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Posts by Jack

Total # Posts: 1,773

math
if anna drew a circle that has an area of 153.86 square meters what is the radius of anna's circle

literature
in at least 4 sentences, compare and contrast the literary elements in the autobiographies of frederick douglass (my bondage and my freedom) and benjamin franlin

physics
an electric motor lifts on elevator 9 m in 15s by exerting an upward force of 1.2 x 10^4 calculate the power

Algebra
For how many two-digit prime numbers is the sum of its digits 8?

physics
Two charges are located along the x-axis. One has a charge of 6.2 µC, and the second has a charge of −3.1 µC. The Coulomb constant is ke = 8.98755 × 10 9 N m2 /C 2 The acceleration of . gravity is 9.81 m/s 2 . If the electrical potential energy ...

math
The n th term (Un) of a progression geometric is given by the formula 2(1.1)^n. Find the least value of n such that Un ≥ n

uniform motion science
How would you set up the following unifor motion problem... How long will it take the plane to fly 1000 km (i mile=1.61 km) if it is traveling at a constant velocity of 80 km/hr.

Science
How would you set up the following unifor motion problem... How long will it take the plane to fly 1000 km (i mile=1.61 km) if it is traveling at a constant velocity of 80 km/hr.

Algebra
what is the positive difference in the sums of the letters in the words MATH and COUNTS, if each letter is assigned a value as follows: A=1, B=-2, C=3, D=-4, ..., Y=25, Z=-26?

Algebra
A 5 digit positive integer is a "mountain number" if the first 3 digits are in ascending order and the last 3 digits are in descending order. For example, 35 761 is a mountain number, but 32 323 and 35 655 are not. How many 5 digit numbers greater than 70 000 are ...

math
Double my tens digit to get my ones digit. Double me and I am less than fifty.

math
If you multiply me by 2, I become a number greater than 20 and less than 40. If you multiply me by 6,I end in 8. If you multiply me by 4 I end in 2.

math
I am less than 100. The sum of my didgits is 4. Half of me is an odd number.

Chemistry
Quicklime (CaO) can be prepared by roasting limestone (CaCO3) according to the reaction CaCO3(s)  −!CaO(s) + CO2(g) . When 2.6 ×10^3 g of CaCO3 are heated, the actual yield of CaO is 1.06 ×10^3 g. What is the percent yield? Answer in units of %.

Chemistry
When 2.6 ×103 g of CaCO3 are heated, the actual yield of CaO is 1.06 ×103 g. What is the percent yield? Answer in units of %.

math
There are about 3400 species that represent 90 percent in the world what is the total number.

chemistry
why does a solution of ammonium acetate has a pH=7.5

calculus
y=x^3 y=8 x=0 about x-axis its using shell method i need step by step help seriously !!!!

operating system
How do you change a word in the header. Then close Header/Footer when done?

earth
Was there any magnetic pulling during the Mesozoic Era?

Algebra
How many different points of intersection are there for x + y = 7 and y = x squared minus 7?

math
derivative of ln(x^3 + 2)

Physics
If the angle of incidence is 30 degrees, what is the angle of reflection?

Intermediate Algebra
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 10x + 7y = -120.5 -20x – 14y = 241

College Algebra
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. <P-3x + 6y = -3 -6x + 4y = -10

algebra
To buy both a new car and a new house, Tina sought two loans totalling $260,394. The simple interest rate on the first loan was 3.7%, while the simple interest rate on the second loan was 8.8%. At the end of the first year, Tina paid a combined interest payment of $22,611.73. ...

intermediate algebra
Determine whether the point (0, 8) is a solution of the system -3x + 9y = 72 / 9x + 3y = 24

intermediat algebra
. Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -2x + 9y = 56 9x – 9y = 0

Physics
If two electrons (q = 1.60 x 10–19 C) are 1 m apart, what is the magnitude of the electric force repelling the two electrons?

English
1.Weren't you ______ to help me wash the dishes? (suppose) I have use correct form of suppose. Would it be suppose?

English
Thanks. Have a good night.

English
Using the correct form of (eat, ate, sit, set) 1.Someone (eat) all the leftover sandwiches. 2.Thank you, but I have already (ate, eaten) lunch. 3.After splitting the logs, the farmer (sat, set) his ax on the ground. 1.ate 2.eaten 3.set

English
1.We (see) tropical fish in the warm waters surrounding the island. 2.Have you (speak) to your parents about the field trip? 3.Teresa has (choose) the smallest piece of chicken. 4.Yesterday someone on the radio (sing) a song about Brazil. Just seeing if I have hang of it now. ...

English
1.dreamt 2.drank 3.sunk 4.taken 5.frozen 6.grown

English
Do you have another website to help me? I'm still confused. I looked over list.

