Tuesday
April 28, 2015

Posts by zach


Total # Posts: 335

chemistry
How many grams of solid ammonium chloride should be added to 1.50 L of a 0.224 M ammonia solution to prepare a buffer with a pH of 8.720 ?
April 3, 2015

College Algebra
A rectangular garden next to a building is to be fenced on three sides. Fencing for the side parallel to the building costs $60 per foot, and material for the other two sides costs $20 per foot. If $1,500 is to be spent on fencing, what are the dimensions of the garden with ...
March 26, 2015

Algebra 2
solve 3 square root 2x +1 =3 2x +1 under the sqaure
March 11, 2015

Algebra 2
solve square root 5-2x + 5 =12 5-2x under the sqaure
March 11, 2015

Algebra 2
solve square root 2x-5 =7 the 2x -5 is under the sqaure
March 11, 2015

math
A store sells one model of bicycle for $250. a. Write an expression for the amount of money the store receives if it sells b bicycles. b. How much would the store make if it sells 5 bicycles.
February 24, 2015

Algebra 2
divide using long division. (6x^2+4x-16)/(2x-2)
February 10, 2015

Algebra 2
solve each equation. x^4-81=0
February 10, 2015

Algebra 2
find the real solutions of each equation by graphing. 15x^4=11x^3+14x^2
February 10, 2015

Algebra 2
find the real solutions of each equation by graphing. 2x^4=9x^2-4
February 10, 2015

Algebra 2
Solve each equation. x^4 -x=0 x^4-81=0
February 9, 2015

Algebra 2
find the real solutions of each equation by graphing. 2x^4=9x^2-4 15x^4=11x^3 + 14x^2
February 9, 2015

Physics
A projectile is launched at 5.4 m/s with an initial angle of 22 degrees from an initial height of 2.6 meters. Where will it land? How fast, and at what angle will it be going when it hits the ground?
February 8, 2015

Chemistry
Draw the Lewis structure for each of these molecules. 1. PH3 2. H2S 3. HCl 4. CCl4 5. SiH4
January 28, 2015

Chemistry
A quantity of ice at 0.0 °C was added to 33.6 g of water at 45.0 °C to give water at 0.0 °C. How much ice was added? The heat of fusion of water is 6.01 kJ/mol, and the specific heat is 4.18 J/(g•°C).
January 26, 2015

Algebra 2
thanks
January 14, 2015

Algebra 2
find the factored forms of each expression. -9x^2 - 100
January 14, 2015

Algebra 2
suppose y varies directly with x and y=1 when x= -3. what is the constant of variation? what is x when y=4?
December 16, 2014

Algebra 2
what are the x and y intercepts of 2x +4y =8?
December 16, 2014

Algebra 2
find the slope of each line. a. y= 2x-3 b. 3y=7x =1
December 16, 2014

Algebra 2
write the compound inequality 3.1 less then or equal to m less than or equal 4.7 as an absolute value inequality.
December 16, 2014

Algebra 2
solve ax -3x + 5 = a+b for x. state any restrictions on the variables.
December 16, 2014

Algebra 2
thanks
December 16, 2014

Algebra 2
write an equation to solve the problem. find three consecutive even numbers whose sum is 144
December 16, 2014

Algebra 2
yes that's the equation
December 10, 2014

Algebra 2
write each function in vertex form f(x) =-2x^2 =6x + 10
December 10, 2014

Algebra 2
what is the positive solution of the equation 1/2x^2 -3x =5? solve by using a table or by graphing. if necessary, round your answer to the nearest hundredth.
December 8, 2014

Algebra 2
what is the positive solution of the equation 3x^2 - 5x - 7 =0? solve by using a table or by graphing. if necessary, round your answer to the nearest hundredth.
December 8, 2014

Algebra 2
what is the positive solution of the equation x^2 - 3x = 1? solve by using a table or by graphing. if necessary, round your answer to the nearest hundredth.
December 8, 2014

Algebra 2
what is the positive solution of the equation 5x^2 + 2x -16 =0? solve by factoring.
December 8, 2014

