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Posts by JACK

Total # Posts: 1,788

Biology
Explain why oxygen consumption varies with body weight.?

Biology
The rate of oxygen uptake by gills depends on the surface area, the number, and the thickness of the lamellae across which oxygen must diffuse. What are two ways to increase the rate of oxygen uptake?

Biology
what is the direction of blood flow in relation to the direction of water flow over the gills

Biology
only 2 percent of the oxygen intake in humans is used by respiratory muscles. do you think the percent of oxygen used by respiratory muscles in a fish is higher or lower than this

World War
What commitments did Canada make as a member of NATO? How did membership in NATO affect Canada's foreign policy?

post world war
what is nato why was it formed what did prime minister mean when he said it is vital to the defense of freedom, to ,maintain military strength on the side of freedom

binomial distribution
Assume that a procedure yields a binomial distribution with a trial repeated n=5n=5 times. Use some form of technology to find the probability distribution given the probability p=0.687 of success on a single trial.

math
Juan is cutting lumber into one half foot lenths.How many one half foot lengths will he get from an 8 foot long piece of lumber?

Social studies
Important animal reasource of great plain Indians

math
A photograph shows 6 foot tall Mr. Jackson standing next to a building. in the photo Mr .Jackson is 2.5 centimeters tall and the building is 10 centimeters tall. what is the actual height of the building

ASL
i dont remember

Physics
Circuit I-----R-------I I-I--I-----R----I---I-----I I I-------R------I I I I I--------/ I--------------I E=15v All R= 7ohom What is the equivalent resistant of the circuit?

Math (Physics)
What is the resistance of a 3.9-m length of copper wire 1.1 mm in diameter? The resistivity of copper is 1.68×10^?8??m. R=______ ? Please Help. I've been at this for hours.

Math(Physics)
How much energy is stored by the electric field between two square plates, 7.9 cm on a side, separated by a 2.5-mm air gap? The charges on the plates are equal and opposite and of magnitude 15 nC . Answer--> PE=_____ J PE = potential energy? I got this wrong twice. [119805....

math
Mr. Gaines is catering his company picnic. He will pay $18.45 for 3 people to eat the barbecue lunch. At this rate, how many people can Mr. Gaines afford to feed on a budget of $195.00?

Maths
A square based pyramid, with a perpendicular height of 15cm I'd placed on a table. The weight of the pyramid is 70.56N. The pyramid exerts a pressure of 4900N/m^2 on the table. Work out the volume of the square based pyramid. Thank you so much.

math
The other question is: Consider the points A(1,0,0), B(2,2,2), and C(0,2,1). 1) Show that the Cartesian equation of the plane II(1) containing the triangle ABC is 2x+3y-4z=2. 2) A second plane II(2) is defined by the Cartesian equation II(2): 4x-y-z=4. Find the vector equation...

math
Hi, I was working on my math homework and I was stumbling on these problems. I tried looking at the solutions but my answers were completely off. Here are the ones I'm stuck on: If vectors O(0,0,0), A(6,0,0), B(6,-sqrt(24), sqrt(12)), and C(0,-sqrt(24), sqrt(12)) form a ...

Social Studies
Thank You!

Social Studies
How did Americans disagree over the role of federal and state governments before and during the Civil War? The North wanted the federal government to govern the entire country. The South wanted the states to have much more power. Anything else I could add and am I on track?

Math
i need this answer A.S.A.P what is the volume of pyramid C if the volume of pyramid D is 4608 m cubed and the height of pyramid D is 24 and the height of pyramid C is 12

Math intermediate algebra
The perimeter of a triangle is 33 inches. The sum of the length of the longest side and twice the length of the shortest side is 31 inches. Twice the length of the longest side minus the sum of the lengths of the other sides is 12 inches. Find the lengths of all sides. How do...

Maths
S + C + H = 100 40S +65C + 2H = 3279 How do you solve these type of equations. I'm so confused!

This isn't about school
Hey Ms. Sue I feel ya, lots of cheaters on this website I understand, but sadly you can't do anything because from the beginning of time people always find a way to cheat the system and find loop-holes.

math question
A cliff swallow nest is 86 meters above a canyon floor. The elevation of the nest is ?56 meters. What is the elevation of the canyon floor?

math
A rectangular closet is three feet longer than twice the width. The area of the closet is 65 square feet. Find the perimeter of the closet.

