Sunday

October 4, 2015
Total # Posts: 1,791

**math**

Problem: A ball is dropped from the top of a building that is 250 feet tall. The height h of the ball in feet after t seconds is modeled by the function h = -16t2 +250. How long will it take for the ball to reach the ground? Round your answer to the nearest tenth if necessary.
*January 13, 2015*

**chemistry**

Sulfuric acid is dripped onto samples of three metals: silver, =zinc, and aluminium a) Use the activity series to determine whether a reaction will occur with each metal b) Write a chemical equation for each reaction that occurs
*January 11, 2015*

**algabra**

Janie's couch is 7 1/2 feet long.the scale of the dollhouse is 1 inch:2feet. what is the length of the miniature couch for the dollhouse?
*January 10, 2015*

**chemistry **

a 2.00l buffer contains 1.00 mol HNO3 mixed with 1.00mol NaNO2 a. write the relevant ionization equation for this buffer. b. determine its pH c. determine the new pH if 1.00g of NaOH is added to the buffer
*January 1, 2015*

**Math**

rick has a box of coins. The box contains 51 coins. Which consist of pennies, dimes and quarters. The number of pennies equal the number of dimes the total value of the box of coins is 5.73. How many dimes? how many pennies ? how many quarters?
*December 19, 2014*

**math**

A company will need 55,000 for a new addition. To meet this goal the company deposits money in an account today that pays 5% interest annual compound quarterly. to meet this goal in five years what would the company need to deposit today?
*December 18, 2014*

**Math**

given the function f decribed by f(x)=-x-6, find f(-7)=?
*December 16, 2014*

**ap physics**

a 37.4-kg traffic light is supported by two wires prove you answer applying newtons law
*December 4, 2014*

**Chem 130**

Carbon monoxide burns in oxygen to form carbon dioxide. what volume of oxygen at 25 degrees Celsius and 760. mmHg is required to react with 15.0 L of carbon monoxide which id at STP?
*December 1, 2014*

**Algebra 2**

Solving Quadratic Systems x^2+y^2=2 x^2-6y=10 I'm having trouble solving this problem.
*December 1, 2014*

**math**

a company will need $30.000 in 7 years for a new addition. To meat this goal the company deposits money in an account today that pays 7% annual interest compounded quarterly. find the amount that should be invested to total $30.000 in 7 years?
*November 28, 2014*

**IT**

The No Interest Credit Company provides zero-interest loans to customers. Design an application that gets customer account data, including an account number, customer name, and balance due. Output the account number and name, then output the customer's projected balance ...
*November 27, 2014*

**math!!**

5^6 * 5^3
*November 26, 2014*

**math**

can you explain more im lost . plz
*November 26, 2014*

**math**

conver the numeral to a numeral in base 10 1101 basetwo can some one plz help .
*November 26, 2014*

**math**

(-q^2 +3)(q^2 -2)mulitply
*November 21, 2014*

**math**

multiply (-5-p)(5+p)
*November 21, 2014*

**Math**

multiply -p(p+q+2)
*November 21, 2014*

**Physics**

A naked person (e=0.75) with a surface area 2.00 square meters and a skin temperature of 34 degrees Celsius is in sauna at 90 degrees Celsius. If he stays in the sauna for 30 minutes, (a) How much heat does the perspn radiates? (b) How much heat does he absorb from the walls ...
*November 19, 2014*

**chemistry **

Consider the reaction, 3 H2(g) + N2(g) => 2 NH3(g). How many grams of NH3 will be made by the reaction of 3 moles of H2(g) with 18 moles of N2(g
*November 16, 2014*

**chemistry **

Consider the following reaction: 2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O How many grams of B2O3 are made by the reaction of 233.8 g of O2
*November 16, 2014*

**chemistry **

Consider the following reaction: 2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O How many grams of O2 are needed to make 432.7 g of H2O?
*November 16, 2014*

**chemistry **

2.15 g of a substance X contain 4.34 x 1022 molecules of X. Calculate the molar mass of X in g/mol.
*November 16, 2014*

**chemistry **

Consider the equation: N2 + 3 H2 =>2 NH3. How many moles of NH3 will be made from 4.2 x 1023 molecules of N2? Give your answer to one decimal place.
*November 16, 2014*

**chemistry **

Consider the equation: N2 + 3 H2 =>2 NH3. How many moles of NH3 will be made from 2.1 x 1024 molecules of N2?
*November 16, 2014*

**chemistry **

Consider the reaction, 4 NH3 + 5 O2 => 4 NO + 6 H2O How many grams of NO will be made from 10.7 moles of O2?
*November 16, 2014*

