# Posts by ann

Total # Posts: 1,480

Calculus
The height in feet above the ground of a ball thrown upwards from the top of a building is given by s=-16t^2 + 160t + 200, where t is the time in seconds. If the maximum height is 600 feet, what is v^-1(32)? The answer is supposed to be 4 seconds, but I don't understand ...

algebra
Mary has a total of \$5000 invested in two accounts. One account pays 5% and the other 8%. Her interest in the first year was \$331. Write and solve a system of equations to find out how much she has invested in both accounts

geometry
If I need to make a mold with a square base with a volume of exactly 28 cubic centimeters how many possible molds could I make?

chemistry
its actually my fault sorry :\$ , i wrote the question wrong its barium oxide + water so would it be BaO + H2O --> Ba(OH)2 ??

chemistry
oh so for barium + water the chemical equation is BaO + H2O but how do i figure out the rest?

chemistry anyone??? help!!
help me please!! i don't get it

chemistry
what is the chemical & word equation of sulfur dioxide + water i don't understand this, can someone please explain to me how to do this!!?

literacy
thankyou Ms.Sue!! :D

literacy
can i just show u tomorrow then if u don't mind? please and thank you !! :)

literacy
its not really for a class i'm just practicing for the osslt test. so will u actually mark it and give feedback??

literacy
and also i have another question. if i write me news report will u pleasee give it a level out of 6 ??

literacy
so should it be: "a major ice storm shuts down the region of ... on january 27 2012" ??

literacy
so can my lead sentence be " on january 27 2012 a major ice storm shut down the whole region of ..." ??

literacy
how do you write a news report on the topic "storm shuts down region"??

literacy
oh okay thanks!! (:

literacy - Ms. Sue???
will u mark them and give it a level?

literacy
im in grade 10 and if i do the osslt literacy practice tests. will someone on here mark my writing tasks? i can mark the multiple choice questions on my own but i just need someone to mark the writing stuff

Chemistry
find the freezing point of a solution containing 3 grams of a compound of molar mass 125 g/mol in 45 g of camphor

Chemistry
Dissolving solid CaCl2 H2O in a large volume of water is endothermic to the extent of 14.6 kj/mol. Also given: CaCl2(s)+6H2O(l)->CaCl2* 6H2O(s) delta H = -97.0 kj what is the heat of solution of anhydrous CaCl2 in a large volume of water?

Chemistry
Dissolving solid CaCl2 H2O in a large volume of water is endothermic to the extent of 14.6 kj/mol. Also given: CaCl2(s)+6H2O(l)->CaCl2* 6H2O(s) delta H = -97.0 kj what is the heat of solution of anhydrous CaCl2 in a large volume of water?

Chemistry
What is the percent KCL by mass in a 3.00 molal solution?

chemistry
What is the percent KCL by mass in a 3.00 molal solution?

math
Center C has a radius of 13.Chord AB=10. Find the distance from the center of the circle to chord AB. CD=?

geometry
center C has a radius of 13.Chord AB=10.find the distance from the center of the circle to chord AB. CD=?

geometry
T or F two coplanar circles with two points of intersection will have four common tangents?

Skeletal muscles contract when their (A)__________ shorten, using the energy source ATP. A rise in the concentration of (B)__________ ions causes muscle contraction.

From the esophagus down, the 6-9 meter long digestive tube is made up of four layers: the inner (A)__________ of epithelial cells, a sub mucosa, smooth muscle, and serosa. Nutrients from the tube are absorbed across the layers into the bloodstream. (B)__________ are circular ...

whiich of these fit together A. lipase B. nuclease C. pancreatic amylase D. pepsin bread crumb stuffing butter mashed potatoes turkey

The Golgi body receives proteins from the (A) __________, "packages" those proteins and "ships" them to other areas of the cell, or to the (B) ________ for secretion.

The __________ (the cell’s outer border) controls the movement of materials into and out of the cell. It is called a lipid bilayer because of the type of molecules it is made up of and it has two layers

human biology need help
The Golgi body receives proteins from the (A) __________, "packages" those proteins and "ships" them to other areas of the cell, or to the (B) ________ for secretion.

