Wednesday
May 4, 2016

# Posts by Zack

Total # Posts: 282

Algebra 1
A firework is launched from a cliff overlooking the ocean. The elevation of the firework shell, in feet above sea level, t seconds after launch is given by the expression -16t^2+157t+63. How high is the top of the cliff, in feet above sea level. We just started and my teacher ...
April 12, 2016

Maths
A fair coin is tossed 5 times. If X is the discrete variable the # of tails obtained, a) Draw the probability distribution . b) Find P (X<5)
March 22, 2016

Genetics!!
What is the function of a eukaryotic promoter sequence?
February 21, 2016

Genetics, HELP!!!
Planet X, a recently discovered planet, contains life forms that have double-stranded DNA as the genetic material. The DNA on Planet X is transcribed into RNA which is translated into protein. Planet X DNA contains only two bases: guanine (G) and cytosine (C), in a 20A wide ...
February 21, 2016

Math
For a specific type of machine part being produced, the diameter is normally distributed, with a mean of 15.000 cm and a standard deviation of 0.030 cm. Machine parts with a diameter more than 2 standard deviations away from the mean are rejected. If 15,000 machine parts are ...
February 12, 2016

Geometry
X is a point 7cm from the center of circle O with radius 9 cm. AXB is a chord of the circle such that AX= 2 XB. Find the length of AB.
January 29, 2016

Math
What is 29x47 in expanded algorithm
January 24, 2016

physics
A 550.27 N force is moving a 396.46 kg block at a constant velocity across a wooden plank. What is the kinetic friction force?
January 15, 2016

physics
A 19.62 kg block is sliding down a 34.52 degree incline at a constant velocity. What is the mu k of kinetic friction between the incline and the block?
January 15, 2016

apex geometry
i like butthole
January 8, 2016

Physics
A solid ball is released from rest and slides down a ramp that makes an angle of 50 degrees with respect to the horizontal. a) What is the minimum coefficient of static friction between the ramp and the ball for no slipping to occur? b) Would this coefficient of static ...
November 17, 2015

Math
A chemist wants to create a solution that is 24% acid. How many liters of a 40% acid solution must be added to 50 liters of an 18% acid solution to obtain this 24% acid mixture?
September 9, 2015

PreCalc
Find the slope of the radius of the unit circle that corresponds to the given angle. 7π/6 radians
September 8, 2015

PreCalc
Find the equation of the line in the xy-plane that goes through the origin and makes an angle of 1.2 radians with the positive x-axis.
September 8, 2015

Alaniz
An airplane is flying at an altitude of 4000 feet and descends at a rate of 200 ft./m determine whether the altitude is proportional to the number of minutes. Explain your reasoning?
September 1, 2015

algebra 1
Thx for helping me 😁
August 22, 2015

algebra 1
ccan someone helop me i need helo
August 22, 2015

algebra 1
If you place one staple on an electrionc, the balance still reads 0.0 grams.However ,if you place 210 staples on the blance ,it reads 6.80 grams .What is the mass of one staple ? - i dont understand this can u explan it
August 22, 2015

Physics
what is the schwarzschild radius of a black hole with a mass of 1.68x10^43kg
August 18, 2015

chemistry
If 765000 J of energy are added to 7.90 L of water at 291 K, what will the final temperature of the water be? Answer in units of K.
April 30, 2015

math
The 1st,5th,13th term of an arithmetic sequence are the first 3 terms of geometric sequence with a common ratio of 2. If the 21st term of the arithmetic sequence is 72, calculate the sum of the first 10 terms of the geometric sequence.
April 9, 2015

Math 115
A manufacture has been selling 1400 television sets a week at \$480 each. A market survey indicates that for each \$24 rebate offered to a buyer, the number of sets sold will increase by 240 per week. a) Find the price p(x) of each television as a function of x, where x is the ...
March 26, 2015

Math 115
The manager of a large apartment complex knows from experience that 90 units will be occupied if the rent is 444 dollars per month. A market survey suggests that, on the average, one additional unit will remain vacant for each 6 dollar increase in rent. Similarly, one ...
March 26, 2015

Math 115
A fence is to be built to enclose a rectangular area of 320 square feet. The fence along three sides is to be made of material that costs 6 dollars per foot, and the material for the fourth side costs 14 dollars per foot. Find the dimensions of the enclosure that is most ...
March 26, 2015

Math 115
The revenue from selling q items is R(q)=475q−q2, and the total cost is C(q)=175+6q. Write a function that gives the total profit earned, and find the quantity which maximizes the profit.
March 26, 2015

math
The height of a baseball (h) in meters (t) seconds after it has been tossed out a window is given by the equation h= -5t^2 + 20t + 15. A boy shoots at the baseball with a trajectory of h= 3t +3. Will the paintball hit the baseball? If so at what height and time?
March 22, 2015