Algebra 2
what is the positive solution of the equation x^2 = 2x + 35? solve by factoring.
December 8, 2014

Math
1/24
December 4, 2014

chemistry
calculate the molarity of a g NaCl in 250 ml solution.
November 25, 2014

Math
If the largest two-digit number is added to 200, what is the sum?
July 7, 2014

algebra
I need some help with ln 's I am trying to solve : ln(x+3)- ln(x-5)= ln7 do I: ln (x+3)/(x-5)= ln 7 ?
April 11, 2014

physics
A passenger weighing 800 N is inside an elevator weighing 25000 N that rises 30 m in exactly 1 min. How much power is needed for the elevator's trip?
March 27, 2014

physics
How much time does it take a pulse of light to travel through 180\({\rm {\rm m}}\) of water?
January 20, 2014

Finite
An urn contains 5 white balls and 4 black balls. If 3 balls are randomly selected ( at once, without replacement ), what is the probability that at least 1 ball is black? Give answer as a decimal number with three correct decimal places.
November 14, 2013

math
arrays and an expanded algorithm 23 x17 how do I solve this
November 5, 2013

calculus and vectors
------------------------------------- \.56 degree ...........45 degree.../ \................................/ \............................../ \............................/ \........................../ \......................../ \______________________...
September 26, 2013

calculus and vectors
Reiny, I do not see how your calculation = 65.88, I get 25.2. Also, I do not understand your diagram. It looks like this ------------------------------------- \ 56 degree 45 degree / \ / \ / \ / \ / \ / \______________________/ | | | 35 newtons | | | |_____________________|
September 26, 2013

probability
A random sample of six integers in the interval [1,42] is to be drawn. The numbers are selected randomly, one after the other, and repeats are allowed. What is the probability the six numbers in the sample will all be different?
September 4, 2013

math
A very small population consists of 7 units, labeled a; b; c; d; e; f; g. How many di fferent samples of size 3 are there, for sampling without replacement, assuming that (a) samples are lists of units. (b) samples are sets of units.
September 3, 2013

Biology
What does the notation 4n = 28 tell you about how many types of chromosomes there are and how many of each type of chromosome are present in a cell? I am a little confused on how this is determined. Would it be 4 sets of chromosomes with 7 of each type of chromosome?
August 24, 2013

math
Shelly delivers the weekly local paper to neighborhoods in her town. House numbers are even on one side of the street and odd on the other. Shelly delivers an equal number of papers to both sides of the street. Although she always aims for the front doorstep, Shelly typically ...
July 21, 2013

math
Kalil flipped a coin sixty times. He got thirty-four heads. How does this result compare to the number of heads you would have expected based on theoretical probability?
July 18, 2013

math
Shelly delivers the weekly local paper to neighborhoods in her town. House numbers are even on one side of the street and odd on the other. Shelly delivers an equal number of papers to both sides of the street. Although she always aims for the front doorstep, Shelly typically ...
July 18, 2013

algebra 1
What is the solution set of the given equation? 4y - 6y + 9y = -2
July 13, 2013

algebra 1
Which of the following equations has the given solution set? Solution set: Ø
July 13, 2013

algebra 1
Which of the following would eliminate the variable on the left side of the given equation? 36 - 19w = -6w + 41
July 13, 2013

Physics
A tennis ball may leave the racket on a serve by a top player with a speed of 45.0 m/s. If the ball's mass is 0.063 kg, and it is in contact with the racket for 0.030 s, what is the average force (in newtons) on the ball?
July 12, 2013

Physics
A 17000 kg railroad car travels along on a level frictionless track with a constant speed of 23.0 m/s. A 5100 kg additional load is dropped onto the car. What then will be its speed in meters/second?
July 10, 2013

Math
Yes what I meant is that it decreased 1/4 of every its impact, so therefore the answer would be 60 mph after first impact.
May 6, 2013