Sequences of chemical reactions, called metabolic pathways, can be sped up, or catalyzed, by (A) __________ , which are made mostly of (B) ___________.

Calculus
Determine the equation of the inverse function if f(x) = 2x^2+3, and x≥0. The answer is supposed to be f^-1(x)=[√(2x-6)]/2. This is what I did: x=2y^2+3 2y^2=x-3 y^2=(x-3)/2 y=√[(x-3)/2] Did I do something wrong? Thanks!

Calculus
If f(x)= -4x^2+7 and x≤0, what is the equation of the inverse function? The answer is supposed to be f^-1(x)= -[√(7-x)]/2, but this is what I did: x=-4y^2+7 -4y^2=x-7 y^2=(x-7)/-4 y= √[(x-7)/-4] Did I do something wrong? By the way, for the original function...

math
There are eight shelves. How many soup cans a grocery clerk stack if the bottom shelf has 21 cans and each additional shelf has 2 fewer soup cans than the previous shelf?

math
using the interest formula A=P(1+r/n), solve for the indicated variable. solve for P

Math
Eric has two rock samples. One has a mass of 600 grams and the other has a mass of 1 kg. He recorded the total mass as 7 kg. What did he do wrong? What is the correct answer?

College Cultural Geography
"Respect for traditions that violate human rights is taken by Western universalism as tantamount to disrespect for their victims." What about this part?

College Cultural Geography
Can someone explain what this paragraph is talking about? I do not understand it. "But Western universalism, again, has two faces: it also promotes the principles of liberty and equality throughout the world. It is not possible to proclaim global human rights, on the one ...

Algebra
250

physics
A 400 g marble block has a specific heat of 860 J/kg C deg. If the block is placed in 700 ml of water, the marble changes it temperature by 17 Celsius degrees. Since the specific heat of water is known to be 4186 J/kg C deg, what is the temperature change of the water. (The ...

physics
A wave travels at 575 m/sec in a dense media. The wave is observed to The length of the media is 95.8 cm. When the wave is reflected at the end, its phase is reversed (an upward motion becomes a downward motion.) What is the frequency of the resonant wave in this media?

physics
The speed of sound in air varies with the temperature and humidity of the air. In dry air at 20 degrees Celsius, the speed of sound is approximately 343 m/sec. A closed tube resonates with a node at each end for a sound wave in air. What is the length of tube you would choose ...

Physics
1200kg car moving at 9.72m/s runs into and sticks to a parked 1000kg car. The collision takes 0.15s and after the crash the cars wheels lock and they skid to a stop on the u=0.40 road. what is the distance travelled before skidding to a stop?

Thesis Statement
Weak, because you should mention specifically what is it about your experience with teaching children that you want to write about.

Calculus
Thanks so much Reiny! I never thought of adding the cost to the equation, but now I know.

Calculus
A holding pen for fish is to be made in the form of a rectangular solid with a square base and open top. The base will be slate that costs \$4 per square foot and the sides will be glass that costs \$5 per square foot. If the volume of the tank must be 50 cubic feet, what ...

math
If an apartment complex will need painting in 3 1 2 years and the job will cost \$25,000, what amount needs to be deposited into an account now in order to have the necessary funds? The account pays 12% interest compounded semiannually.

physics
How far from Earth will Venus be today?

Astronomy
What five object were found in the sky on February 5, 2014 at 9 pm.

Astronomy
a.According to the Starry Night program, which constellation the Sun was actually in at the instant of a person birth on August 12, 1953. b. What was the right ascension of the Sun on the moment a person was born on August 12, 1953. c. What constellation is this position in?

maths
a grocey man sells 300 apples at Rs 50 per dozen. he sells 200 apples from it at Rs 50 for 10 apples. what will the price per apple for the remaining apples to get an overall profit of 12%

Physics
A hydrogen atom in an excited state emits a Balmer beta photon followed by a Lyman alpha photon. The electron decay from: the first excited state to the ground state, the second excited state to the ground state, the third excited state to the first excited state to the ground...