**Pre Albergra**

The Pentagons ABCDE and PQRST are Similar: Find the length x of TP
*November 16, 2014*

**Chemistry **

How many moles of CO2 will be made from 115.4 grams of C3H8?
*November 16, 2014*

**Question**

What Behavior objective for large motor skills?
*November 15, 2014*

**Physics**

A copper wire that has been heated to 520 degrees Celsius for pliability is plunnged into 350 mL of water at 18 degrees Celsius. The final temperature of the copper and water bath is 31 degrees Celsius. Find the mass of the copper wire
*November 15, 2014*

**Physics**

would the answer by 3827
*November 15, 2014*

**Math**

convert the repeating decimal to a/b where a,b are integers and b #0.
*November 14, 2014*

**Stats**

A random sample obtained from a population has a mean of µ=100 and a standard deviation of ó = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean for a sample of n...
*November 11, 2014*

**chem**

what is the percent yield of the reaction between 5.2 mL of 0.1233 M barium nitrate and 4.9 mL of 0.1256 sodium sulfate if 0.140 grams of the precipitate are produced? Formula?... BaNO3(aq) + Na2SO4(aq) --> Na2NO3(aq) + BaSO4(s)
*November 11, 2014*

**Chem 130**

What mas of liquid mercury should be produced by the reaction between 5.0 mL of 0.1102 M mercury(II)nitrate ans 0.621 grams of silver metal? would the formula be... Hg(NO3)2(aq) + 2Ag(aq)--> 2AgNO3(aq) + Hg(l)
*November 11, 2014*

**Physics**

A small ball with a mass of 30.0 g is loaded into a spring gun, compressing the spring by 13.0 cm. When the trigger is pressed, the ball emerges horizontally from the barrel at a height of 2.30 m above the floor. It then strikes the floor, after traveling a horizontal distance...
*November 11, 2014*

**math**

James wishes to make a deposit. He has these bills: 16 ones, 5 fives, 5 tens, and 3 twenties. He has 4 nickels, 20 dimes, and 16 quarters. James has checks for $66 and $53.75. James wants to receive $50 in cash. What should he enter on the TOTAL line? $
*November 7, 2014*

**Chem 130**

How many tons of zinc can be obtained from 976 tons of zinc ore that is 78.0% zinc carbonate?
*November 4, 2014*

**Chem 130**

What is the percentage of water in copper (II) sulfate pentahydrate?
*November 4, 2014*

**English**

D is the best choice
*November 4, 2014*

**English**

Which of the following is the best version of a thesis statement about charter schools? a. A charter school is a tax supported established by a charter between a school board and outside group of teachers or parents. b.A charter school operates without local and state ...
*November 4, 2014*

**English**

All of the following are true special predicates except. A. A compound predicate is one that is passive. B. A predicate can have direct or indirect object. C.When a predicate is passive ,the subject is being acted upon rather an acting. D. A predicate may consist of two or ...
*November 4, 2014*

**English**

d. all of the above
*November 4, 2014*

**English**

A prepositional phrases include A. A preposition as about or above. B.an object of the preposition that is a noun or pronoun. C. any modifiers of the object of the preposition. d. I am think A
*November 4, 2014*

**English**

It not b
*November 4, 2014*

**English**

Compound predicates, predicates with direct objects and predicates with indirect objects,passive predicates.
*November 4, 2014*

**English**

All of the following are true special predicates except. A. A compound predicate is one that is passive. B. A predicate can have direct or indirect object. C.When a predicate is passive ,the subject is being acted upon rather an acting. D. A predicate may consist of two or ...
*November 4, 2014*

**chem**

How many grams of the adipic acid (C6H10O4) could form from the reaction of 15.00 g of cyclohexane (C6H12) with the 25.00 g of oxygen? Will the formula be... 2O2 + C6H12 ---> C6H10O4
*November 4, 2014*

**Chem 130**

How many grams of the adipic acid (C6H10O4) could form from the reaction of 15.00 g of cyclohexane (C6H12) with the 25.00 g of oxygen? Will the formula be... 2O2 + C6H12 ---> C6H10O4
*November 3, 2014*

**math**

f(x)= x^3 - 2x^2 - 21x - 18 all possible rational zeros # of possible positive zeros # of possible negative zeros find all the real zeros
*October 30, 2014*

**Chem 130**

How many grams of Aluminum oxide will be produced when 2.44 grams of Aluminum burns in air (i.e. react with Oxygen)?
*October 29, 2014*

