# Posts by Natalia

Total # Posts: 80

Algebra
Richard takes 35 minutes to mow a lawn, but with the help of his friend Joe it only took him 15 minutes. If Joe worked alone, how long would it take Joe to mow the same lawn?

Algebra 1
A city planning committee surveys 100 people waiting at a bus stop about the expansion of the public transportation system. Is this an example of a: random sample, systematic sample, self-selected sample, convenience sample, bipartisan sample, or stratified random sample? I ...

Algebra 1
Simplify using long division. (remember to show all your work.) 3. (72-8x^2+4x^3-36x)/(x-3) 4. (8b^3-6)/(2b-1) simplify the expression, if possible. state the excluded values, if any. 5. 10x^2-25X+15^5x-5 6.2w^2-18^w^2+6w+9

Algebra 1
Graph each function, identify the domain and range, and compare the graph with the graph of y=x^1. 1.y=x^-10 Domain: Range: compare: 2.y=x+3^1+3 Domain: Range: compare: solve and graph.

Math
How to put 0.46 ,0.6 , 0.41 from least to greatest

Calc
Hello! Really can't wrap my head around this so please help! Consider the function: f(x) = x^2+(1000-x)^2 First find out where it is increasing, and then use this fact to determine which number is larger: a) 1000^2 or b) 998^2 + 2^2 I found that the function increases at x...

math
Line segment segment CD has a slope of negative start fraction two over three end fraction and contains point C(−3, −6). What is the y-coordinate of point Q(−1, y) if segment QC is perpendicular to line segment segment CD question mark

Science
Calculate the expansion work done when 50g of water is electrolysis under constant pressure

Which of the following best describes what happens to an enzyme after it catalyzes a chemical reaction? Is the answer to that question correct?

math
The hieght of a model rocket is 4% of the height of the actual rocket.The model is 1.8 meters high. How high is the actual rocket?

zambia school
500ml of gas at 20 degrees celcius is under a pressure of 100cm of mercury what would be its volume at s.t.p?

Physics
Engineering a highway curve. If a car goes through a curve too fast, the car tends to slide out of the curve. A frictional force acts on a fast car to oppose the tendency to slide out of the curve. Consider a circular curve of radius R and bank angle θ, where the ...

Physics
1. A cannon ball M = 10.0kg with V = 2.4×102m/s is broken into 2 parts, if m1 = 6.4kg with angle 37° and m2 with 53°, what is the magnitude of v1 and v2?

Science
A train is traveling west with a force of 820 N, and then the conductor applies the brakes with a force of 500 N. What is the resulting net force on the train?

math
21/8

physics
Find the total displacement of a mouse that travels 1.0m north and then 0.8m south.

Physics
a simple pendulum consists of a 1.5 kg mass connected to a cored without and mass or friction. Initially the pendulum is vertically positioned when a 2.0 kg mass collides with ie, causing the pendulum to displace vertically upward 1.25 m. After the collision, the 2.0 kg mass ...

chemistry
moles of urea:16(g)/60(g/mol)=0.267(mol) 39(g)*1(kg)/1000(g)=0.039kg m=0.267/0.039=6.846(mol/kg)

Geometry
In Rhombus PQRS PQ=3a=7 and QR = 4a-11. What is the value of a?

math
How to multiply long fractions

English 002
Tell us why it is important to use good grammar, proper punctuation and clear senteces when you need to le someone know are displeased.

English
Many days of the year are "national" something or other day. For instance, National French Fry day is in July. Write a paragraph telling your reader what day you'd like to start. Remember to use complete sentences. Remember that all the sentences need to relate ...

English 002
Why complete senteces can help us in our writing at our jobs?

physics
sqrt(2x760)/9.8 = 12s

physics
v= the square root of 2gh

V/CV OR VC/V PATTERN
vfddswWQ

how much did maria bean plant grow between day 2 and day 3?

geometry
<4 and <5 form a linear pair and m<4 = 62. Find m<5.

math elementary
how much did maria bean plant grow between day 2 and day 3

English
what is the adjective in sentence "Sam sees a yellow bus"

The density of water is 62.4 lbs/ft^3. what mass of water in kg will a rectangular can hold if it measures 2.00 ft by 3.00 ft by 6.00 inches?

Chem 1411
al3n2

You have 16 coins that are heads up and 18 coins that are tails up. After you add some coins that are tails up, the ratio of heads up to tails up is 1 to 1.5. How many coins are tails up? How many coins in all?

Math
You have 16 coins that are heads up and 18 coins that are tails up. After you add some coins that are tails up, the ratio of heads up to tails up is 1 to 1.5. How many coins are tails up? How many coins in all?

Physics
A ball of mass 5.0 kg moving with speed of 2.0 m/s in the +x-direction hits a wall and bounces back with the same speed in the -x-direction. What is the change of momentum of the ball?

math
a jet flies with wind at 1100 km/h and against the same wind at 750 km/h.Find the rate of the wind and the speed of the jet in still air.

Chemistry
what is the percent by mass of nitrogen in (NH4)2CO3? how do you do this ?

Chemistry
How many moles of a gas at 100 degrees celciuos does it take to fill a 1.00L flask to a pressure of 1.50 atm?

Chemistry
How many moles of a gas at 100 degrees celciuos does it take to fill a 1.00 flask to a pressure of 1.50 atm?