ELA
In "How Beaver Stole," what changes to the land does Beaver cause when he runs away with fire?

Math Algebra
@steve what question r u talking about

Math Algebra
hi guys need help with a few questions. 1. Which equation represents the axis of symmetry of the function y = 2x^2+4x-6? A. y= 1 B. x= 1 C. x=3 D x= -3 2. & 3. What are the coordinates of the vertex of the graph of the function - 2. y = -x^2+6x-11 A. (3,-2) B. (3,16) C. (-3,-...

Math
find the measure of the x in the triangle. the other two points are 65 degrees.

chemistry
At 983 torr of pressure, 1.62 grams of a gas dissolves in 2.0L of water at 10'C. What mass of gas will dissolved in 2.0L of water at 1432 torr and 10'C

Statistics
A manufacturer estimates that when x units of a particular commodity are produced each month, the total cost (in dollars) will be C(x) = 1/8x^2+4x+200 and all units can be sold at a price of p(x) = 49 - x dollars per unit. Determine the price that corresponds to the maximum ...

Language Arts
Who has the answer for the whole test

Physics
When a mass is hung from a spring stretches it by 15 cm. What is the period of the oscillations of this system?

Physics
A wheel has a radius of 100 cm. How far (path length) in meters does a point on the circumference travel if the wheel is rotated through angles of (a) 30°, (b) 60 rad, (c) 60 rev, respectively?

Math
Since there are eight students, they can only each get 1/8 of the cake. However, since there is only 3/4 of the cake left, you just multiply the numbers. (1/8)(3/4) = 3/32

Physics
Sarah walks 5 miles 35 degrees north of east, and then decides to walk 6 miles due west. What is her final displacement? I drew it out, used the Pythagorean theorem and ended up with square root -11 which is obviously wrong. I'm really confused as to what to do with the ...

Math
(i) Evaluate integral [ x^3 / (x^2 + 4)^2 ] using trigonometric substitution. (ii) Evaluate integral [ x^3 / (x^2 + 4)^2 ] using regular substitution. (iii) Use a right triangle to check that indeed both answers you obtained in parts (i) and (ii) are the same. I would really ...

Math
Charles is going camping with hisis family. Their campsite is five eighths 5 8 mile away. They walk at a steady speed of 1 and one fourth1 1 4 mi divided by hmi/h. How many minutes will it take them to get to the? campsite?

Physics
Two blocks,each of mass 3.0 kg are connected by a light cord and placed on a horizontal surfabe when a horizontal force of 20 newton is applied on a block an accn of 0.50 metre per second square is produced find(a)tensiom(b)force of friction which is same

Math
In the midsize Station wagon category, the Mercedes Benz E63 AMG S 4matix averages 15.63 L/100km while the Toyota Prius v averages 6.71 L/100km. Convert these fuel economies to miles per gallon.

Physics
A constant 5 N horizontal force hits a stationary 2 kg ball. What is the balls speed after going 10 m?

algebra
Simplify using long division.Show all work. (-72-4x^2+8x^3-36x)/(x-3) Also,please solve (8b^3-6)/(2b-1) I greatly appreciate your help.

Chemistry VERY DIFFICULT
Imagine you have been given a series of materials to react together and the following enthalpy change data has been recorded. Explain the terms exothermic and endothermic, and identify which of the following are exothermic and endothermic reactions. Ensure that you explain ...

algebra
I'm sorry about the carelessness of my first question. The correction should read: y=x^2-4x -32.Use this function to find the x-intercepts by factoring;then show how the value of the discriminant supports your conclusion(s). I'll try to be more careful

algebra
y=x^2 -4x-32. Use this function to describe how the axis of symmetry relates to the x-intercepts. Thanks for your help and time.

algebra
Use this function and find the x-intercepts by factoring; then show how the value of the discriminant supports your conclusion(s). Thank you for all your help.

algebra
Can someone show me the complete solution to this word problem? William,a logistician,needs to route a freight train that is 20 feet at its tallest point and 10 feet at its widest point within 3 days. the most direct path includes a single-track tunnel that needs 24 hour ...