Science
Why is photosynthesis an example of a chemical reaction, and why is it classified as endothermic?
March 13, 2015

physics
A 1-m-tall barrel is closed on top except for a thin pipe extending 5.2m up from the top. When the barrel is filled with water up to the base of the pipe (1 m deep) the water pressure on the bottom of the barrel is 10 kPa. What is the pressure on the bottom when water is added...
February 26, 2015

chemistry
formic acid is a weak acid with a ka value of 1.8x10^-4 at 25 celsius a solution with a concentration of .424M formic acid is prepared in a laboratory. 1) Write the ionization equation for an aqeous solution of formic acid 2)determine the ph of the solution prepared above. i ...
February 12, 2015

the answer is they live in cities
February 4, 2015

Math
My divisor is 9, I am greater than 7 times 9, I am less than 8 times 9,my remainder is 7,what dividend am I ?
January 15, 2015

Math
Jeffrey biked to the store at 12 miles an hour but took his time on the way home going 8 miles an hour. If it took him 20 minutes to get to the store, how many minutes did it take him to get back?
January 13, 2015

Math
Elizabeth took 13 minutes less than twice as long as Heather to solve the puzzle if their total time together was 23 minutes who took less time to solve the puzzle? How much less?
January 13, 2015

Math
The 80 8th graders took a trip. The boys numbered 16 fewer than twice the number of girls. How many of the eighth graders are girls?
January 13, 2015

english
I need help with finding some poetry devices in the poem: Wordsmith by Susan young. I already have some, but would love a second opinion.
December 7, 2014

geography
The environment of New York City includes water,land and air.It consists of high rise building or skyscraper.It is very busy and have lots of lights,it is the city that never sleep.
October 6, 2014

geography
How would you describe the environment of New York City?
October 6, 2014

Math
Hannah made 0.7 of her free throw in a basketball game,abra made 9/10 of her free throws,dena made 3/4 of her free throws,who was the best shooter and explain why you say so
June 1, 2014

Math
Amita decides that she wants the molds to have a square base.How many of the possible molds can she use?
May 21, 2014

science
2.27 m/s to the north
May 14, 2014

Calculus
A ball is thrown vertically upward with an initial velocity of 135 feet per second, the ball’s height after t second is s(t) = 135t – 22t How to calculate average velocity from 1 to 3 seconds?
March 22, 2014

Math
A kaleidoscope is a tube-shaped instrument that contains mirror and colored glass. When a viewer looks in one end, (s)he sees vibrant, changing patterns. Tami sees a kaleidoscope in the shape of triangular prism. It has a height of 4 inches, a base of 5 inches and a depth of 8...
March 18, 2014

Math
Thank you but it would have been better if you told me how to answer it not the answers
March 15, 2014

Math
1 Catriona is deciding how large of a cake to order for a party. She can choose from a 1-layer cake that serves 10 people, a 2-layer cake that serves 20 people, a 3-layer cake that serves 40 people, or a 4-layer cake that serves 65 people. The cost of the cake increases with ...
March 15, 2014

math
what is she made a 8 out of 22
February 18, 2014

math
lenzy has a 77 a c. as a grade. if she fails a test worth 26% 0/22 what will her grade be
February 18, 2014

please check these answers there really quick. 11.the zoo has recently acquired pandas,giraffes and lions. were does a comma belong? A. After and B. After zoo C. After giraffes(I PICK THIS) D. After acquired 12.Hector would you please relax? where does a comma belong? A. After...
February 18, 2014

Economy (vehicles)
What is a bi-wheel vehicle?
November 20, 2013

Physics
The road runner drops a boulder from a 53 meter high building. When the block is 14 meters above the ground, the 2 meter tall Wiley Coyote looks up and sees the boulder. How much time does he have to get out of the way?
November 3, 2013

physics
Larry stands on a bathroom scale while riding up in an elevator. His mass is 75 kg. At the current time the scale reads 100 lb. assuming the upward direction is regarded as positive, what is Larry’s acceleration in m/s2? What is happening to the elevator at this instant (...
October 22, 2013

Biomechanics
Larry stands on a bathroom scale while riding up in an elevator. His mass is 75 kg. At the current time the scale reads 100 lb. assuming the upward direction is regarded as positive, what is Larry’s acceleration in m/s2? What is happening to the elevator at this instant (...
October 22, 2013

English
I think this is C if not Which analogy would best go with this one? branch:tree:: A. flower:garden B. teo:three C. tentacle:octopus D. near:far
October 13, 2013

English
Would this be D if not Which analogy would best go with this one? A:Z:: A. girl:mother B. weight:pounds C. truth:lie D. prologue: epilogue
October 13, 2013

English
Whish analogy would best go with this one? A:Z:: A. girl:mother B. weight:pounds C. truth:lie D. prologue: epilogue
October 13, 2013

english
Create an accurate summary of “The Cold Equations” that details the important events of the story. Provide your answer in three to five sentences. Can someone help me with this please?
September 19, 2013

Algebra
One side of a triangle is 3 inches shorter than twice the length of the shortest side. The third side is 5 inches longer than the shortest side. If the perimeter is 110 inches, find the lengths of all three sides. So what are all the three sides?
September 12, 2013