**Chem 130**

wrong formula, would it be... MgCl2 ---> Mg + HCl
*October 29, 2014*

**Chem 130**

HNO3 + Al2O3 ---> Al(NO3)3 + H3O?
*October 29, 2014*

**Chem 130**

I want to make sure I have the correct double replacement formula. would it be
*October 29, 2014*

**Chem 130**

How many grams of magnesium chloride should be produced by the single displacement reaction between 0.578 grams of magnesium metal and an excess hydrochloric acid?
*October 29, 2014*

**Literature**

"Write a monologue revealing the unspoken thoughts and feelings of one of the characters in "Everything Stuck to Him." Use the personal pronoun "I." Choose one of the following scenes to step into the character's mind: a) the girl sitting up alone ...
*October 29, 2014*

**Physics**

A cargo plane is flying horizontally at an altitude of 11.2 km with a constant speed of 1260 km/hr when a large crate slides out of the rear of the plane. How long does it take the crate to hit the ground? The acceleration of gravity is 9.81 m/s 2 . Answer in units of s, please.
*October 27, 2014*

**Chemistry**

What does n equal in the dH equations? number of moles?
*October 26, 2014*

**Chemistry**

A 10.0 gram sample of a mixture of CH4 and C2H4 reacts with oxygen at 25°C and 1 atm to product carbon dioxide gas and liquid water. If the reaction produces 520 kJ of heat, what is the mass percentage of CH4 in the mixture? PLEASE HELP! I do not know where to even start!
*October 26, 2014*

**Chemistry**

In a titration for the determination of the chloride ion, a solution of 0.1M agno3 is used against a solution, the volume of which is 100ml. At the completion of the titration, the residual concentrations of silver and chloride ions are equal and the total volume is now 125ml...
*October 22, 2014*

**Chemistry**

In a titration for the determination of the chloride ion, a solution of 0.1M agno3 is used against a solution, the volume of which is 100ml. At the completion of the titration, the residual concentrations of silver and chloride ions are equal and the total volume is now 125ml...
*October 22, 2014*

**Physics: mechanics **

A 250g bullet with a speed of 500m/s passes through the center of a 1.5kg square wooden block [ side length 18cm] at rest upon a horizontal frictionless surface. As it exits the block, the bullet has a speed of 150m/s. A) find the initial speed of the center of mass of the ...
*October 20, 2014*

**math**

segment A'B is the image of segment A'B after a translation up by 6 units
*October 16, 2014*

**English (Macbeth)**

Act 3 What information is the audience given about the following characters: Malcolm Macduff Edward the Confessor Siward i really need help i think the answer for macduff is that he is trying to convince malcolm to help him overthrow Macbeth
*October 13, 2014*

**Physics graphing**

Im making a graph of magnetic force vs current, after investigating the magnetic force exerted on a current-carrying wire, and how it varies with current, length, magnetic field and angle. How do I know when to use the point (0,0) on the graph?
*October 13, 2014*

**Biology**

What is the location and effect of waves of contraction in the digestive system.
*October 11, 2014*

**ENGLISH CLASS**

Motivation is poor. complete sentence fragment run-on
*October 9, 2014*

**Biology**

Which heart beat measurement is most indicative of your general health? i think it is your resting heart beat, but im not sure the reason
*October 5, 2014*

**English**

My interpretation is that the moose resembles Christ due to the pain the moose has gone through, similarly to what Christ went through, such as the crown of thorns, and with the moose a girl puts a purple cap on him.
*October 5, 2014*

**alagbra**

5-4(12-3y)=
*September 23, 2014*

**statistics**

A sample of 100 patients who use the drug are followed over time. Those that use the drug have a mean life expectancy of 71.30 years. The mean life expectancy for the general population is 75.62 years. The population standard deviation is 28.
*September 20, 2014*

**statistics**

the wieights of newborn babies are distributed normally, with the mean of approximately 115 oz and a standard deviation of 20 oz. if a newborn baby is selected at random. what is the probability that the baby weighs more than 95 oz?
*September 18, 2014*

**statistics**

the weights of newborn babies are distributed normally, with the mean of approximately 115 oz and a standard deviation of 20 oz. if a newborn baby is selected at random. what is the probability that the baby weighs more than 95 oz?
*September 18, 2014*

**Chemistry**

Consider 2H2 + O2 ¨ H2O. To produce 0.895 g water, how many grams of O2 are required?
*September 15, 2014*

**computer science**

The problem is to calculate the usable area in square feet of a house. Assume that the house has a maximum of four rooms, and that each room is rectangular. I need help writing a program description,analysis,test,and with pseuocode with it.
*September 12, 2014*