Physics
A piece of metal of volume 250 cetimetre cube floats in water when 85 percent of it's volume is under water.Calculate the upthrust on the metal. 250*85=21250

algebra
Use square roots to solve these equations. Round to the nearest hundredth if necessary. 5x^2 + 536 = 651. Also,problem 2: 3z^2 + 52 = -56

math
Jack has 5 more apples than Jill. Jill has 3 apples. How many apples in total do they have?

Marh
A football team has a net yardage of-26 1/3 yards on a series of plays. The team needs a net yardage of 10 yards to get a first down. How many yards do they have to get on their next play to get a first down?

algebra
How do I completely factor the following expression: w^2 -15 + 54 Thank you.

algebra
Using factoring and zero-product property,please solve the following: 9r^2 -30r +21=-4 Thanks very much.

algebra
Using factoring and zero-product property solve: 4a^2 -10a +6=0 Thank's a lot.

algebra
Please show solution to simplifying this expression: ( 5z-2 )( 5z+2) Thank you.

algebra
How do I simplify (2m-4)(m^2+2m+4)? I appreciate your help,thank you.

algebra
Please simplify the following expressions: (p^2+4p-23)-(3p^2-23p-23) (5z-2)(5z+2) (2m-4)(m^2+2m+4) Thank you for your much appreciated help.

algebra
Using factoring and the zero-product property,please show how to solve the following problem: z(z-1)(z+3)=0 Thank you for your help.

algebra
Please describe and correct the error. (3x-2(2x-3)= 3x(2x-3)-2(2x-3)=6x^2-9x-4x-6=6x^2-13x-6 Thank you for your help.

algebra
Please simplify the following expressions: (x^2+3x-9)+(-4x^2+2x-3) (x-2)(3x+5) (r+3)^2 Thank you for your help.

algebra
Would you please simplify the following problems: (4t)^2t^0/t^6v-8 p^-3/p^-2r^3 Thank you for your help.

algebra
Please show me how to simplify these expressions:1) (-x)^2(-x)^5 2) (-3m^3)^2 3) (x/y)^-3 Thanks very much for your consideration.

algebra
Am I allowed to post 3 related questions? I'll try. Please write these scientific notation answers in standard form showing complete work. 1.764*10^8 3.90625*10^-7 3.0*10^3 Thank you.

algebra
I still need help! Please show a complete evaluation with the answer in scientific notation. 9.6*10^2/3.2*10^5 Thanks very much.

algebra
Please evaluate this expression with the answer in scientific notation. (2.5*10^-2)^4 I certainly would appreciate help.Thank you.

algebra
Please evaluate the expression and show the answer in scientific notation. (4.2*10^2)(4.2*10^5) Thank you

algebra
Please show the following numbers in standard form. 6.548*10^-3 5.854*10^1 2.25*10^6 Thank you for your help.

Math
Is it reasonable or not give me an anwser

algebra
Please show me how to put this number in scientific notation. 3.000052 Thank you.I appreciate your help.

algebra
Please show this number in scientific notation. .00000698 Thank you.

algebra
Will you show me how to put this number in scientific notation. 5,100,000 Thank you.

Math equation
Total games played = 556+4+228 = 788 Win percentage = (556/788)*100 = 70.6%

math
If 3/5 are girls, 2/5 are boys. Let x represent the total no of students. Thus, (2/5)x = 200 x = 500 There are 300 girls and 200 boys, so the total number of students is 500.

Math
For simplicity, let us convert everything to SI units. 1 inch = 0.0254 m 12 foot = 3.6567 m 24 foot = 7.3152 m 1 gallon = 0.00378541 m^3 Thus, volume is 0.0254m*3.6567m*7.3152m = 0.6794370927 m^3 Determining how many gallons of water are required to raise water level, 0....

Math
breadth = (20-(6*2))/2 = 4 cm

Math
Essentially, e^(i?) = cos? + isin? Euler's formula provides a way to relate trigonometry to the complex identity, i, which is the square root of negative one.

Science
False. To become more stable, an atom that has two electrons in its outer energy level will give away two electrons.

