Saturday
May 28, 2016

Posts by matt

Total # Posts: 2,140

Chem
Thank you for your help.
November 2, 2015

Chem
If 0.256 g of a compound containing only carbon and hydrogen atoms is burned efficiently and 0.780 g of carbon dioxide and 0.356 g of water are produced, how many moles of H-atoms are contained in the original (0.256 g) sample?
November 2, 2015

PLEASE HELP MS SUE!!!!!!!!!!!!!!!!!!!!!4
Its Output cell
November 2, 2015

Chemistry
Two aqueous solutions, both at 25.00°C (100.0 mL of 0.223 M Pb(NO3)2 and 100.0 mL of 0.144 M Na2S), are mixed together in a calorimeter with a Ccalorimeter of 11.8 J/°C. The temperature of the solution increases by 2.40°C. Assuming that the density and heat ...
October 28, 2015

Computer programming
I am trying to write a program in C that would be used by a car rental company. This program finds the subtotal, tax amount(6%) and finally the total. The user enters in how many days the car was rented and how many miles were driven. The total is based on this logic. The cars...
October 27, 2015

Math 142 (calculus)
Determine d^2y/dx^2 for y=(5x^5+7)^4
October 20, 2015

Calculus
Find c so y=4x+3 is tangent to the curve y=x^2+c
October 16, 2015

Calculus
An open box with a capacity of 36,000 cubic inches is to be twice as long as it is wide. The material for the box is $.10/sq ft. What are the dimensions of the least expensive box? How much does it cost?
October 16, 2015

Calculus
An open box is made by cutting squares of side w inches from the four corners of a sheet of cardboard that is 24" x 32" and then folding up the sides. What should w be to maximize volume of the box? I started by trying to get a formula for the volume which I thought ...
October 16, 2015

Chemistry
@Dr.Bob222 I was answer that answer before but it was wrong
October 12, 2015

Chemistry
oh Ka is 3.5x10^-4. Sorry about that
October 12, 2015

Chemistry
What is the pH of a 0.0050 M solution of sodium fluoride? I got 7.58 for pH. Is it correct? but I try to plug in my quadratic formula, I don't get the pH 7.58. I'm really confuse. Please help.
October 12, 2015

Math
Tell if x and y show direct variation. Explain reasoning. 1) x=2y 2) y-x=6 3) xy=5
October 7, 2015

Physics
Draw a free body diagram and Apply Newton's 2nd law in both direction. 60 kg chair is pulled along a rough horizontal surface under the action of a 200N force 30 degrees up from horizontal, as shown the acceleration of the chair is 1.5 m/s^2. a) Determine the normal force ...
October 7, 2015

Comma question
Please use correct place comma for this sentence - Louisa bought mangoes and papayas and oranges.
October 6, 2015

Spanish
Thank you! that helped a lot!
September 25, 2015

Spanish
Esta mañana nos (1) _____ temprano en carro sin mapa. Al (2) _____ de la ciudad, Jorge (3) _____ al empleado de una gasolinera dónde (4) _____ el carril para acceder a la autopista. El empleado no (5) _____ contestarle porque no (6) _____ a dónde (7) _____...
September 25, 2015

SPAnish
Modifique el texto por cambiar los verbos italizados de lo familiar (informal) a lo formal Prepara (1) _____ para salir de viaje el lunes por la mañana. Para ello, haz (2) ______ las maletas, sal (3) _____ de la habitación y métete (4) _____ en el coche. ...
September 25, 2015

probability
The National Center for Educational Statistics reported that in 2009 the ACT college placement and admission examination were normally distributed and had a mean of 21.1 and standard deviation of 5.1. A college requires applicants to have an ACT score in the top 20% of all ...
September 21, 2015

AP Physics I
A placekicker is about to kick a field goal. The ball is 26.6 m from the goal post. The ball is kicked with an initial velocity of 19.0 m/s at an angle θ above the ground. Between what two angles, θ1 and θ2, will the ball clear the 2.8-m-high crossbar? (Hint: ...
September 20, 2015

Spanish
1 of 15 I tried to get there on time, but there was an accident on the freeway: Yo ____(1)____ llegar a tiempo, pero ____(2)____ un accidente en la autopista. Options 1-quise or queria 2-hubo or habia Answers 1- quise 2 -habia 2 of 15 They refused to admit that you already ...
September 19, 2015

probability
You and your friend just rented a car for an 8,000 mile cross-country road trip. Your rental car may be one of three different types: new (N), nearly one year old (O), and old (L). If the car you receive is brand new, it will break down with probability 0.08. If the car is ...
September 11, 2015