**Math**

An all girl college began enrolling boys in 2005. By 2012 the ratio of boys to girls was 3 to 7. If there are 200 more girls than boys how many boys are there?
*September 6, 2014*

**Homework **

Q=wc(T1-T2) find c Can you help me find out how to do this problem PLEASE !! TY
*September 3, 2014*

**algebra**

Factor 24 And 16 6x4 2x8
*September 2, 2014*

**math**

15409
*August 26, 2014*

**math**

to determine the number of trout in a lake, a conservationist catches 111 trout,tags them throws them back into the lake.later 28 throw are caught. 14 of them are tagged. how many trout would be conservationist expect to be in the lake?'
*August 26, 2014*

**Introduction to Psychology**

I am working on a written final project and confused on how to apply psychological theories, processes, and concepts to human behavior. When it a person is believed to be suffering from major depression and then I am to Discuss psychological disorders and treatment approaches ...
*August 16, 2014*

**life science**

Gls bxs kep the fossls safe and permit people to look at al sides
*July 31, 2014*

**stats**

what is the probability that a 6 digit phone number contains at least one 8?
*July 19, 2014*

**Physics**

(a) Calculate the linear acceleration of a car, the 0.280 m radius tires of which have an angular acceleration of 15.0 rad/s2. Assume no slippage. (m/s2) (b) How many revolutions do the tires make in 2.50 s if they start from rest? (rev) (c) What is their final angular ...
*June 29, 2014*

**Physics**

Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1500 kg and was approaching at 9.00 m/s due south. The second car has a mass of 700 kg and was approaching at 15.0 m/s due west. (a) Calculate the final velocity of the cars. (b) ...
*June 26, 2014*

**Statistics**

I'm taking stats online which is making it even more difficult for me and I have nowhere to begin when answering this question. 1. A pharmaceutical industry claimed that their new product will lower the cholesterol level by an average of 14.5. To verify the claim, a ...
*June 22, 2014*

**Physics**

The rocket sled shown in Figure 4.5 accelerates at a rate of 29.0 m/s2. Its passenger has a mass of 66.0 kg. Calculate the direction and magnitude of the total force the seat exerts against his body.
*June 14, 2014*

**Physics**

Howdy Jason, this is Michelle! Unfortunately I tried that, as well as just adding the forces together. Neither are the correct answer. Thanks for trying to help tho :).
*June 14, 2014*

**Physics**

Two teams of nine members each engage in a tug of war. The first team's members have average masses of 67 kg and exert average forces of 1350 N horizontally. The second team's members have average masses of 72 kg and exert average forces of 1361 N horizontally. (a) ...
*June 14, 2014*

**Algebra**

Suppose a cost-benefit model is given by y=2771x/100-x, where y is the cost for removing x percent of a given pollutant. What percent of pollutant can be removed for $36,000? Round your answer to the nearest tenth of a percent?
*June 9, 2014*

**Chem 130**

How does the energy of a principal energy level depend on the value of n? Does a higher value of n mean a higher or lower energy?
*May 13, 2014*

**Chem 130**

How do I do this? Using the symbol of the previous noble gas to indicate the core electrons, write the electron configuration for each of the following elements. (a) zirconium, Z = 40 (b) vanadium, Z = 23
*May 13, 2014*

**Calculus**

Let R be the region enclosed by the graphs y=e^x, y=x^3, and the y axis. A.) find R B.) find the volume of the solid with base on region R and cross section perpendicular to the x axis. The cross sections are triangles with height equal to 3 times the length of their base.
*May 13, 2014*

**Chem 130**

What mass of CO2 could be absorbed by 1.37 g of CaO? What volume would this CO2 occupy at STP?
*May 6, 2014*

**Chem 130**

*Thanks!
*May 5, 2014*

**Chem 130**

Thank!
*May 5, 2014*

**Chem 130**

DrBob222, I still don't understand
*May 5, 2014*

**Chem 130**

Suppose two 100.0 L tanks are to be filled separately with the gases helium and hydrogen. What mass of each gas is needed to produce a pressure of 155 atm in its respective tank at 22°C?
*May 5, 2014*

**Chem 130**

A sample of oxygen gas is collected by displacement of water at 25°C and 1.11 atm total pressure. If the vapor pressure of water is 23.756 mm Hg at 25°C, what is the partial pressure of the oxygen gas in the sample?
*May 5, 2014*

**Chem 130**

If 2.03 g of helium gas occupies a volume of 12.0 L at 22°C, what volume will 6.19 g of helium gas occupy under the same conditions?
*May 5, 2014*