Saturday
August 2, 2014

Posts by marina


Total # Posts: 119

Math
Express sin(x+y+z) in terms of cosines and sines of x, y and z

Math
An isosceles triangle has an area A, an apex angle 2 theta, and a height of h. Determine an expression for theta in terms of A and h.

Physics
Starting from rest, a horse pull a 250-kg cart for a distance of 1,5km. it reaches a speed of 0,38m/s by the time it has walked 50,0m and then walks at constant speed.fictional force 260n.each gram of oats the horse eats releases 9kJ of energy. 10% of this can go into work the...

Math
The table shows the number of people switching to a new telecommunications company over a 7-day period in August. Day=number of people 1=10 2=17 3=37 4=79 5=106 6=231 7=500 Using this estimate how many people will switch on august 31st. * it's an exponential and logarithmi...

Math
The table shows the number of people switching to a new telecommunications company over a 7-day period in August. Day=number of people 1=10 2=17 3=37 4=79 5=106 6=231 7=500 Using this estimate how many people will switch on august 31st. * it's an exponential and logarithmi...

pre-calculas
correction of problem. Should be: -2x squared + 6x + 5 = 0 Sorry about that! Thanks for your help!

pre-calculas
Use "completing the square" to find the zeros of the polynomial. =2x squared + 6x + 5 = 0

pre-calculas
find the LCD and solve: x+3 12x + 4 1 - 2x ____ + _________ = _______ 3-x x squared - 9 x + 3

pre-calculas
simplify the following complex fraction: x ____ -2 x-5 _____________________________________ x squared - 9x - 10 ____________________ x squared - 25

pre-cal.
simplify: 2(x+h)squared+5(x+h)-6-(2x squared + 5x - 6)

pre-calculas
rationalize the denominator: 5 + the sq. rt. of 3 ________________________ 4 + the sq. rt. of 3

physics
A girl with a mass of 83 kg is climbing in a tree 20 m above the ground. If she lands on a trampoline with a constant of 312 N/m, how far will the trampoline stretch and how fast will she be moving just prior to landing on it?

physics
A bomb is dropped out of a plane 100 m above the ground, how fast will it be moving when it hits the ground?

physics
A golfer hits a ball off a tee from an elevated platform 13m above the ground. if the golf ball leaves the tee at 85 m/s @ 15 degrees, find the flight time, the maximum height above the ground and the horizontal displacement of the golf ball.

physics
A soccer ball is kicked off of the ground at 17 ft/sec @ 30 degrees. Determine the maximum height above the ground the ball reaches and how far downfield the ball lands.

physics
A boy runs off the edge of a 5 foot high wall @ 2.5 ft/sec. How long will he spend in the air? How far from the base of the wall will he land?

physics
How much force is needed to accelerate a 125 kg block up a 35 degree include at 3.4 m/s2 if the coefficient of friction is 0.28?

physics
A 625 N crate, which is at rest on the floor, is pulled along the floor by a horizontal force of 85 N. The coefficient of friction is 0.11. How far will the crate go in 4.5 seconds?

physic
What is the necessary coefficient of friction needed to keep a 1200 kg car on a road moving at a speed of 27 m/s on a turn with a radius of 30 meters?

physics
Two cables suspend a 500 N sign above the hallway. The left cable makes a 40 degree angle with the ceiling and the right cable makes a 50 degree angle with the ceiling. What is the tension in the left and right cables?

physics
What is the apparent weight of a 55 kg person in an elevator accelerating downward at 2.2 m/s2?

physics
25x 45 = 1125 9.6 meters = 9600 km 9600/2 = 4800 1125/4800 = .234375

physics
Compute the force of attraction between a 25 kg. mass and a 45 kg. mass that are 9.6 meters apart from center to center.

physics
A 50 foot see-saw has 4 kids sitting on it. A 62 lb. girl sits on the left end, with a 76 lb. girl sitting 2.5 feet in front of her. On the right side, a 96 lb. boy sits on the end and has another boy sitting 2.5 feet in front of him. How much does this other boy weigh?

algebra
How do i write an equation of a line with the given slope and y-intercept for m= 2/9, b=3?

world geography
The largest mass migration in human history has taken place in china. why ?

Biology
Caenorhabditis elegans hermaphrodites have six different homologous chromosome pairs: five pairs of autosomes (called I-V) and one pair of sex chromosomes (called X). Hermaphrodites can either self-fertilize or they can be fertilized by males (which only have one X chromosome ...

Chem
An analysis of generic antacid tablets labeled to contain 250mg of CaCO3 (MM= 100.09g/mol) per tablet of active ingredient was performed. The analysis was performed by dissolving a 0.550g sample of the antacid tablet in 75.00mL of 0.1055M HCl. The excess acid was back-titrated...

calculus
Find all vales for a so that f(x) { x+1...x<=a { x^2...x>a is continuous

calculus
If lim(f+g)=1 as x-->a and lim(f-g)=1 as x-->a find lim fg as x-->a

Algebra
Could you elaborate on how you got that answer

Algebra
Factor x^4+64

10th grade trigonometry
A wheelchair ramp is said to have an angle of 4.5° with the ground. the deck at the top of the ramp is 20 inches above ground level. a) how long should the ramp be? round your answer to the nearest tenth of an inch. c) how far from the deck should the ramp begin? Round you...