English
1.I have often (dream) of becoming a great writer. 2.I (drink) two glasses of orange juice at breakfast today. 3.Their new boat (sink) in six feet water. 4.Generation have (take) wood and food from the rain forests. 5.The canal has (freeze), and the ferry can't get through...

science
if you weigh 100 pounds on earth than how much would you weigh on each other planet in our solar system

math
x^2 + y^2 - 8x -2y -3 = 0 the points S and T lie on the circumference of the circle. M is the midpoint of the chord ST. Length of Centre C to M is 2. whats the length of ST??

Physics
Nick, I'm working on this one myself. You can deduce from V = sqrt (T/M) where M=mass/length that f*2L = sqrt (T/M) but I keep getting the wrong answer for L. Unit conversion maybe?

business math
Stereo Inc. sells a stereo system for $300 down and monthly payments of $80 for the next 3 years. If the interest rate is 3.25 % per month, what is the cost of the stereo?

math
x=-2 output=12 x=1 output =9 x=4 output =6 help me solve

math
x=-2 output=12 x=1 output =9 x=4 output =6 help me solve

math
x=-2 output=12 x=1 output =9 x=4 output =6 help me solve

chemistry
how do you Prepare a 0.1 L of a 0.1 M NaCl solution, and describe the process in writing.

chemistry
how do you Prepare a 0.1 L of a 0.1 M NaCl solution, and describe the process in writing.

New Age Math
A value of the number m for which there is either no solution or an infinite number of solutions (u,w) to the system of equations shown below is: 6⁢u-w=6 m⁢u+6⁢w=-2

New Age Math
Given the initial augmented matrix -1 1 2 0 2 -1 -3 0 2 -2 -4 0 find the RREF

physics
change in momentum: p = m*(change in velocity) p = 91.8367 kg * (2 m/s) = 183.673 kg*m/s

physics
F = m*a 900N = m*(9.8m/s^2) m = 91.8367 kg a = (change in velocity) / (change in time) a = (Vf - Vi) / (change in time) a = (2 - 0) / (.7) = 2.85714 m/s^2 F = 91.8367 kg * 2.8571 m/s^2 = 262.391 N

physics
the mass you use is not 60g, it is .06kg. Sorry. Answer is .00015 sec.

physics
f=m*a 30000N = 60g * a a = (change in velocity) / (change in time) 30000N = 60g * (Vf - Vi) / (change in time) 500 = (75 - 0) / (change in time) change in time = .15 sec the change in time is the time that the ball was in contact with the club

physical chemistry
i think i figured it out

physical chemistry
1 kg aluminum dumbbell initially held 2 meters above the floor is allowed to fall. This experiment is performed inside a room whose dimensions are 10m × 5m × 3m. Assuming that the walls of the room do not conduct heat and that the room is empty (no other objects ...

Chemistry
How do I balance this equation and what is the answer? C3H9N+O2-->CO2+H2O+NO2

Chemistry
How much ice is required to cool a 15.0 oz drink from 71 F to 34F, if the heat capacity of the drink is 4.18 J/g*C? (Assume that the heat transfer is 100 % efficient.)

english
What is 7 letter word for finished. 3rd letter is R and 5th letter is U

Geography
a lot of reason :)

physics
Modern lasers can create a pulse of light that lasts only a few femtoseconds. (a) What is the length of a pulse of red light that lasts 6.2 fs? (b) How many wavelengths of red light (ë = 680 nm) are included in such a pulse?

physics
Modern lasers can create a pulse of light that lasts only a few femtoseconds. (a) What is the length of a pulse of red light that lasts 6.2 fs? (b) How many wavelengths of red light (ë = 680 nm) are included in such a pulse?

operating system
in windows vista, how do you organize file list by file size?

chemistry
V=359L

chemistry
What volume does a mixture of 14.2g of helium and 21.6g of hydrogen gas occupy at 28 degrees celcius and .985atm?

5th grade math
my bad it is 2/5 not 3/5

5th grade math
3/5 change the denominator to 15 by multiplying by 3 so it is 9/15-3/15=6/15 if you reduce it is 3/5

Spanish
22. C 23 a

Math help once again
10^y=x so 10^10=x

chemistry
thanks i solved it already

chemistry
Ammonia reacts with oxygen gas to form nitrogen monoxide and water. At constant temperture and pressure, how many of nitrogen monoxide can be made by the reaction of 800. ml of oxygen gas?