Physics
What is the peak wavelength and observed color of a 50,000 K star?

math
donna brings 32 slices of apples and oranges to the party. there are 3 times as many oranges than apples. how many apples are there

biostatistics
Seventeen people has been exposed to a particular disease. Each one independently has a 40% chance of contracting the disease. A hospital has the capacity to handle 10 cases of the disease. What is the probability that the hospital's capacity will be exceeded? a- .011 b- ....

statistics
Height of children in kindergarten described by normal mode with mean 39.2 inches and standard deviation of 1.9 inches. What percent of children can expect to be less than 38 inches tall?

Pre-Calculus
Actually I figured out that you use both, and ended up with 16x^7(x^2-9)^7 + 6x^5(x^2-9)^8. but I don't understand how that simplifies to 2x^5(x^2-9)^7(11x^2-27)?

Pre-Calculus
Find dy/dx if y= x^6[(x^2-9)^8]? So the answer is supposed to be 2x^5[(x^2-9)^7](11x^2-27), but I don't understand how to get it. Do you use product rule, chain rule or both? thanks

Math
An athletes long jump rounded to the nearest metre was 8 m. Whar are the longest and shortest lengths the jump could have been in decimals to the hundredths ?

Math
An athletes long jump rounded to the nearest metre was 8 m. What are the longest and shortest lengths the jump could have been in decimals to the hundredths.

geometry
Calculate lengths of ap,bp,cp. A(0,0) B(0,2k) C(2h,0) P(h,k)?

algerbra
sasha researched the size of zoos in her state. she found that the zoo in the north part of the state is almost twice as large as the zoo in the south. she also found that the zoo in the south part of the state has 200 fewer than twice the number of animals as the northern zoo...

math
find the slope of the linethat passes through the given points (4,6) and (4,4)

reimbursement methodologies
which of the following was the governments way of controlling skyrocketing health care costs?

Pre-Calculus
y= ((2-3x^(1/x))/(2+3x^(1/x)) Is the horizontal asymptote y= 1 or y= -1?

Pre-Calculus
Is it possible to factor x^3 - 9x^2 + 24x - 20 and solve for x by hand? I tried using the grouping method and got x^2(x-9) + 4(6x-5) but how can I continue solving for x? If I use a calculator I get x= 2 and 5 but is it possible to find this by hand? thanks

math
Evaluate definite integral of (2x+2)(x^2 + 2x -5)^5dx upper limit 2 and lower limit 1

music
I need help I'm about to take my Comprehensive Final Exam on Foundations of Music A STEP BY STEP APPROACH TO MUSIC THEORY. I'm so confused I don't want to fail my test I failed the last two I'm afraid of failing. Please help me.

Math
Oh I think I know what I did wrong now

Math
Cassandra is two thirds as old as Jeremy. Three years ago she was half as old as Jeremy. How old are Cassandra and Jeremy? I got this question wrong and was wondering what I did wrong. This is what I did. Now 3 years ago Cassandra| C | C-3 Jeremy | J | J-3 C=2/3J C-3=1/2(J-3...

Pre-Calculus
Solve the equation 2x + 5y - 3z = -1. Write the general solution as a matrix equation. I did some guessing and ended up getting this much: [x]= [-1/2 _ _ ] X [1] [y]= [ 0 1 0 ] X [s] [z]= [ 0 0 1 ] X [t] however I still can't figure out the last two values in the first row

Pre-Calculus
I still don't really understand how to do it... I did some guessing and ended up getting this much: [x] [-1/2 _ _] [1] [y]= [0 1 0] X [s] [z] [0 0 1] [t] however I still can't figure out the last two values in the first row.

Pre-Calculus
[x] [...] [1] [y]= [...] X [s] [z] [...] [t] to align it better I put dots in the blanks...and I think s and t are free variables that be be any real number

Pre-Calculus
Solve the equation 2x + 5y - 3z = -1. Write the general solution as a matrix equation. [x] [ ] [1] [y]= [ ] X [s] [z] [ ] [t] I'm supposed to fill in that blank in the middle, but I don't understand how to solve this if I'm only given one equation. please explain

Pre-Calculus
if not, then can you show me how to do this with the substitution method or something?