Math
circle the word that completes each sentence

college application
i am using common app and they asked to write about : Indicate a person who has had a significant influence on you, and describe that influence. so is it only one person or could be more?

French
Hi! This is my final French paper and I would be really appreciative if someone could look it over before I turn it in. Merci! Le Mariage de ma Mère et Michael Dans ma vie, je me souviens des évènements plus que les autres, et certains sont plus importants...

College Algebra
In an assembly line of a factory, which produces networking switching hubs, two robots are utilized. The first one (A) is able to produce 40 microchips per hour, whereas the second one (B) produces 30 microchips per hour. For a total production of 400 microchips, the two robot...

World History Honors
What kinds of people sailed to the New World in the 1400s?

World History Honors
What kinds of people sailed to the New World in the 1400s?

biology
draw digrams of phases of meiosis in a cell with 2N=. include with both divisional sequence, but not draw any of the subdivision of the phase e.g early prophase. distinghish between chromosomes from each parent, and detail the event of synapsis, recombination and crossing over...

mat
you are correct that 12.5555... is a rational number equal to 113/9, but how did you know that? Which characteristic exactly indicates that 12.5555... can be written as a fraction?

chemistry
Thx! for Mole of H2O: I took 76g since it is 100g of 24%NaOH solution ???? Then, Mole of H2O: 76/18=4.222 Mole of NaOH: 24/39.997=0.6 Total moles: 4.222+0.6=4.822 X1=4.222/4.822=0.876 P1=0.876x760=665.76 mm Hg

chemistry
Pvap (mm-Hg) of 100g 24%NaOH in H2O @100C? When Pvap pure H2O @100C is 760mm-Hg Pls where to start solving this problem? What is the equation? What are the staeps to get to the right answer?

Arabic
how about in arabic.

Arabic
I need to know the root word for atlas in arabic?

Geometry
The line m has the equarion y= 2x + 1. The line n is perpendicular to m and passes through the point A(2,1). Write an equation of n

English
I am writing an essay about why marriage is an important institution. I have several ideas such as financial benefits,more stability,more appreciation by the society. What other benefits of marriage are out there? Thank you in advance!

physics
the constant velocity of a ball is (3x+2y)m/sec. find the distance traveled in the y direction in 2 seconds (x and y are unit vectors)?

Sat prep English
Thank you!

Sat prep English
1.plays 2.play 3.play ....I think lol

Sat prep English
Choose the word which best completes the sentence Neither the cat nor the dog (play, plays) together. And Neither the cat nor the dogs (play, plays) together. And Neither the cats nor the dogs (play, plays) together.

math
of 500 employees, 200 participate in a company's profit- sharing plan (P), 400 have major-medical insurance coverage (M). and 150 employees participate in both programs. Construct a Venn diagram and find out hte probability that a randomly-selected employees will be a part...

Math help please
1.) 4(2-a)^2-81 2.) -(x-y)^3 3.)3x^2-27(2-x)^2 4.) 9(y-1)^2-25

geometry
in the xy coordinate plane point b (-3,2) and point d (3,-4)are opposite vertices of square abcd if point h is the midpoint of line segment bc what is the area of triangle ahd ?

social studies
who were among the settlers at sagadahoc and who was thier leader?

Latin
Thank you both very much. I really appreciate you guys helping all of us kids that use Jiskha. Marina

Latin
The blanks are where I'm supposed to put the English form of that word. And that site was good, but not what I was needing.

Latin
Hey I need help finding the English meaning of each of these Latin words. 1 habeo to have 2 3 habemus 4 5 habes 6 you have 7 habetis 8 9 habet 10 11 habent 12

math
30

math
40 children in the class 3 out of every 4 wears jeans how many students in the class are wearing jeans?

English
As an English teacher where would i go in ENgland and Why??

english grammar
I rememmber i always did the best I could when I was young.

Learning Chater School
Dana has a piggy bank(she is just starting to save money in her piggy bank). 1- All of the coins in her bank expect two quarters. 2- All of the coins in her bank except two are nickels 3- All ofthe coins in her bank except two are pennies . How much money does Dana have in her...

Chemistry
I'm having some difficulty getting the answer...I completely follow your logic and your numbers make sense, but I end up getting 1.129 as my final answer while the back of the book says it should be 0.00767....

Physics
A projectile is fired straight up from a cliff which is 200 feet above ground with an initial velocity of 220 ft/sec. Assume that the only force affecting the projectile during flight is from gravity which produces a downward acceleration 32 ft/sec^2. Find an equation from the...

Math
A projectile is fired straight up from a cliff which is 200 feet above ground with an initial velocity of 220 ft/sec. Assume that the only force affecting the projectile during flight is from gravity which produces a downward acceleration 32 ft/sec^2. Find an equation from the...

algebra 1
Bushes that bites kass kass had been doing yard work all summer to save for a new bike and ms oleonary had asked her to plant a row of barberry bushes on each side of her drive way. se specified to kass that there should be a 1 foot space between the bushes, which would grow t...