Math
(2x2)-(3x2x-3)-(2x-3x2) 4 - 18 - -12 -14 - -12 -2
September 12, 2013

Algebra
When setting the price of admission tickets for the amusement park, Tabitha wants the price for a two child, two- adult family to be \$100. She also wants the adult tickets to cost \$8 more than twice the cost of a child's ticket. How much should a child"s ticket cost?
September 12, 2013

geometry
Assume that lines that appear to be tangent are tangent. O is the center of the circle. Find the value of x. Figures are not drawn to scale. m<P=14
May 24, 2013

Prove the identity: cos^4 x + sin^4 x = 1 - (1/2)sin^2 (2x)
May 5, 2013

Algebra
How many hands of 5 cards can be made from a standard deck of cards such that each hand contains exactly 1 red card and 4 black cards?
May 2, 2013

Chemistry 12
Determine the molar solubility of lead(II) iodide, PbI2, in 0.050 mol/L NaI. Ksp of PbI2 = 9.8 x 10^(-9)
April 23, 2013

Prove the following: sin(x+y)sin(x-y) = cos^2 (y) - cos^2 (x)
April 21, 2013

Physics
The electric field lines surrounding three charges are shown in the figure below. The center charge is q2 = -15.9 µC.
April 2, 2013

Math
80=20 divide 5
March 22, 2013

Math
What is the mathematical expression for 80 is 20 times as many as 5?
March 22, 2013

Math
How many frequent flyer point Indira earn if she traveled from new York city to Berlin ,Germany at a distance of 3,965
March 21, 2013

Writing
Compare how beaver stole fire and stealing fire from Zeus are the same
March 20, 2013

Math
Thanks
March 12, 2013

Math
How many strips of paper 4inches long and 1 inch wide can be cut from a piece of paper 8 inches long and 6 inches wide
March 12, 2013

Math
Thanks
March 12, 2013

Math
If there are 12 square tiles and each tile measure 1 foot on each side ,how many non congruent rectangle can you make.Each rectangle must use all 12 tiles
March 12, 2013

Math
If you h ave an 8 inches long and 36 inches wide strip ,how many strips of wood can you have if it is 4 inches long and 1 inch wide
March 12, 2013

Math
How many strips of wood can you have from an 8 inches long and 36 inches wide if the strips are 4 inches long 1 inch wide
March 12, 2013

Math
You will get 6 pieces
March 12, 2013

Math
How many strips of paper 4 inches long and 1 inch wide can be cut from a piece of paper 8 inches long and 6 inches wide
March 12, 2013

Math
12 feet
March 12, 2013

Math
Ms Washington buy a refrigerator that is 6 feet high, 3feet deep and 4 feet wide ,how many floor space does she need to fit the refrigerator
March 12, 2013

Math
List all 3digit numbers for which the sum of the digit is 3
March 12, 2013

Math
List all 2 digit numbers for which the sum of the digit is 5
March 12, 2013

Math
I think it's all the 2 digit numbers that when divided is equal to 5 ,e.g 10,15,20,25,30,35,etc.
March 12, 2013

Chemistry
How can I find the initial rate of formation of products {mol/((L)(s))}?
March 2, 2013

Chemistry
I'm getting really high negative percentage numbers.
February 4, 2013

Chemistry
But @DrBob222 where would I find delta T? Also, mass of water is 250 grams.
February 4, 2013

Chemistry
Sorry. There are 250.00g of water.
February 4, 2013

Chemistry
The complete combustion of 1.00 ml of octane increases the temperature by 22.7 degrees celsius. The density of octane is 0.7g/mL. What is the efficiency of the octane in heating the water?
February 4, 2013

math
t is 6
January 30, 2013

math
what is 4t=24?
January 30, 2013

Chemistry 12
Solid phosphorous is found in two forms: white phosphorous (P4) and red phosphorous (P). White phosphorous is the standard state. The enthalpy of the formation of red phosphorus is -17.6kJ. When 32.6 g of white phosphorous reacts to form red phosphorous. What is the enthalpy ...
January 18, 2013

Algebra 2
Simplify sqrt80 -3 Sqrt63 - sqrt125 - sqrt175
January 18, 2013

How do I verify this identity? (I've tried a lot but it's just not working) (sin2x + sin2y) = 2sin(x+y)cos(x-y)
January 17, 2013

Physics to be solved
a horizontal scaffold, of length 2.00 m and uniform mass 50.0 kg, is suspended from a building by two cables. The scaffold has dozens of paint cans stacked on it at various points. The total mass of the paint cans is 79.5 kg. The tension in the cable at the right is 837 N. How...
January 14, 2013

Physics
The driver of a car on a horizontal road makes an emergency stop by applying the brakes so that all four wheels lock and skid along the road. The coefficient of kinetic friction between tires and road is 0.39. The separation between the front and rear axles is L = 4.1 m, and ...
January 14, 2013

Calculus
evaluate each limit, if it exists [(2+x)^2 - 16]/ (x-2) what do I do?
December 22, 2012

Chemistry
given: 25.9 kJ + 1/2 H2 + 1/2 I2 => HI how much energy is needed for the reaction of 4.57x10^24 molecules of iodine, I2, with excess hydrogen, H2?
December 18, 2012