# Posts by Jack

Total # Posts: 1,848

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.

physics
A stone is dropped from a 100m bridge. How long does it take the rock to reach the ground?

Physics
Two blocks, each of mass m = 3.35 kg are hung from the ceiling of an elevator as in the figure below. (a) If the elevator moves with an upward acceleration a with arrow of magnitude 1.7 m/s2, find the tensions T1 and T2 in the upper and lower strings. T1 = N T2 = N (b) If the ...

Physics
An object of mass m1 = 4.10 kg placed on a frictionless, horizontal table is connected to a string that passes over a pulley and then is fastened to a hanging object of mass m2 = 6.70 kg as shown in the figure -> Find the magnitude of the acceleration of the objects. (m/s2...

Physics
A block slides down a frictionless plane having an inclination of θ = 13.2°. The block starts from rest at the top, and the length of the incline is 1.70 m. -> Find the acceleration of the block. (m/s2 down the incline) -> Find its speed when it reaches the ...

Physics
An electron of mass 9.11 10-31 kg has an initial speed of 2.60 105 m/s. It travels in a straight line, and its speed increases to 6.00 105 m/s in a distance of 4.40 cm. Assume its acceleration is constant. (a) Determine the magnitude of the force exerted on the electron. ...N...

science
I'dTellYouButThenI'dHaveToKillYou is 100%

social studies
which four state capitals are located between 60 west and 70 west longitude

history
Which of the following is one of the notable achievements of early China?

algebra
A train leaves the station at noon.The train is 180 miles from its destination at 12:45pm,and 90 miles from its destination at 2:15p.m..At what time will the train reach the destination?

science
Draw and label a diagram of a nitrogen atom. It should have 7 protons,7 neutrons, and 7 electrons

algebra
What is the equation for the line with a slope of 7 and a y-intercept of -1 ?

algebra
What is the equation in slope-intercept form of the line that passes through (1,5)and has a slope of 3 ?

social studies
what were the guaranteed jamestown success

Physics
A bean jumps vertically off of a table. It has a speed of 10 m/s when it reaches half of its maximum height. How high does it rise?

Physics
A bean jumps off a table and when it reaches have its height it has a speed of 10 m/s, how high does it rise?

language arts
in which sentence is the word immensely used correctly

English
Why should you help old people across the street?

Tax
What item should not be included in income?

Math
A cashier has a total of 33 bills consisting of ones, fives and twenties. The number of twenties is 14 less than the number of ones. The total value of money is \$164. How many of each denomination of bill are there?

Math
8 guppies

chemistry
12M HCl + H20→ 5M HCl How much water? Total Volume= Pls I need this tomorrow

art
Yep I actually got an A%

Math
List the factors. Is this a prom or composite

Math
There are 12 animals in a farm.some are cows the rest are chickens.there are 28 animals legs in all.how many cows are there? how many chickens are there ?

English
i thought it was a name of grass so it should be capitalized ?

English
like lets say ur hiding in it. My mom was hiding in the High Grass?

English
Is High Grass capitalized?

History
thank you

History
did Amerigo Vespucci discovered the new world before columbus?

English
do you write annotations in appendix in a book?

Algebra
Are functions have one x and one y?

English
5-10

English
Annotating a book. How many literary devices should you list down?

History
I watched the movie The crucible 1996, can you give me any tips on how to write a synopsis?

English
If you had a book to annotate would you do it on the book or on paper?

Pricing Number
What does it mean if there is a comma in a number like this? \$1,02

English
thank you

English
Is agony, and dumfounded tone words?

Math
The value of 50! Is the product of all the whole numbers from 1 to 50 inclusive, i.e. 50! = 1x2x3x...x49x50. Find the maximum number of divisions by 2.

English
What is Author's Word Choice?

algebra
thanks damon

algebra
if the x is on the numerator on the equation. is the equation linear?