# 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: 6u-w=6 mu+6w=-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?