Math
A rubber ball is thrown straight down from a height of 244 feet at speed of 80 feet per second. If the ball always rebounds with one-fourth of its impact speed, what will be the speed of the ball the third time it hits the ground? My Answer is: 1/4*80=60 1/4*60=45 1/4*45=33.75...
May 6, 2013

Math
I have 5 tickets for a raffle and I know that the probability of my winning the prize is 0.003. How many tickets were sold altogether?
April 23, 2013

Math
A 15-g sample of radioactive iodine decays in such a way that the mass remaining after t days is given by m(t) = 15e^(−0.051t), where m(t) is measured in grams. After how many days is there only 3 g remaining?
April 22, 2013

6th grade math
How to figure if 60 cookies were baked and 7/12 were given away, how many are left?
April 9, 2013

chemistry
When 1988 J of heat energy is added to 47.5 g of hexane, C6H14, the temperature increases by 18.5 °C. Calculate the molar heat capacity of C6H14.
April 7, 2013

Physics
A laser beam is being shot through two different materials that have been stuck together. if theta 1 = 65.5 and theta 2 = 49.8 what is the index of refraction? (I got 1.2 which is correct) but cant get part 2 PART 2~ If the index of refraction of n3 is 3.6, what is the final ...
April 4, 2013

POETRY, PART 2
#20
March 7, 2013

math
How do I find this integral using weierstrass substitution? 1/(9-4((sinx)^2))
March 1, 2013

math
How do I find this integral using weierstrass substitution? 1/9-4((sinx)^2)
March 1, 2013

Organic Chemistry
I am trying to figure out if I am correct about the solubility of 9-fluorenone in NaOH and diethyl ether and the solubility of benzoic acid in NaOH and diethyl ether 9-fluorenone is soluble in diethyl ether because it can hydrogen bond with water so it is soluble in the ...
February 18, 2013

math
from a square piece of cardboard with length and width of x inches, a square of width x-1 inches is removed from the center. Write the area of the remaining piece of cardboard as a function of x
February 13, 2013

Math
it is a rectangle with a height to length ratio of 2 to 25 . if the window is 24 feet high. how long is it?______ft
February 6, 2013

Physics
Well I did a similar problem but the speed was 1.5 instead of 1.6 and the answer there is 320 N/C, the proton doesnt hit the plates, the vertical displacement is 2.73*10^-6m and the displacement is downward.
February 5, 2013

Organic Chemistry
Why is the melting point of a known compound (ex. acetanilide) determined before the melting point of the unknown compound? I think it is to determine if the unknown is a pure substance but I am not sure..I just need to be pointed in the right direction.
January 31, 2013

Physics
how much heat energy needed to convert 125g ice 27 deg C to 50 deg C
January 31, 2013

Math
Chris cuts a 3 1/2 feet long board of wood. He cuts out 4 pieces that are each 2/3 foot long. Find the combined length of the 4 pieces? Find the length of the remIng board after chris gets his 4 pieces
January 17, 2013

math
A tree stands 75feet tall and cast a shadow that is 50feet long. What is the angle of elevation from where the shadow ends and the top of the tree
January 16, 2013

social studies
what are 2 unwritten practices of the roman republic?
January 9, 2013

Spanish
Im also from American hs lol but yeah its noun.
December 13, 2012

Chemistry
I am not sure if I calculated the exact molarity of the potassium permanganate. I multiplied the molarity of the potassium permanganate by the liters of potassium permanganate used in the titration and divided it by the total liters of solution. I don't know if that if how...
November 28, 2012

Chemistry
I am not sure if I calculated the exact molarity of the potassium permanganate. I multiplied the molarity of the potassium permanganate by the liters of potassium permanganate used in the titration and divided it by the total liters of solution. I don't know if that if how...
November 28, 2012

Chemistry
how do i find out what the normal boiling point of a liquid could be if the vapor pressure of the liquid is .92 atm at 60 degrees celsius?
November 19, 2012

