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Posts by JEFF

Total # Posts: 821

physics
a 600 kg hammer of pile driver is lifted 2 meters above a piling head. what is the change in potential energy if the hammer is released, what will its speed at the instant it strikes the piling?

Math
Fine the size of the following matrix and its additive inverse matrix. Identify if it is a square, column, or row matrix: [ 2 -3 7 1 0 4 ]

math
I think you would need one of the variables because all that is telling me is 180 = 1/2bh . Are there any other variables listed?

math
This is about direct variation. The area a painter can paint varies directly with the amount of time he works. One morninig, he painted 204 ft² between 8 a.m. and 12:15 PM. Write a direct variation equation to describe the area y covered in x hours. The forumlua for ...

Trig
Simplify: (cosx + cos2x + cos3x + cos4x + cos5x + cos6x) / (sinx + sin2x + sin3x + sin4x + sin5x + sin6x) into a single Cotangent function. Using the sum-to-products, I was able to get remove some of the addition in attempts to get full multiplication, but I could not get the ...

math
Find the maximum area of a rectangle inscribed between the x-axis and f(x)=-x^4+3

science
ice

science
jeff

Math
Find the periodic payment that will amount to the given sum under the given conditions: S=$150,000; interest is 6% compounded semiannually; payments are made at the end of each semiannual period for 11 years.

math
how would 3 neighbors divide a sharing a rectangle piece of land divide it into 24 equal pieces and what fraction of land would each get

chemistry
how many moles of sodium ions are present in 3.50 L of 0.400 M Na3PO4?

math
This pattern represents the SQUARE NUMBERS: 1,4,9,16,25,36...draw a picture or diagram to explain SQUARE NUMBERS.

science
How often do you water basil?

spanish
Help with spanish!!!! Have to put correct words in the banks. 2 of them will not be used.? Querida Beth: 1) (blank) esta todo bien y esperamos que 2) (blank) tambien lo este. 3) (blank) lo pensemos y lo conversemos, tu padre y yo no estamos contentos con tu viaje. 4) (blank) ...

Chemistry
When titrating an acid with a base, a dilute solution of the base is used. When titrating a base with an acid, a dilute solution of acid is used. Why are these titrations done with dilute solutions?

Chemistry
What volume of 0.5 N nitric acid would be required to completely neutralize 300 ml of 1.0 N sodium hydroxide?

Chemistry
If you had one gallon of concentrated hydrochloric acid (12 N) and added water to make dilute hydrochloric acid (6 N), how much dilute hydrochloric acid would you have?

physics
thank you !

chem
In the explosion of a hydrogen-filled balloon, 0.54 g of hydrogen reacted with 6.6 g of oxygen to form how many grams of water vapor?

marketing
Your team has been hired by ABC company’s senior management to conduct a research project. The company has 40 employees and has been in business for 25 years. The company offers sales & service on all sizes of new Xerox copiers. The company has been faced with decreasing ...

chemistry
Calculate the volume of 1.80 M \rm Na_3PO_4 in milliliters that contains 6.00 g of solute.

college- Physics
lulz

math figuire
Volts divided by the amount of resistance will give you the amps.

Biochem
The conc is 6.0M HCL

Physics
Two motorcycles are traveling due east with different velocities. However, 2.16 seconds later, they have the same velocity. During this 2.16-second interval, motorcycle A has an average acceleration of 1.30 m/s2 due east, while motorcycle B has an average acceleration of 19.4 ...

Pre Calc
From a committee of 6 people how many sub-committees of 3 can be formed, and with 7 people and with 8 people and with n people?

Pre Calc
How many triangle are determind by the vertices of a hexagon, heptagon, octagon, and n-gon?

Math
in salem, 42% of the registered voters are republicans and 44% are democrats. the other 217 are independents. how many registered voters are there in salem?

math
During a football game, two players try to tackle another play. One player applies a force of 50.0 N to the east. A second player applies a force of 120.0 N to the north. What is the total applied force? (Since force is a vector, you must give both the magnitude and direction...

Chemistry
A 4.50 g sample of LiCl at 250 C dissolves in 25.0 ml of water also at 25.0 C.? The final equilibrium temp of the resulting solution is 60.8 C. What is the enthalpy of solution, deltaHs, of LiCl expressed in kilojoules per mole.

