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Posts by Jenna

Total # Posts: 659

physics
A person standing on a vertical cliff a height h above the lake wants to jump into the lake but notices a rock just at the surface level with its furthest edge a distance s from the shore .The person realizes that with a running start it will be possible to just clear the rock...

Chemistry
The oxidation of iodide ions by arsenic acid in acidic aqueous solution occurs according to the net reaction H3AsO4 + 3I – + 2 H3O +? H3AsO3 + I3– + H2O. The experimental rate law for this reaction is Rate = k [H3AsO4] [I–] [H3O+]. According to the rate law for ...

History
What does the phrase "without transcending its authority" suggest about Jackson? Jackson is concerned about abusing the power he has been given. Jackson wants to unite the states but does not have enough control of Congress. Jackson feels the Congress has too much ...

statistics
The Information Systems Audit and Control Association surveyed office workers to learn about the anticipated usage of office computers for personal holiday shopping. Assume that the number of hours a worker spends doing holiday shopping on an office computer follows an ...

History
What union is it ? This union accepted skilled as well as unskilled workers, blacks as well as whites, and men as well as women. As a result, its membership grew quite rapidly.

math
The number of immigrants living in a certain country with a large population makes up 35% of the population. In a random sample poll of 40 people what is: a)the expected number of non-immigrants will be polled? b)the probability that no immigrants will be polled? c)the ...

math
Thanks. However, I've found z-score value and it's greater than 3. z=(89.5-54)/6.57=5.4 If I can't find the value in the Z table, how I'm supposed to find the area value? I know I'm supposed to subtract the area value from 1 to find the probability for x>...

math
It is known that approximately 20% of the population is colour blind. In a sample of 270 people, use the normal approximation to find probability that: a)at least 90 people are colour blind b)exactly 50 people are colour blind I already posted this question and my solution. ...

math
Thank you very much.

math
In the spring, a group of biologists caught and tagged 500 wolves in a wilderness area. These animals were then released. A couple of months later, 200 wolves were caught and 75 of them had tags. Estimate the wolf population in this wilderness area. Please check if my solution...

data management gr.12
In the spring, a group of biologists caught and tagged 500 wolves in a wilderness area. These animals were then released. A couple of months later, 200 wolves were caught and 75 of them had tags. Estimate the wolf population in this wilderness area. Please check if my solution...

data management gr.12
I'm really confused now. Can you please explain where I've double counted? Thanks in advance.

data management gr.12
In a bag there are 8 red jelly beans and 7 green jelly beans. The 4 jelly beans are randomly chosen from the bag without replacement. a)create a probability distribution table for choosing red jelly beans b)what is the probability that at least 2 chosen jelly beans are green ...

data management gr.12
Thanks. My solution is: n=270 p=0.2 np=54 np(1-p)=43.2 sqrt(np(1-p))=sgrt43.2=6.57 z=90-54/6.57=5.479 I don't know how to find the probability that at least 90 people are colour blind, and probability that exactly 50 people are colour blind. P[x>90] P[x=50] Thanks.

data management gr.12
It is known that approximately 20% of the population is colour blind. In a sample of 270 people, use the normal approximation to find probability that: a)at least 90 people are colour blind b)exactly 50 people are colour blind Thanks

math
It is known that approximately 20% of the population is colour blind. In a sample of 270 people, use the normal approximation to find probability that: a)at least 90 people are colour blind b)exactly 50 people are colour blind Thanks

math
In a bag there are 8 red jelly beans and 7 green jelly beans. The 4 jelly beans are randomly chosen from the bag without replacement. a)create a probability distribution table for choosing red jelly beans b)what is the probability that at least 2 chosen jelly beans are green ...

math
A game is defined by the rules that two dice are rolled and the  player wins varying amounts depending on the sum of the two dice rolled based...

data management gr.12
There is a new water park in your neighbourhood. A rider is not allowed to get on the slide at the top until the previous rider has comletely exited at the bottom. It is known that the mean ride time for this type of slide is 24.5 s and the standard deviation of ride times is ...

data management gr.12
Tests show that the pressure, in pounds per square inch (Psi) required to break skate boards is normally distributed with a mean of 54.7 and standard deviation of 6.2 a)what is the probability that a board will require at least a pressure of 70 to break? b)64% of skateboards ...

data management gr.12
In a bag there are 8 red jelly beans and 7 green jelly beans. The 4 jelly beans are randomly chosen from the bag without replacement. a)create a probability distribution table for choosing red jelly beans b)what is the probability that at least 2 chosen jelly beans are green ...