English
If anyone has read the novel the power of one can you tell me the individuality peekay displayed in the novel?

english
What journey did othello go through both physical and emotional in the play ?

biology
can someone explain in simpler term what a nonvascular plant is? please and thank you (:

language could you please check my work
true(t) or false (f) 1)f reading is not a real hobby 2)f an activity that is done outdoors is not a hobby 3)t photography is a popular hobby 4)t building a cabnint can be part of a hobby 5)f cooking is never considered recreation 6)t model building is very educational 7)f hobb...

biology
in humans, the genotype XX results in a ____ any help, please?

chem
from the equation : c3h8+5O2=3CO2+4H20 HOW MANY GRAMS OF H2O CAN BE PRODUCED FROM THE REACTION OF 8.5X10^22 MOLECULES PROPANE GAS, C3H8

math
1/6 of 30

physics
Vo=1.50 km Vf=.75 km t=.65 hours x=? x=1/2(Vf+Vo)t x=1/2(.75+1.50)(.65) Multiply all those together to get x which is displacement. Although you might have to change the time to seconds. Because t is seconds and in the problem you have hours.

Science: Physics and Chemistry
Can someone please help me with this??? I was given a systems equation. Two masses are on a flat frictionless surface tied together. There is a pulley type thing and another mass is hanging over the edge of the table. It is attatched to the other 2 masses. It has no Fn, only F...

science
I was given a systems equation. Two masses are on a flat frictionless surface tied together. There is a pulley type thing and another mass is hanging over the edge of the table. It is attatched to the other 2 masses. It has no Fn, only Fg because it is hanging. So I draw line...

Science: Physics and Chemistry
I was given a systems equation. Two masses are on a flat frictionless surface tied together. There is a pulley type thing and another mass is hanging over the edge of the table. It is attatched to the other 2 masses. It has no Fn, only Fg because it is hanging. So I draw lines...

4th grade
WANT TO HELP MY DAUGHTER BUT NOT UNDERSTAND. MARTHA KATZ'S THE TOWNSPEOPLE'S

American Literature
So for my class, I have to write a poem with these guidlines: 1. You have to include 3 elements of romanticism. 2. It doesn't have to rhyme, but it must have a certain rhythm. 3. You should make it iambic, trochaic, tetrameters, etc... 4. It must be at least 16 lines. How ...

child development
They want you to finsih the question. You said "Rank the perspectives of language development in order of importance. Explain why you feel your first choice is the most important." Yeah well what perspectives? List them out in the question, otherwise no one can help ...

biology
1. name an organism in which the respiratory and circulatory systems are separate. 2. name an organism with a closed circulatory system that is not used for gas exchange. 3. name an organism whose waste gases accumulate in one system but then move to another system for removal...

mth/213
Let U = {u, n, i, t, e} A = {n, i, t} B = {n, e} C = {u, n, i, t, e} D = {u, e} Find each of the following: (a) A ¿B

english
Recognition of incongruity (difference) between what is seen and what is accepted. ~inference or irony

biology
what are organisms that can synthesize energy-containing organic compounds? organisms that add to the total energy stored in organic compounds? organisms that require sunlight in order to survive? choices: a) autotrophs b) heterotrophs c) both any help is greatly appreciated! :)

biology
does isomerism exist in double sugars?

calculus - limits
In the theory of relativity, the mass of a particle with velocity v is m = m0 / sqrt(1-v^2 / c^2) where m0 is mass of the particle at rest and c is the speed of light. What happens as v approaches c^-?

algebra
f(x) = x+ 1 g [f(x)] = x g(x) = ?

business law
Libertarians are also referred to as economic socialists. True Is that right?? The Defence of Necessity would likely have been successful in Latimer's case if his defence lawyer could have proven that this daughter Tracy wanted to die. Question 8 answers False Positivists ...

business law
Libertarians are also referred to as economic socialists. True Is that right?? The Defence of Necessity would likely have been successful in Latimer's case if his defence lawyer could have proven that this daughter Tracy wanted to die. Question 8 answers False Positivists ...

Pre-Algebra
the world wobbl e contests? i dunoo pre-algebra sucks

economics
out of the $875 billion in circulation, how much counterfeit money is in the U.s.?

English/Grammer
My teacher didn't explain today's lessons about complete and simple predicates and subjects. How do you identiy them and what are they? Please give examples and explain them throughly.

Chemistry
sinks in A, floats in B, Floats in C

history
In England in the 1700's, many poor people in rural areas left their farms and moved to cities in search of work. Yet life in cities was not easy, and jobs were very hard to find. from what you know about England in the 1700's, can you explain why so many people were l...

wizardry
i need help with spells like the transformation spell

wizardry
thx jasimine

wizardry
ms sue no links to everyone

wizardry
The teacher asked me how to become a wizard and i forget help me and do not say wizards are fake cuz they are not

Math
4 paper backs and 4 hard cover

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