Pre-Calculus
Consider the chemical reaction aC2H6 + bCO2 + cH2O → dC2H5OH, where a, b, c, and d are unknown positive integers.? The reaction must be balanced; that is, the number of atoms of each element must be the same before and after the reaction. For example, because the number ...

Pre-Calculus
wow that was a silly mistake I didn't see the x next to 500 and thought I could just subtract it from 1000 thank you!

Pre-Calculus
A piece of equipment has cost function C(x)=50x^2 + 1000 and its revenue function is R(x)= 500x - x^2, where x is in thousands of items. What is the least number of items that must be sold in order to break even? 50x^2 + 1000 = 500x - x^2 50x^2 + x^2 + 500= 0 51x^2 + 500 = 0 ...

Pre-Calculus
Wow, I didn't realize that finding (x-2) was already finding the equation of the line. Thanks!

Pre-Calculus
The graph of f(x)= (x^2 - 11x + 18)/(x-9) consists of a line and a hole. Find the equation of the line and the coordinates of the hole. I really have no idea how to do this. I tried factoring it and ended up with (x-2), but I don't know how that helps me. please help

Pre-Calculus
oh yeah thanks I forgot that the reciprocal had to be negative

Pre-Calculus
What is the equation of the line passing through (4, 2) and perpendicular to the line passing through the points (9,7) and (11,4)? Here's what I did: (7-4)/(9-11) = -3/2 y-2= (-2/3)(x-4) y-2=(-2x/3) + (8/3) y = (-2x/3) + 14/3 but the answer key says that it's y=(2x/3...

Pre-Calculus

Pre-Calculus
Find the slope of the tangent line to the curve 2(x^2+y^2)^2=25(x^2−y^2) at the point (−3,−1)? Here's what I did: 2(x^4 + y^4) = 25(x^2-y^2) 2x^4 + 2y^4 = 25x^2 - 25y^2 8x^3 + 8y^3(dy/dx) = 50x - 50y(dy/dx) d/dx(8y^3 + 50y) = 50x - 8x^3 d/dx = (50x-8x^3...

Pre-Calculus
thanks

Pre-Calculus
no it's actually 1x and 1xy. It's not division.

Pre-Calculus
Find the slope of the tangent line to the curve √(1x+2y) + √(1xy) = 8.24 at the point (2,8)? I know you have to use implicit differentiation, but the radicals keep making me mess up algebraically. Is the changing the radicals to exponents the fastest way? please ...

Pre-Calculus
nevermind I made a mistake it's p(x)=-1x/10 + 465

Pre-Calculus
A manufacture has been selling 1050 television sets a week at 360 dollars each. A market survey indicates that for each 20 -dollar rebate offered to a buyer, the number of sets sold will increase by 200 per week. p(x)=1x/10 + 465 How large of a rebate should the company offer ...

Pre-Calculus
Thank you all so much!

Pre-Calculus
When you do implicit differentiation, how does D = √(x^2 + 8x + 12) turn into dD/dt = [(x + 4)(dx/dt)]/√(x^2 + 8x + 12)? please explain...I don't even understand where the (x+4) comes from. D means distance, but that's irrelevant

Physics
laf is standing on a sheet of ice that covers the football stadium parking lot in Buffalo, New York; there is negligible friction between his feet and the ice. A friend throws Olaf a ball of mass 0.400kg that is traveling horizontally at 11.5m/s . Olaf's mass is 65.2kg. If...

math
Customer number 2

math
Customer number 1

physics
In the construction of bridges and skyscrapers, gaps must be left between adjoining steel beams to allow for the expansion and contraction of the metal due to heating and cooling. The temperature of a sample of iron with a mass of 10.0g changed from 50.4oC to 25.0oC with the ...

Science
a wagon that has a mass of 8kg? If the net force on a wagon is 4N, what is the wagon’s acceleration?

Pre-Calculus
thanks

Pre-Calculus
How is -16/(4x+6)^5 and -1/(2(2x+3)^5) equivalent? I think -1/2(2x+3)^5 is the more simplified version of the two, but I just can't figure out how -16/(4x+6)^5 simplifies to -1/(2(2x+3)^5). please explain