Math
From the roof of a building, the angle of elevation of the top of a taller building is 37 degrees. The angle of depression of the base of the building is 28 degrees. The buildings are 21 m a part. Determine the height of the taller building

university physics
two suitcases are on a 7.89 m high ramp to passengers waiting in a baggage terminal. The top suitcase is released from rest, and it slides down the ramp and hits the second suitcase. If the suitcase at the top has a mass of 16.6 kg and the other suitcase has a mass of 33.2 kg...

Physical chemistry
Find ?G and ?A for the freezing of 1.00 mol of H20 at 0°c and 1atm. At 0 ° C and 1 atm the density of ice and liquid water are 0.917 g / mL and 1 g / mL, respectively.

Math
51

Fractions
how many pizzas are required if mario eats 1/3 of a pizza, Luigi eats 3/5 of a pizza, and Bruno eats 1 1/4?

Calc
Use the limit process to find the area of the region between the graph of the function and the x-axis over the given interval. y = −4x + 6, [0, 1]

math
A manufacturer of calculators would like to separate defective calculators from calculators that are acceptable. Through an error, a shipment of 12 calculators is sent out containing 3 defective calculators and 9 working calculators. A customer buys 5 of these calculators ...

Spanish
Grammatically correct? Mi hermana es muy trabajadora? Correct <--- Incorrect Tengo un perro que esta muy tonto, siempre se quiere morder la cola. Correct Incorrect<--- Yo no estoy honesto: Correct Incorrect<----

math
Six people are asked to pick a number from 1 to 20. What is the probability that at least two people will pick the same number? Please help. Thanks

Calc
You plan to paint a sphere of radius 200 cm with a coat of pain .2 cm thick. Use differentials to approximate the amount of paint that is needed. Use the equation for the volume of a sphere.

Calc
Use differentials to approximate the value of the 4th root of 82 How do I even start?

math
How many paths spell STATISTICS using Pascal's triangle? S T T A A A T T T T I I I S S T I I C C C S S Thanks in advance

Math
Where do I insert the grouping symbols for 8+12+16÷4 = 15

English
We have covered short stories: Killings, The Destructors, The Step Not Taken, Identities, Story of an Hour and the movie, V for Vendetta. Question: In the literature we've covered, WHEN is more important than WHERE. Attack or defend this claim. Please help. Thanks in advance.

English
We have covered short stories: Killings, The Destructors, The Step Not Taken, Identities, Story of an Hour and the movie, V for Vendetta.

English
In the literature we've covered, WHEN is more important than WHERE. Attack or defend this claim. Please help. Thanks in advance

math
What are the similarities between organized counting and permutation? Explain using examples. I can only think of one similarity: they both use probability problems using counting P(event)= Number of favourable outcomes/Total number of possible outcomes. Thanks for your help.

math
How many ways can 9 people be arranged to sit at a round table if Sam can not sit between Ron and Ed? My solution: 7! Thanks for your help.

Math
60 ft/s+ ?mi/min

Math
Write three fractions that can be written as percents between 50% and 75%. Justify your solution Can you please help me????

Physics: Oscillations and spring constant
A student measured 15s for the 20 complete oscillations for an object of 200g attached at the free end of a spring. Calculate the period of oscillation (T) and the spring constant (k). My work (just wanted to ask for opinions if this is right): T = 2π√(m/k) T = 20 ...

English
help I need a book report on Anastasia. It needs six sentences pls help.

chemistry
The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average molar mass of a nucleotide is 327 g/mol, what is the average molar mass of an entire DNA double ...

chemistry
The total mass of DNA in the body is 50.0 g. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average length of a single nucleotide is 0.34 nm, what is the length (in km) of one strand of DNA when it is stretched out to its maximum length (...

chemistry
If the average volume of all the blood in a human body is 4700 mL, what is the molarity of DNA in the human blood system?

chemistry
The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average molar mass of a nucleotide is 327 g/mol, what is the average molar mass of an entire DNA double ...