Physics
23m/s

calculus
Does any tangent to the curve y=ãx cross the x-axis at x= -1? If so, find an equation for the line and the point of tangency. If not, why not?

geography
the wide looping curves which are found along parts of the courses of some rivers are called: a.meanders b.flood plains c.river bluffs d.ox-bow lakes

geography
one of the most recent benefits of the mountaineous regions of some caribbean islands,with their numerous rivers is: a.logging and recreation b.mining for gold and water sports c.eco-tourism and recreation d.hiking and hunting

geography
in the caribbean the potential for hydro electric power is greatest in which of the following groups of territories? a.Trinidad,Jamaica and Barbados b.Guyana,Jamaica and belize c.Trinidad,St.Lucia and St.Kitts d.Guyana,Barbados and the vergin island

geography
some material or load of the river is transported by dumping or hopping from one point to another by force of the water.this is called: a.traction load b.saltation c.solution d.suspension load

biology
a hibiscus plant was attacked by mealybugs which completely destroyed them.the mealybug was said to have thrived because it was not in its natural habitat.what is the likely effect of introducing an organism,like the mealybug,into a new habbitat?

information technology
what are some of the negative impact of sharing information on a network?

biology
a hibiscus plant was attacked by mealybugs which completely destroyed them.what is the relationship between the mealybug and the hibiscus plant.

information technology
discuss the concept of teleconferencing and telecommuting.

information technology
describe the network of presentataion of rind,star and bus.

physics
what are nonrenewable energy sources?

physics
what are renewable energurces?

chemistry
what are the physical properties of sucrose?

physics
what are some questions on work?

physics
what are some questions on momentum?

agricultural science
breeds of broilers in Guyana and breeds of layers in Guyana.

chemistry
an aqueous solution contains 2 solutes A&B.A is soluble in hexane,B is not.Hexane is liquid at rom temperature and does not mix with water.The density of hexane at room temperature is 0.7g/dm3.Describe giving full practical details how you would produce a pue sample of solute A.

chemistry
when is it better to use fractional distillation other than simple distillation?

physics
what are some examples of sources of energy?

chemistry
What are the physical properties of sucrose.

chemistry
A sample of sucrose as been contaminated with sand.How would you purify the sucrose

chemistry
An aqueo solution contains 2 solutes A&B.A is soluble in hexane and B is not.Hexane is liquid at room temperature and does not mix with water.The density of hexane at room temperature is 0.7g/dm3.Describe givig full practical details how you would produce a pure sample of ...

science
An aqueo solution contains 2 solutes A&B.A is soluble in hexane and B is not.Hexane is liquid at room temperature and does not mix with water.The density of hexane at room temperature is 0.7g/dm3.Describe givig full practical details how you would produce a pure sample of ...

science
A sample of sucrose as been contaminated with sand.How would you purify the sucrose

chemistry
describe how you would produce pure samples of iron and sulphur powders from a mixture of the two.

Physics
A rollercoaster car starts at rest on top of a frictionless hill of height 17 m, slides down to ground level, and then into a frictionless loop of radius 5 m. When the car is at the side of the loop (level with the center), find the magnitude of the car's tangential ...

Algebra
Whoops and one thing I forgot. Is it allowed for a parobala to open upward and have the directrix intercept it? Since p is greater than zero, it would have to open upward, but then the directrix would intercept the parobala (the directrix follows the x axis, and is at zero y)

Algebra
Thanks to those who helped with my question: y+3=-1/12(x-1)^2. The only thing I am still unsure of is how to write the equation for the directrix. Do I just simply write 0=3-3, (the values plugged in for y=k-p). Thanks again for your help!!

Algebra
My standard-form equation is (x+3)^2+(y+2)^2=4. Do I find the radius by doing the square root of four? I just wanted to check on this. Based on the example in my book, it seemed like this is the way to do this, but I wanted to make sure, because they didn't come right out ...

Algebra
(I posted this yesterday, if it looks familar, but no one was on who could help me). I am supposed to graph y+3=-1/12(x-1)^2. How do I find the equation of the directrix, and the coordinates of the vertex and the focus?

Algebra
Hi again. I am supposed to graph y+3=-1/12(x-1)^2. How do I find the equation of the directrix, and the coordinates of the vertex and the focus?

Algebra
I am supposed to write the standard equation of the parabola with the directrix x=1, and the vertex 6,2. I got y-6=1/4p(x-2)^2. Is this correct? I am supposed to graph y+3=-1/12(x-1)^2. I tried to find p, and I got 36. I don't think this could be correct, because the graph...

english
are the following command sentences get into the car sit down and read your book

Algebra
what is the equation of the line that passes though the points (-3,4) and (-9,6)

Biology
I'm sorry, I don't think that's the answer. I believe it's only one word, and it's one of the organelles in the cell. Thank you for answering, but is there any one word organelle that you think might be the answer?

Biology
Thank you. This was very helpful.

Biology
I am doing an essay about the nuclear envelope. However, I can't find very good information about the function of this organelle. For example, how does the nuclear envelope protect the nucleus?

math
how would you make an equation for a decreasing linear relation?

biology
Indentify what category (protein, carbohydrate, or lipid) each of the following is: hemoglobin, ligaments, RNA, DNA, muscle fibers, cholesterol I thought RNA and DNA were nuecleotides.. but who knows? Thanks in advance. If those are the only 3 possible answers, then your ...

speed of light