Geometry
Help I need help to find the coordinates of the circumcenter of each triangle. Isosceles triangle CDE with vertices C(0, 6), D(0, –6), and E(12, 0)
November 15, 2012

physics
Fred the otter climbed to the top of an inclined plane. His friend, Giselle the giraffe, suggested that he was so small that gravity would ignore him and he would be unable to slide down. "On the contrary", said Fred, "Since this slope makes an angle of 48.4 ...
November 13, 2012

Physics
A mass-spring system has b/m = ω0/2, where b is the damping constant and ω0 the natural frequency. How does its amplitude A when driven at a frequency 12% above ω0 compare with its amplitude at resonance Ares at ω0?
November 12, 2012

Science
The products of the reaction between zinc and sulfuric acid are zinc sulfate, hydrogen sulfide, and water. Balance the equation using the electron-transfer method.
November 6, 2012

physics
An 8 g bullet is shot into a 4.0 kg block, at rest on a frictionless horizontal surface. The bullet remains lodged in the block. The block moves into a spring and compresses it by 7.9 cm. The force constant of the spring is 1400 N/m. What is the impulse of the block (including...
November 6, 2012

chemistry
how can we find which kinetic energy is higher?
November 5, 2012

math
How does finding the square root of a number compare to finding the cube root of a number? Use the number 64 in your explanation.
October 31, 2012

Algebra
The solution set for 6x^3-11x^2-9x-1=0
October 30, 2012

Physics
an 88kg cardboard box is being pulled along a level floor. the coefficient of static friction between the box and the floor is 0.23, and the sliding friction is 0.12. What is the weight of the box? What force is needed to start the box moving? What force is needed to keep the ...
October 29, 2012

Chemistry
I have done the calculation for this multiple times and I keep getting over 100% for the sodium carbonate in soda ash. I have no idea what I am doing wrong. I did it the way that you explained.
October 21, 2012

Chemistry
I used bromophenol blue as the indicator, and the molarity of HCl is 0.2M.
October 21, 2012

Chemistry
I titrated 0.25g of soda ash mixed with 25mL of deionized water and it took 43.7mL of hydrochloric acid to complete the titration. I am trying to figure out how to find the moles of sodium carbonate in the soda ash and then the percent of sodium carbonate in the soda ash. How ...
October 21, 2012

future job
thanks
October 18, 2012

future job
what do thet mean when they say Outlook:stable,increasing Job Openings: large number and very small number
October 18, 2012

Chemistry
I am trying to figure out how to calculate the reaction rate. In my question the reaction rate is: 1/2x molarity of sodium thiosulfate/reaction time Then I have to compare the rates of runs 1-3 and determine the orders of the reaction. Do I only find the reaction rate based ...
October 1, 2012

Chemistry
So I would multiply 3% by 20 mL which equals 0.6. Then I would divide 0.6 by 30% to get the volume of 30% hydrogen peroxide?
September 28, 2012

Chemistry
How would I find the volume of 30% hydrogen peroxide solution from 20mL of 3% hydrogen peroxide solution?
September 28, 2012

chemistry
Explain why the urea in particular, or amides in general, are much weaker bases than amines?
September 23, 2012

Organic Chemistry
Melting Point Determinations between urea and trans-cinnamic acid. Q. If urea were a significant base, specifically how would your Melting Point Diagram be different?
September 23, 2012

math
P(t) = 1000 - 19.75t + 20t² - 1/3t³, what type of function is it?
September 16, 2012

Chemistry
How would I find the percent of water lost in alum after it has dried for a week? Wet Alum = 13.44g Dry Alum = 11.28g
September 11, 2012

math
Chris has a 3 1/2 foot long board. He cuts out 4 pieces that are each 2/3 foot long. Find the combined length of the 4 pieces? Find length of the remaining board after chris gets his 4 pieces?
September 10, 2012

English
The complete subject is, Many stories about the first Valentine's day. The simple subject is stories.
September 5, 2012

English
What is the simple subject of ,Many stories about the first Valentine's Day exist?
September 5, 2012

math
one carton of juice is 10cm wide by 10 cm long. how many cartons of juice will fit on a refrigerator shelf that is 80 cm wide by 100 cm long?
August 31, 2012

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