6th grade math
Boy dis is 2 ez

CHEMISTRY
Explain why it is quantitatively not acceptable to titrate each of the vinegar samples with the NaOH titrant to the same dark pink endpoint?

algebra
The perimeter of a rectangle is 128m the length is 4m more than twice the width

12th grade maths
i deposit 1,000 for 4 years a rate 2% nthe compounded annually how much money after 4years

statistics
which of the following statements are correct? a. a normal distribuiton is any distribution that is not unusual. b. the graph of a normal distribution is bell-shaped. c. if a population has a normal distribution, the mean and the median are not equal. d. the graph of a normal ...

statistics
indicate whether the given statement could apply to a data set consisting of 1,000 vlaues that are all differnt. a. the 29th percentile is greater thatn the 30th percentile b. the median is greater thatn the first quartile c. the third quartile is greater than the first ...

12th grade
The area of a circle is 28.26 square centimeters. What is its diameter (use 3.14 for ð)?

physics
A big yo-yo(radius .2m, mass 20kg) has a string wrapped about its circumference. If yo-yo falls, how far does it fall in 2 seconds? (The yo-yo is shaped like a disk)

chemistry
100 million automobiles contains 1.1 kg of CFC-12 and leaks 25% of its CFC-12(CF2Cl2) into the atmosphere per year, how much Chlorine in kilograms is added to the atmosphere each year due to auto air conditioners?

economics
By 2008 the US trade deficit was still very large (roughly 5% of gross income) and our net debt position was around $5 trillion (over 1/3 of gross income). Unfortunately, it also appears that we have fallen into a major recession of uncertain duration and depth. Discuss the ...

Accounting
Imagine you have been selected by your manager to present a training session to a group of new employees. The new hires do not have accounting backgrounds and have little or no work history in a responsibility center. The purpose of this training session is to explain the ...

Physics
A hunter aims directly at a target (on the same level) 125m away. If the bullet leaves the gun at a speed of 227 m/s, by how much will it miss the target? I'm not sure how to approach this problem. I know I need to find the horizontal distance traveled, probably by finding...

Algebra 2
I meant to type this one: If the sine of an acute angle is 0.8, what is the sine of twice that angle? 1.60 or .64? Thanks

Algebra2
I got it, .5

Algebra2
Help How do I figure out: (cos 40)(cos20) - (sin 40)(Sin 20) Thank you

Right Hand Rule
a) west b) zero deflection c) up d) down

algebra 2
I am taking an online class, and cant understand why when I calculate ona ti84 plus an answer I get decimal answer and my teachers answer is sq root, is there something I am not doing on my calculator? How do I convert. Example, teachers answer to the following was sin 315deg...

algebra2
Example, teachers answer to the following was sin 315deg = -sin 45deg = -sqrt2/2 I got a decimal answer.

algebra2
I am taking an online class, and cant understand why when I calculate ona ti84 plus an answer I get decimal answer and my teachers answer is sq root, is there something I am not doing on my calculator? How do I convert.

Chemistry
902 mL

statistics
The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?

Science
what is the relative location of the marine biome, specifically the ice cap biome?

chemistry
6) How many grams of copper (II) fluoride, CuF2, are needed to make 6.7 liters of a 1.2 M solution?

calculus
sum_(n=-1)^infinity(-1)^(n+1) (1/3)^n = 9/4~~2.25... How do you find that out? Is there a formula?

chemistry
Write a net equation for the reaction between aqueous solutions of HBr and NH3.

Finance
7.90%

math
Evaluate f(x)= 4x^2 - 2 for f(1/2)

managerial economics
a) Given total cost function as C=160+16Q+0.1Q(2){squared} and price equation P=96-0.4Q. Total Revenue function is R=PQ=96Q-0.4Q(2). The profit function is F=R-C=(96Q-0.4Q(2))-(160+16Q+0.1Q(2))=80Q-0.5Q(2)-160. Profit attains maximum when and is negative dF/dQ=0 and d(2)F/dQ(2...

chemistry
How many grams of oxygen are required to react with 0.128 lead(II) sulfide?

algebra
x – 2y = 6

Chemistry
This question is: How many orbitals are there in each of the following energy levels.. a) 1s b) 6p c) 10f d) 7d e) 5s Now.. do i use n^2 for the number of orbitals in each energy level? Ex. b) would be 36 OR can i state the number of orbitals in each sublevel using the shape? ...

Chemistry
Why do atoms display spectra?

chemistry
how did you get that?