Physics. Help Please
Gabriele enters an east-w straight bike path at the 3.0-km mark and rides w at a constant speed of 8.0 m/s. At the same time, Xena rides east from the1.0-km mark at a constant speed of 6.0 m/s. 1. Write function x(t) that describe the position of Gabriele as a function of time...
September 11, 2015

probability
You and your friend just rented a car for an 8,000 mile cross-country road trip. Your rental car may be one of three different types: new (N), nearly one year old (O), and old (L). If the car you receive is brand new, it will break down with probability 0.08. If the car is ...
September 10, 2015

SPANISH
EL PRETÉRITO. Modifique el párrafo por cambiar los verbos italizados al pretérito. Ejemplo: Tenemos que preguntarle al revisor. Tuvimos que preguntarle al revisor. Voy___(1)___ a coger el tren para irme de vacaciones a la sierra. Ya no me queda___(2)___ ...
September 10, 2015

probability
You and your friend just rented a car for an 8,000 mile cross-country road trip. Your rental car may be one of three different types: new (N), nearly one year old (O), and old (L). If the car you receive is brand new, it will break down with probability 0.08. If the car is ...
September 9, 2015

math
An executive drove from home at an average speed of 45 mph to an airport where a helicopter was waiting. The executive boarded the helicopter and flew to the corporate offices at an average speed of 120 mph. The entire distance was 250 miles; the entire trip took three hours. ...
September 9, 2015

math
The weight of a bag of bricks plus 20% of its weight is 30 pounds. How much does the bag of bricks weigh, in pounds?
September 9, 2015

Stats
Explain what it means to have a deviation score of -18
September 8, 2015

Statistics
Assume that the unit of measure for each of the values in the sample is in dollars. What would be the units of measure for the sample: a) mean? b) range? C) Variance? d) Standard deviation?
September 8, 2015

probability
Alice and Bob each choose at random a number between zero and two. Consider the events events A: The magnitude of the difference of the two numbers is greater than 1/4. Event B: At least one of the numbers is greater than 1/4. Event C: Alice’s number is greater than 1/4. ...
September 7, 2015

probability
You and your friend just rented a car for an 8,000 mile cross-country road trip. Your rental car may be one of three different types: new (N), nearly one year old (O), and old (L). If the car you receive is brand new, it will break down with probability 0.08. If the car is ...
September 7, 2015

probability
Anne and Bob each have a deck of playing cards. Each flips over a randomly selected card. Assume that all pairs of cards are equally likely to be drawn. Determine the following probabilities: (1) The probability that at least one card is an ace, (2) the probability that the ...
September 7, 2015

World Geography
if 1/2 inch equals to ten miles how many inches are there in thirity miles ?
September 2, 2015

Algebra
Write 3 different algebraic expressions that uses x,y, and z and simplifies to the given value when x=-3, y=-2, and z=-1. The expression should involve only multiplication or division. Values are: 1, -16, and 12.
September 1, 2015

Algebra 2
1. A bag contains 12 red checkers and 6 black checkers. You will randomly select two checkers, one at a time, without replacement. (a) In how many ways can you select two checkers so that at least one of the checkers is red? List the ways. (b) What is the probability that you ...
August 26, 2015

math
A plane is flying at 168 miles per hour with a heading of 43.5° from due north. The wind is blowing a constant 33 miles per hour at 133.5° from due north. Find the ground speed and true course of the plane.
August 17, 2015

science
i think its A
August 17, 2015

science
Which of the following chemicals is insoluble in water? A. C6H6 {benzene) B. HCI (hydrochloric acid) C. NH3 (ammonia) D. NaHC03 (sodium bicarbonate)
August 17, 2015

Sophia
650ft/117.3ft/s=5.5 Is NOT the answer. Nor is 40.6 nor 7.4 nor 8.8 nor 16.2 nor 6.5. Nor is 0! Thinking they didn't stop at all before the crash!
August 12, 2015

Sophia
Algebra
August 12, 2015

Sophia
The following formula relates the distance S (in feet) traveled by a vehicle during an emergency stop to the time T (in seconds) it takes to arrive at a complete stop: s(t)=16t^{2} At the scene of an accident, Bill uses skid marks to determine the braking distance of one of ...
August 12, 2015

History
Ms Sue I am not understanding that is the Maccabean Revolt written for the gentiles to read in the future? Or is it for the Jews so they are aware of the past
July 19, 2015

History
What was the purpose of account of the Maccabean Revolt? Who was the intended audience?
July 19, 2015

experiment physics
Stress ke cari jawapan x jumpe
June 30, 2015

Chemistry
A solution of methanol and water has a vapour pressure of 213 Torr. What would you predict as the mole fractions of each component, assuming ideal behaviour? The vapour pressures of methanol and water are 256 Torr and 55.3 Torr, respectively
June 4, 2015