Physics - studying for finals
(a) Write the expression for y as a function of x and t in SI units for a sinusoidal wave traveling along a rope in the negative x direction with the following characteristics: A = 5.00 cm, ? = 75.0 cm, f = 5.00 Hz, and y(0, t) = 0 at t = 0. (Use the following as necessary: x ...

Physics - studying for finals
(a) Write the expression for y as a function of x and t in SI units for a sinusoidal wave traveling along a rope in the negative x direction with the following characteristics: A = 5.00 cm, ? = 75.0 cm, f = 5.00 Hz, and y(0, t) = 0 at t = 0. (Use the following as necessary: x ...

Engineering science
As we have an ideal gas, we can assume that (P/T)initial = (P/T)final First, we must convert temperatures in Celsius to Kelvin. 27ºC = (27 + 273.15)K = 300.15K 79ºC = (79+273.15)K = 352.15K Let x represent (T)final 300.15 K ÷ 140,000 Pa = 352.15K ÷ x...

Physics
An ore car of mass 44000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 26 m lower vertically, is a horizontally situated spring with constant 4.5 × 105 N/m. The acceleration of gravity is 9.8 m/s 2 . Ignore friction. How much is ...

Physics
A 0.1134kg spherical meteor of diameter 3 cm enters the earth’s atmosphere at an elevation of 121920m with a velocity of 13411.2 m/s. The meteor’s temperature is -73.15?C. The specific heat at constant volume (Cv) of the meteor is 800 J/kg?C. (a) If the meteor has a ...

Maths
30

physics
A steel spring is hung vertically. Using a ruler, the lower end of the spring was measured to be 25.0cm from its upper end. However, when an object of mass 0.500kg it attached to the lower end of the spring the spring stretches to a new length of 45.0cm. With the aid of a ...

physics
A steel spring is hung vertically. Using a ruler, the lower end of the spring was measured to be 25.0cm from its upper end. However, when an object of mass 0.500kg it attached to the lower end of the spring the spring stretches to a new length of 45.0cm. With the aid of a ...

Math
Don't know

Physics
A quarterback throws a spiral to a receiver that is 40m away. The football has a spin of 14 rev/s and went through 58 revolutions before being caught. if the ball is caught at the same height it was thrown at, at what velocity and at what angle should the quarterback throw the...

Maths
Harry makes up a sequence. The first number is 6 and each number after that is 3 more than twice the previous number. What will the fourth number be in the sequence?

Maths
write down a number whose values lie between 5.4 and 5.5

Math
How many pieces 9 in long can be cut from a 15 ft.piece of wood

Math
A shopkeeper buys a table at ?300 and sells it for Rs.375.Find his loss or gain percentage.

English
i moved to the united states when i was young.As my parents already knew english it was easy for me to learn.

Physics
When the Sun is directly overhead, a hawk dives toward the ground at a speed of 6.09 m/s. If the direction of his motion is at an angle of 78.6 â—¦ below the horizontal, calculate the speed of his shadow along the ground. Answer in units of m/s

Math Help!
you bring -9 to the other side so it'll be 9+9/10. make common denominator and solve it. then divide -2/5 by the answer of the above. so you will have x is < answer you'll get

Math
A rectangular school banner has a length of 36 inches and a width of 52 inches. A sign is made that is similar to the school banner and has a length of 22 inches. What is the ratio of the area of the school banner to the area of the sign? What is the ratio of the areas? I ...

Physics
A ball of mass m 0.285 kg swings in a vertical circular path on a string L = 0.810 m long as in the figure below. a) If its speed is 5.25 m/s at the top of the circle, what is the tension in the string there? 6.89N (is the answer) b)If the string breaks when its tension ...

Physics
A 145-kg object and a 445-kg object are separated by 3.90 m. (a) Find the magnitude of the net gravitational force exerted by these objects on a 34.0-kg object placed midway between them. (N) (b) At what position (other than an infinitely remote one) can the 34.0-kg object be ...

Physics
A 2 stage rocket launches off at an initial angle of 75 degrees above the horizontal. The rocket has a mass of 250 kg, while the stage 1 has a mass of 125 kg, and the stage 2 booster has a mass of 50 kg. At ignition the stage 1 booster gives the rocket a thrust of 34,652 N for...

chemistry
Write the balanced chemical equation for the oxidation of catechol to quinone.

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