Math
hello, I'm trying to find the derivative of: y= 1+cos (x) / sin (x) thank you! :)

Calculus
Approximate the change in the lateral surface area(excluding the area of the base) of a right circular cone fixed height of h = 6m when its radius decreases from r=9m to r=8.9m (S=(pi)r sqrt(r^2+h^2)).

chemistry
A hot air balloon is filled with hot air and the hot air forces the volume of the balloon to expand until the density of the gas in the balloon is less than the density of the outside air. The volume must be 20% larger than the balloon would be at STP in order for the balloon ...

chemistry
A 100.0 mL sample of 0.300 M Ca(OH)2 is mixed with 100.0 mL of 0.700 M H3PO4 in a coffee cup calorimeter.If both solutions were initially at 35.0 °C and the resulting solution had a temperature that was recorded at 39. 7°C, determine the ΔHrxn in units of kJ/mol...

Math- I'd really appreciate it if you could help!!
Point $G$ is the midpoint of median $\overline{XM}$ of $\triangle XYZ$. Point $H$ is the midpoint of $\overline{XY}$, and point $T$ is the intersection of $\overline{HM}$ and $\overline{YG}$. Find the area of $\triangle MTG$ if $[XYZ] =150$.

Chemistry
How do you find the mass of iron in audio tapes per metre of tape?

civics
I would be able to check answers for you, but you have to fill out the blanks yourself.

college pre calculus
A kite frame is to be made from 6 pieces of wood. The four border pieces have been cut 5 and 12. The long center piece is 13. what should the length of the cross pieces be in order to maximize the area of the kite.

Math
To the nearest tenth, find the volume of a sphere with a diameter of 10 cm. Use 3.14 for Pi

Math
Solve the following equation with complex numbers and the quadratic formula : 7x^2-4x+2=0 My answer is 4+- 2i√10 ________ 14 My only question is Can this be reduced ?

Math
What is the smallest whole number divisible by both 17 and 8?

6th grade math
$3.05

Math
(8-x)/2=x-2 Solve for x I tried this equation and I cannot get the answer at all

Math (calculus )
I thought in the equation we would plug in what we know and then solve for t?

Math (calculus )
So would I be correct? v(t) =5200-t([5200-1100]/8)

Math (calculus )
Yes that is what I meant to type

Math (calculus )
A company buys an office machine for $5200 on January 1 of a given year. the machine is expected to last for eight years at the end of which time its trade in value or salvage value will be 1100$. if the company figures the decline in value to be the same each year than the ...

Math
A company buys an office machine for $5200 on January 1 of a given year. the machine is expected to last for eight years at the end of which time its trade in value or salvage value will be 1100$. if the company figures the decline in value to be the same each year than the ...

pre-calc college
a certain type of fencing comes in rigid 10 foot long sections. Four uncut segments are to be used to fence in a garden on the side of a building. what value of x will make the garden as large as possible?

Math
How do I work this out: beth took a math test and scored a 75. She took another math test and scored 20% higher. Whatis her scorefor the second test?

Math
Thanks so much :)

Math
The finale score In a soccer game is 4-3. How many different scores were possible at half time?

algebra
Sara goes on a slingshot ride in an amusement park. She is strapped into a spherical ball that has a radius of centimeters. What is the volume of air in the spherical ball?

Sign Language.
What is an adjective? A) a descriptive word used to modify a noun or pronoun B) a person, place or thing C) an action word D) all of the above

Sign Language??
I'm not sure on #1 and on #3. #2 is A. #4 is False.

physics
A fly of mass .2 g sits 12 cm from the center of a phonograph record revolving 331.3 rpm. a)What is the magnitude of the centripetal force on the fly?b)What is the minimum value of the coefficient of static friction between the fly and the record required to prevent the fly ...

Chemistry
Was it right?

science
A body has been found in a home with the thermostat set at 70 degrees Fahrenheit. The medical examiner measured the core body temperature to be 90.5 degrees. calculate the approximate time of death

Business Consulting, Intro to Computers
• Bill wants the entry in Column G to remind him of expenses that require receipts for the accountant. Tell Bill what to put in Column G to do this: a. Print the word “Yes” in any row where the total daily expenses are greater than or equal to $100.00. b. If the...

