan paid 1.50 each for programs to the game. she sold all but 20 of her programs for 4.00 each. even factoring in the money she lost for not selling all the programs, she still made a profit of 45.00. how many programs did megan buy in the first place?

*October 21, 2010*

**Calculus**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=0, y=x(3-x) about the axis x = 0

*August 2, 2010*

**Physics: Sound Waves**

Going to be about 1-2 hertz fyi, 345/pipe1 345/pipe2 and difference

*July 16, 2010*

**apush**

Ya, the answer is D

*April 9, 2010*

**chemistry**

if 5g of CH3COOH reacts how many moles of CO2 will be produced?

*February 16, 2010*

**chemistry**

What volume (in mL)of 0.0550 M calcium hydroxide is required to neutralize 38.00 mL of 0.0700 M nitric acid?

*September 30, 2009*

**chemistry**

What volume (in mL) of the base will react completely with 30.00 mL of 0.550 M HCl? 0.0500 M Ba(OH)2

*September 30, 2009*

**chemistry**

Bornite (Cu3FeS3) is a copper ore used in the production of copper. When heated, the following reaction occurs. 2 Cu3FeS3(s) + 7 O2(g) 6 Cu(s) + 2 FeO(s) + 6 SO2(g) If 3.88 metric tons of bornite is reacted with excess O2 and the process has an 75.6% yield of copper, what mass...

*September 9, 2009*

**chemistry**

Nitrogen (N2) and hydrogen (H2) react to form ammonia (NH3). Consider a mixture of six nitrogen molecules and six hydrogen molecules in a closed container. Assuming the reaction goes to completion, what will the final product mixture be? number of NH3 molecules? number of N2 ...

*September 9, 2009*

**math-word probblem**

Case Eastern Junior College awarded 26 varsity letters in crew, 15 in swimming, and 16 in soccer. If awards went to 46 students and only 2 lettered in all sports, how many students lettered in two of the three sports? is the answe 13 lettered

*August 9, 2009*

**math**

how do i solve y less than or equal to -2x+1

*February 23, 2009*

**Physics**

so i would do.. 23N - friction= 3.1(or 30.38N) *.5 and get f=7.81 then 7.81 = mu k * mu g ?

*October 30, 2008*

**Physics**

A force of 23.0 N is required to start a 3.1 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 23.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of kinetic ...

*October 30, 2008*

**science/biology**

how will a goldfish respond if i put it in salt water

*September 30, 2008*

**science**

What is phmpoc?

*August 19, 2008*

**math... help me.. please =)**

well i think it's 1) 4x sq.root7 2) 5x just basically sq. root them(for the exponent divide by the root(since its square root it's 2 you divide by)

*May 11, 2008*

**Chemistry**

Kirsten is in her lab, and reacts two unknown gases (A(g) and B(g)) to get nitrogen dioxide (NO2). Using her data, she is able to write the following balanced equation: 2A(g) + B(g) --> 2NO2(g) If she started with 8 L of A(g) and 3 L of B(g), how many liters of NO2(g) would...

*December 2, 2007*

**Chemistry**

I'm not doing so well in ap chemistry. i think i'm not studying the right way. can anyone suggest how i can raise my grade? i do my homework but it doesn't seem to help.

*October 14, 2007*

**Science**

If your house is heated by a furnace that blows hot air into the rooms, you are depending on the process of ______ to stay warm. Choices are: convection, radiation,conduction, heat

*October 2, 2007*

**math**

yo just give me the answer straight cause i have no idea what that means

*September 26, 2007*

**math**

-2x + 4(2x - 9)

*September 26, 2007*

**maths**

Thanks Bob, but I don't need the formular just the answer. Once again thank you

*September 23, 2007*

**maths**

How far does a train travel going at 20mph for 45 seconds? And har far will it travel at 13mph for 58 seconds? Thanks

*September 23, 2007*

**math**

which 3 are correct a) if x= -10^4 then log10 x = -4 b)if x= 2^8 then log 2x = 8 c) log2 2= 4 d) if x= 3 then log10 3=x e) log 10 256-2log 10 16=0 f)log 10 (a-b)= log 10 a/log 10 b g) the gradient of the graph of y= 2e^x at x= 2 is 2e^2 h) the gradient of the graph of y= e^x ...

*May 12, 2007*

**math help**

Posted by grant on Saturday, May 12, 2007 at 9:20am. The table shows the depth (d metres) of water in a harbour at certain times (t hours) after midnight on a particular day. time t (hours) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 and the in the next column corresponding to the figures...

*May 12, 2007*

**math**

The table shows the depth (d metres) of water in a harbour at certain times (t hours) after midnight on a particular day. time t (hours) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 and the in the next column corresponding to the figures above is depth d (m) 3.0 3.3 4.2 5.6 7.2 8.2 9.0 8.9...

*May 12, 2007*

**math**

The table shows the depth (d metres) of water in a harbour at certain times (t hours) after midnight on a particular day. Time t (hours) Depth d (m) 0 3.0 1 3.3 2 4.2 3 5.6 4 7.2 5 8.2 6 9.0 7 8.9 8 8.1 9 7.3 10 5.6 11 4.3 12 3.5 13 3.1 Use the regression facilities on your ...

*May 12, 2007*

**Career Question**

Hi everyone, I've got a career-related question. A few weeks ago, our class took a "Career Cruising" quiz, which is meant to help students explore career options that correspond to their interests and talents. Based on my quiz answers, my homeroom teacher ...

*March 8, 2007*

**Quantum Physics**

Each element has a different set of energy levels. Use this fact to "explain" whay the colour of the light emitted by an element in the gaseous state is characteristic of the element. When an electron falls from one of the higher energy levels to a lower energy level...

*March 6, 2007*

**Science**

A drop of oil (volume 0.05cm3) is released from a medicine dropper on to the calm surface of a pond where it spreads out to cover an area of "40cm2". Assume that the oil film has a uniform thickness equal to the diameter of a oil molecule. Calculate the diameter of ...

*March 6, 2007*

**French**

what does trousse mean in French?

*January 13, 2007*

**Math: Checkboard Squares**

In the formula how do you know to divide by six?

*October 30, 2006*

**Distributive property**

I NEED HELP

*September 20, 2006*

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