Chem.
Thank you
June 4, 2015

Chemistry
Do you mean 44.8L of Zn?
June 4, 2015

geometry
what is the surface area of a cube with side of 2 inches? what is the volume?
May 15, 2015

Math
Find the effective rate of interest (APR) for a loan with a loan amount of $6,300, a time of 270 days, and interest of $685.13. a. 14.5% b. 6.5% c. 9.3% d. 12.3%
April 21, 2015

math
Thank you
April 17, 2015

math
Simplify 6P2 A.30**** B.15 C.12 D.720 Simplify 8c5 A.6,720 B.336 C.56**** D.10
April 17, 2015

Science
What volume of aluminium has the same number of atoms as 8.0cm^3 of mercury?
April 16, 2015

math
NVM
April 13, 2015

math
NO ONE REPLIED.
April 13, 2015

math
How do i find the 12th term of the sequence 36,18,9.... using a formula
April 13, 2015

math
THANK YOU SO MUCH REINY.
April 13, 2015

math
How do i find the 12th term of the sequence 36,18,9.... using a formula
April 13, 2015

math
t12=36(1/3)^11 36(1/2048) =0.017578125 right or wrong?
April 13, 2015

HELPP
The volume of a rectangular prism can be computed using the formula V = lwh. What is the width of a prism that has a volume of 1664 cubic centimeters, a length of 16 centimeters, and a height of 8 centimeters? A. 11 cm B. 13 cm C. 26 cm D. 768 cm
April 7, 2015

math
write teh equation of the line: a line that goes through the point (-1,5) and has a slope of 2/3
April 6, 2015

physics
A 2.50m -long, 450g rope pulls a 10.0kg block of ice across a horizontal, frictionless surface. The block accelerates at 2.50m/s2 . How much force pulls forward on the rope?
March 27, 2015

Physics
You drop a rock from a 300-meter cliff. How long will it take to reach the ground? Assume it has no significant air resistance
March 26, 2015

Math Help
A right triangle has a leg B of length 7 and a hypotenuse of length 11. What is the length of the other leg A? Round to the nearest tenth, if necessary. A. 2.0 B. 8.5 C. 13.0 D. 9.6 Please help, I was gone for this lesson, just need someone to explain how they got the answer.
March 16, 2015

Dynamics
an 800 lb cannon fires a 5 lb cannonball in a horizontal direction. the cannon sits on a skid; the kinetic coefficient of friction between the skid and the horizontal surface is .25. if the cannonball has a speed of 650 ft/s when it leaves the cannon, determine a) the recoil ...
March 15, 2015

algebra
you research the cost of a gallon of gasoline over several years to look for trends the table shows the data you have collected what is the equation of the line of best fit how much would you expect to pay for gasoline in 2029 a)y=0.538x+1.36; $33.10 b) y=0.289x+1.75:$18.80 C ...
March 14, 2015

algebra
you research the cost of a gallon of gasoline over several years to look for trends the table shows the data you have collected what is the equation of the line of best fit how much would you expect to pay for gasoline in 2029 a)y=0.538x+1.36; $33.10 b) y=0.289x+1.75:$18.80 C ...
March 14, 2015

Calculus
A curve passes through the point (7,6) and has the property that the slope of the curve at every point P is 4 times the y-coordinate of P. What is the equation of the curve? Simplify the equation as much as possible.
March 9, 2015

physics
A painter is pressing a 125g paint pad against the ceiling with a force of 8.3 N at an angle of 30° from the vertical. The pad moves at a constant velocity. What is the coefficient of friction between the pad and ceiling?
March 5, 2015

Energy&Society
How do i find the fuel cost per energy unit (different energy sources). I don't have to calculate it. I just want to know from where I can get it.
March 5, 2015

Chemistry
Can we use moles of HCl instead of B to calculate limiting reactant?
February 27, 2015

Chemistry
When 0.500 moles of boron trichloride react with 1.20 moles hydrogen gas to produce elemental boron and hydrogen chloride gas, the actual yield of boron was 66.4 % of the theoretical yield. The mass of boron obtained was _____ g. Please help I'm stuck on it.
February 27, 2015

chemistry
sodium burns in chlorine to produce sodium chloride according to the reaction: 2Na(s) + Cl2(g) = 2NaCl(s). A student is asked to predict the mass of sodium chloride produced when 71 g of sodium is placed in a container of 200 g of chorine. The container is heated until the ...
February 23, 2015