Physics/trig
A fire hose ejects a stream of water at an angle of 33.6 ° above the horizontal. The water leaves the nozzle with a speed of 29.6 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?

math
7.88

Physical Science
It would have to use the equation Q=mTCP

Bio
A field mouse eats 10000 g of leaves each year, among other things. Of each gram of leaves has absorbed 150 kj of energy from the sun, about how much energy is available for the mouse?

chemistry
MasteringChemistry said the correct answer is 4.26×10^4 g

Physics/trig
During takeoff, an airplane climbs with a speed of 300 m/s at an angle of 36 degrees above the horizontal. The speed and direction of the airplane constitute a vector quantity known as the velocity. The sun is shining directly overhead. How fast is the shadow of the plane ...

Physics PLEASE HELP!
A bullet whose mass is 1.0 x 10-3 kg leaves a 5.0 kg rifle with a muzzle velocity of 1.0 x 103 m/s. It strikes a stationary block of wood whose mass is 1.0 kg and remains embedded in it. The kinetic energy of the bullet as it travels towards the wooden block is?

Physics
A 1386 kg car traveling at 61 km/h is brought to a stop while skidding 42 m. What is the work done on the car by the frictional forces? (Use formula: v2 = vo2 + 2ad)

Physics
What is the change in velocity (in m/s) if an impulse of 225 N acts on a 4.5 kg mass for 3.0 s?

Physics
A force of 12.0 N acts for 3.7 s on mass M. What impulse (in N*s) is given to the mass?

Physics
A 50.0 g bullet strikes a 7.00 kg stationary wooden block. If the bullet becomes embedded in the block, and the block with the embedded bullet moves off at a velocity of 5.00 m/s, what was the initial velocity of the bullet?

Scrambled Paragraph
I wanted to see if I got it right or wrong.

Scrambled Paragraph
Ugh! That means I failed the test! 😢

Scrambled Paragraph
Architects must consider many factors in designing a building. _1_ Q. Lighting is an essential aesthetic consideration in the design of a building's interior. _4_ R. It's source of daylight, high overhead and filtered through stained glass, creates exciting patterns of...

Logical Reasoning
During the spring, Jim mows his lawn twice per week. During the summer, Jim mows his lawn once per week. A) Jim's lawn grows faster in the summer than in the spring. B) Jim bought a new lawn mower just before summer. C) it is important to Jim to keep his lawn trimmed. D) ...

Logical reasoning
On her way to work today, Wendy paid one dollar more to fill her car's gas tank than she paid one week ago to fill the same tank. A) Wendy's car is leaking gasoline. B) The price of gasoline has gone down. C) Wendy needs her car for transportation. D) Wendy took a trip...

Logical Reasoning
Yea A is supposed to say Rick Spencer is the star of the movie.

Logical Reasoning
A new movie now playing in theaters is based on an old television series. Rick Spencer appears in the movie but did not appear in the television show. A) Rick Spencer is the date of the movie. B) The television show is popular today. C) The television show was cancelled. D) ...

Logical Reasoning
Is it D?

Logical Reasoning
No house lights on this side of the street is on. At every house across the street, at least one light is on. A) Residents on this side of the street are trying to save energy. B) Residents across the street have not turned off their lights. C) It is the middle of the night. D...

Math
There is a right triangle named ABC. If AB=2 yards and BC=6 yards, what is the perimeter of triangle ABC? A) 4*square root of 2 yards B) 8 yards C) 8 + 2*square root of 10 D) 8 + 2*square root of 14 E) 28 yards

Math
What is the fewest number of 7's that can be added together to make their sum greater than 4000? A) 4001 B) 572 C) 571 D) 470

Math
In triangle ABC, the measure of angle A is 80 degrees and the measure of angle B is 50 degrees. If the length of AB is 2x - 12 and the length of AC is x - 3, what is the length of AB? A) 15 B) 12 C) 9 D) 6 E) 3

Vocabulary
"Higher forms of animal life have a variety of systems within their bodies that are used for special functions: a circulatory system for he blood; the food supplier; a digestive system for converting food into energy and body tissue; and others. The definition that ...

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