Calculus
An isosceles triangle has a vertex at the origin. Determine the area of the largest such triangle that is bound by the function x^2 + 6y = 48. So, y=8 when x=0 making a vertical side equal to 8. I also determined that there is a zero at =/- the square root of 48, or ...

Calculus
The radius of a tank can not exceed 5m, and the height can not exceed 12 m. Is it possible to construct a tank with a volume of 900m^3? If it is possible, determine the minimum amount of material required to make the tank. When i solve it, the radius exceeds the restrictions...

physics
Evidence suggests that there are trillions of dollars' worth of minerals and metals buried in Near Earth Asteroids (the ones that come close to the Earth, not the ones in the asteroid belt between Mars and Jupiter). Many scientists think an asteroid mining mission is ...

Chemistry
I've been asked to find the IUPAC name for polyvinyl acetate. when i type it in google i keep getting butan-2-yl acetate. but isn't the IUPAC name for acetate ethanoate ..? so would the proper IUPAC name for PVA be butan-2-yl ethanoate?

Physics
What is the equation for work?

Middle school Math
Graph 3y-4=11 by finding intercept(s) How do you do this... Thanks

Math
Stop cheating. gtfo. (Like Kevin, there is no doubt in my mind that you will be victorious.)

Chemistry
I'm doing an intro to organic chem, and i'm looking at the functional groups of organic compounds. More specifically, I am looking at melting/boiling points. I keep reading that one has a greater m/b pt. than another, but another one has a greater m/b pt. that one but ...

French
I need help with grammar, can someone check it out for me? 1. Une valeur mobilière est un fongibles, un instrument négociable représentant une valeur financière. Les deux types de valeurs mobilières sont les actions et les obligations. 2. Une...

electric potential
Given a square of side length a = 6 cm. We place a charged particle at each corner, three of them carry +7 nC of charge and one carries the same amount of negative charge. What is the electric potential at the center of the square? Choose V = 0 V for a position very far from ...

Chemistry
What are the products when you add water to 2-methyl-2-pentene?

calculus
dh/dx x = 7 , h (x) = (x^-1/2 + 8x)(4 - x^-1)

Personal Finance
The Lees, a family of two adults and two dependent children under age 16, had a gross annual income of $68,000 for 2007. Determine their standard deductions, exemption, and child tax credit amounts, as well as their marginal and average tax rates assuming their filing status ...

10th grade
I need to unscramble the letters to this word from the renaissance. The letters are NWIHZGLCIRULI

science
An athlete throws a basketball through a hoop. The ball leaves his hands at a height of 2.5 m with a speed of 9.0 m/s. Calculate the speed of the ball when it “swishes” through the hoop. The hoop is at a height of 3.0 m and it is 5.0 m along the court from the ...

Math
Yes. X=2-2t y=3t

Physics
Two events that are simultaneous in one frame of reference will be: A) simultaneous in all frames of reference B) simultaneous in another frame that is moving in the opposite direction C) simultaneous in another frame of reference that is moving in the same direction D) ...

Math
If the digits 1 through 9 are written in order, it is possible to place plus and minus signs between the numbers or to use no operation symbol at all to obtain a total of 100. For example,1 + 2 + 3 + -4 + 5 + 6 + 78 + 9 = 100 Can you obtain a total of 100 using fewer plus or ...

Algebra
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 ¡ä B (b) C ¡å D (c) ¡D¡ (d) ¡A ¡å D¡ (e) B ¡ä ¡C¡ (f) (B ¡ä C) ¡...

Algebra
Given the following function rules and domains, find the associated ranges. (a) f(x) = 2x +3, Domain = {0, 1, 2} (b) f(x) = 0, Domain = {0, 1, 2} (c) f(x) = 2x + x2, Domain = {1, 0, 2}

Algebra
16

statistics
Question 1 Question 1 1. Question 1 text The head of the History Department wants to compare the averages of 2 different instructor’s to see if they differ. A sample of 15 students in Instructor A’s class has average of 74 with a standard ...

math
estimate 4/5of 49

math
6/11x32 by using estimating product

math
2/3x35 by using estimating product

math
3/4x35 by using estimating product

math
7/8x30 by using estimating product

math
5/8x41 by using estimating product

math
2/9x26 by using estimating product

math
2/9x26 by using estimating product

math
3/7x29 by using estimating product

math
1/2x17 by using estimating product

math
1/5x26 by using estimating product

math
3/8x17 by using estimating product

math
5/8x19 by using estimating product

math
4/7x20 by using estimating product

math
what is 1/5x24 by using estimating product

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