STAT
.172
February 20, 2015

S.S.
what was "king" and the main topic of conversation in the south? politics sugarcane cotton slavery I was thinking COTTON was KING so C
February 19, 2015

science
can someone explain the life cycle of the animalia kingdom please
February 11, 2015

physics
a tsunami originating in japan has a wavelength of 10^5 m and a period of 10 mins. how long does it take to travel 8000km?
February 11, 2015

Math
The company needs at least $300,000 fire and theft insurance and at least $4,200,000 and liability for the from these plans. How many units should be purchased from H plan to minimize the cost of the premiums? What is the minimum premium?
February 7, 2015

physics
Four identical point charges (+2.51 nC) are placed at the corners of a rectangle, which measures 4.00 m by 7.00 m. If the electric potential is taken to be zero at infinity, what is the potential at the geometric center of this rectangle?
February 6, 2015

Calculus 2
wouldn't it be the integral of sqrt(1+u^2)du instead of integral u(sqrt (1+u^2)du because the du takes care of the outside u?
February 4, 2015

Calculus 2
integral of e^x(sqrt(1+e^(2x)))dx
February 4, 2015

Calculus 2
use the method of equating coefficients. integral of (x^3+5x^2+12)/((x^2)(x^2+4)) dx
February 4, 2015

physics
Air becomes conducting when the electric field strength in a region exceeds 3x106 V/m. if a spark jumps between a charged object and a grounded object when the two objects are 10 cm apart, what is the potential difference between the two objects? If a lightning strike is 4x103...
February 2, 2015

Physics
A hollow metal sphere has inner and outer radii of 20.0 cm and 30.0 cm, respectively. As shown in the figure, a solid metal sphere of radius 10.0 cm is located at the center of the hollow sphere. The electric field at a point P, a distance of 15.0 cm from the center, is found ...
January 29, 2015

physics
A +1.4-nC point charge is placed at one corner of a square (1.8 m on a side), and a -2.5-nC charge is placed on the corner diagonally opposite. What is the magnitude of the electric field at either of the other two corners?
January 29, 2015

algebra
The mean on a Advanced Algebra test was 78 with a standard deviation of 8. If the test scores are normal distributed, find the interval about the mean that contains 99.7% of the scores. Use the empirical rule.
January 28, 2015

Math, Algebra
I've done. y-(-3)=(5/2)(x-(-3)) y-(-3)=(5/2(-15/2) y=(5/2x)-(-15/2)+3 y=(5/2x)+(9/2) Is that correct?
January 19, 2015

Math, Algebra
I normally use point slope. I'm used to having to sets of points not just one.
January 19, 2015

Math, Algebra
Can someone help me figure this out for my review? Find the equation of the line that passes through (2,-3) and has a slope of (5/2)
January 19, 2015

Chemistry (Error Propagation)
Calculate, with uncertainty, and express with a reasonable number of significant figures. a) 5.4 (±0.2) – 3.7 (±0.4) = b) 6.84 (±0.04) × 0.7 (±0.04) =
January 19, 2015

math
The hire purchase price for a T.V set is made up of $4,000 deposit and 18 equal monthly installments of $1,200 each. Amos was given a discount of 20% on the hire purchase price on paying the cash for the T.V set. How much did he pay?
January 17, 2015

physics
F=ma 47.6 N=25.7 x a a=47.6/25.7 a=1.85 m/s^2
January 15, 2015

Math
A rectangle is 26 meters long and 18 meters wide.What is the length of the diagonal of the rectangle to the nearest meter? equation: A2 + B2= C2 I don't know where to put the numbers, but I think the answer may be 32. Thank you for any help!
January 12, 2015

Chemistry (Acid-Base)
I'm a tad confused by the question, The protonation constant for the acid HA has the value K=2*10^6. (a) what is the principal species at pH 6.00? (b) what is the principal species at pH 9.00? (c) what is the quotient [A-]/[HA] at pH 6.3 and 7.5?
January 12, 2015

math
adi, john ,and hailee plant seedlings in their neighberhood park. adi plants 40% of the total number of seedlings, john plants 45% of the total number of seedlings and hailee plants the rest of the seedlings.if hailee plants 87 seedliings how maany seedlings do they plant ...
January 10, 2015

Math
A certain infinite geometric series has first term 7 and sum 4. What is the result when the third term is divided by the second term?
January 8, 2015

Geometry
In rectangle ABCD, AC= 8x-10 and BD=2x+20. Find the length of BD
January 3, 2015

Geometry
So the answer is y= 2/3x +11 ?
January 3, 2015

Geometry
Find an equation of the line passing through the point (6,5) and perpendicular to the line whose equation is 2y+3x=6
January 3, 2015

Spanish
I have a question regarding #6. Why would this not be "antónimos"? To conceal and to declare are the opposite, are they not?
December 27, 2014

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