Spanish
it is asking if you have to have your lobster cooked with butter

Math
If line f is parallel to the line h, and line f has y-intercept 5, what is the equation of line f ? With h passing through two points (1, 2) and (3, 6)

CHM
Assuming the density of acetic acid solution is 1.0 g/mL, determine the volume of the acetic acid solution necessary to neutralize 25.0 mL of 0.10 M NaOH. Record this calculation on your report sheet

Math
If line g passes through point (2, 2) and is perpendicular to the line h, then what is the equation of line g? With h passing through two points (1, 2) and (3, 6)

Math
If line f is parallel to the line h, and line f has y-intercept 5, what is the equation of line f ? With h passing through two points (1, 2) and (3, 6)

Math
If line f is parallel to the line h, and line f has y-intercept 5, what is the equation of line f ? With h passing h through two points (1, 2) and (3, 6)

algebra
a rectangular sheet of plywood is seven times longer than its width,write an simlify an expression for the perimeter of the rectangle in terms of the width.

linear algebra
show that if L is any line through the origin in R3 and x is any vector with its initial point at the origin, then the reflection of x through the line l(acting as a mirror) is equal to 2(projection of x onto r)-x I don't know how to set this up. -x=2(projection of x onto ...

marketing
3M's main market for promoting this produc were college students. Their goal was to raise awareness of the Post-it flag highlighters within the the college community as much as possible. They used print ads in college newspapers and TV ads and relayed on word of mouth ...

Physics
A golf ball is chipped at an angle of 49 degrees and with a speed of 8.5 m/s. How far does it travel to the nearest tenth of a meter?

chem
At 20 degrees celsius the vapor pressure of dry ice is 56.5atm. If 10 g of dry ice (solid CO2) is placed in an evacuated 0.25 L chamber at a constant temperature of 20 degrees celsius, will all of the solid sublime? Is the answer no? I don't know if this is right, but I ...

Chemistry
What do I do when writing the net ionic equation for Magnesium nitrate reacted with sodium chloride? I've wrote out the molecular equation and the total ionic equation. Everything cancels out....under my total ionic equation do i just write no reaction? |thanks!

algebra
iove

algebra
8q2 – 3q – 2 = 0

physics
two masses m' each are hanging with help of a light string,which passes over mass less pulley. mass A starts leaking out at a rate of u kg/s with velocity v' with respect to mass A. find kinetic energy of block B as a function of time.

physics
a student standing on the roof of a 50 meter high building kicks a stone at a horizontal speed of 4 meters per second, how much time is required for the stone to reach the level ground below?

grammar
Ok thanks, so there are only two avderbs in this entire paragraph?

grammar
Need to identify five adverbs in this paragraph. I think I am correct but would like a second opinion. Thanks for your thoughts. LITTLE FOCKERS is the “continued” (adverb) antics of Greg and Pam Focker (Ben Stiller and Teri Polo) who “now” (adverb) have two...

nuclear engineering
Determine the amount of energy required (in MeV) to dissociate the following elements into component parts (protons, neutrons and electrons) • Hydrogen • Deuterium • Tritium

Math
Solve the proportion for u. (u-2):(u+3) = 4:3

math
On the unit circle the coordinates of P(theta) are (0.588, 0.809). Find the coordinates of P(2theta). Please help.

Math
A sweepstakes posted the odds and payoffs. Suppose that mailing the sweepstakes costs $0.33 and the odds in favor of winning the various prizes are listed in the chart below. What is the expected value of the sweepstakes for any individual? Considering the postage, is the ...

math
Can the expression (r-3)(s+2) be simplified without knowing the values of r and s?

math
If the probability of an event happening is 1/7, what are the odds against it happening? What is the ratio of the odds against the event?

math
180 m / 1 day 1 day = 24 hours * 60 min / hr = 1440 minutes Substitute 1440 minutes for 1 day in the original problem and you get: 180 m / 1440 min Reduce by dividing both the numerator and denominator by 180 and you get: 1 m / 8 min Divide both the numerator and denominator ...

math
Everyone of you has absolutely no idea how to solve this problem and you are simply adding to the questioner's confusion. If you don't know, just shut up.

Algebra
Two questions? Build a patio-hypotenuese is 50 feet long the two sides of patio are same. What is the length of one side of the patio I think I set it up a^2 + b^2 = c^2 a^2 + b^2 = 50^2 a^2+ b^2 = 2500 then I just could say 2a^2 = 2500 a^2 = 2500/2 a^2 = 1250 sqrt of 1250 = ...

Chemistry
I've got 21.2L, but supposedly correct answer is 21.7L. How?

Chemistry
Given 20.0 L of ammonia gas at 5C and 730 torr, calculate the volume at 50C and 800 torr

science
Chapter 1 & 2 Review Questions 1. Compare and Contrast the two main branches of physical science. 2. Distinguish between scientific laws and scientific theories. 3. Describe the steps of the scientific method. 4. Explain the objective of a consistent system of units, and ...

math
if possible, change each comparison of concentrate to water into a ratio. If not, explain why. a. the mix is 60% concentrate. b. the fraction of the mix that is water is 3/5 c. the difference between the amount of concentrate and water is 4 cups

accounting
Does the flexible budget term mean A series of budgets for varying rates of activity?

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