Friday
October 9, 2015

# Posts by LUCY

Total # Posts: 811

Find two points on the graph of the parabola other than the vertex and x-intercepts. k ( x ) = ( x − 1 )^(2) − 6
October 7, 2015

Algebra
A rectangular auditorium seats 1960 people. The number of seats in each row exceeds the number of rows by 9. Find the number of seats in each row. Thanks!
October 6, 2015

algebra
The ratio of the tens digit to the units digit of a two digit number is 2:3. The number that results when the digits of the original number are reversed is 27 more than the original number. Find the original number.
September 27, 2015

math
the sum of the ages of two siblings is 23 and the difference between their ages is 7. if frank is the older brother of beth, determine their ages by creating a pair of simultaneous equations and solving them. this is killing me i have been working on it for hours. can only us ...
September 10, 2015

Physics
PLEASE HELP! this is do tomorrow :( I have no clue how to do any of it. A plane is flying horizontally with speed 193 m/s at a height 2010 m above the ground, when a package is dropped from the plane.The acceleration of gravity is 9.8 m/s^2. 1.What is the horizontal distance ...
September 9, 2015

Physics
A ball of mass 0.6 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker’s foot is 18 m/s at angle of 58◦ above the horizontal. The top of the fence is 10m high. The kicker&#...
September 9, 2015

ochm
sodium lauryl sulfate can be prepared by replacing chlorosulfonic acid with another reagent. what could be used? show equations
September 8, 2015

Pre-Calculus
Write an equation to fit the description. 0° Celsius = 32° Fahrenheit. 100°C = 212°F. (Let x = degrees Celsius and y=degrees Fahrenheit.) y=9/5x+32 Is this correct?
August 31, 2015

microeconimics
one type of systematic error arises because people tend to think of benefits in percentage term rather than in absolute dollar amounts. as an example, samir is wiling to drive 20 minutes out of his way to save \$4 on grocery item that cost \$10 at local market. but he is ...
July 10, 2015

math
A fisherman has estimated that it takes 6 minutes to paint each square foot of the hull of his boat. How much time should the fisherman allow for the painting of the hull, if the hull were composed of two sides, each 31.5 feet by 8.00 feet? 1512.0 hours 25.2 hours 3024 hours ...
June 18, 2015

math
yeah :/ and I don't know which I should be them
June 18, 2015

math
Last month, Bill's electric bill was \$80.77. This month, Bill's bill was \$69.06. What is the percent decrease? 0.01 0.16 0.15 0.14 my answer is 0.15
June 18, 2015

psychology
The biosocial approach suggests that gender differences are based on: a. the hormone and neurological differences between men and women. b. how men and women think about their environment. c. the physical ability of men to protect the home and of women to bear children. d. the...
June 18, 2015

Science
If you have a rocket with a mass of 30.0 kg, how much thrust will be needed to have a thrust to weight ratio of 3:1?
June 12, 2015

HISTORY
COMPARATIVE STUDY BETWEEN PARLIAMENTARY & PRESIDENTIAL FORM OF GOVERNMENT .
May 29, 2015

Math
Thank you so much!
May 17, 2015

Math
Seven students are running for four junior class representative positions in the upcoming student council elections. How many different ways can the students be chosen?
May 17, 2015

Math @Reiny
Write the standard form equation for the following Ellipse. Use the information given below. Foci: (0,0) and (4,0) Major Axis of length 8
May 13, 2015

Math
For #1 it says: Major Axis of length 8 Foci: (0,0) and (4,0) I forgot to copy the next part. Sorry.
May 13, 2015

Math
1.) Write the standard form equation for the following Ellipse. Use the information given below. Foci: (0,0) and (4,0) 2.) Write the standard form equation for the following Hyperbola. Use the information below. Vertices (-2,1) and (2,1) Foci: (-3,1) and (3,1)
May 13, 2015

physics
help pls. i need to find the best animation of the movement of electrons and protons... the best one... pls send me the link. thanks so much.
April 24, 2015

Calculus
how can you find the bounderies given by the curve x=4sqrt(y) and y=4sqrt(x)? show your solution please. thanks to anyone who will notice this!
March 30, 2015

genetics
Wild type, or wt, refers to the genotype that is the typical genotype found in nature. True False
March 22, 2015

genetics
Auxotrophs are organisms that can grow: A.on minimal media. B.only with sunlight. C.only on amino acid supplemented media. D.only on vitamin supplemented media. E.on any media.
March 22, 2015

genetics
Though this question sucks, which enzyme elongates the new DNA strand starting at an RNA primer? A.DNA polymerase I B.DNA polymerase III C.DNA polymerase II D.DNA ligase E.RNA polymerase
March 22, 2015

genetics
The two most basic steps of DNA replication are: A.primase causes primer to bind the template and ligase copies the template. B.helicase unwinds the template and DNA polymerase binds the template. C.leading strand is copied first and lagging strand is copied second. D.the new ...
March 22, 2015

genetics
What is a replication bubble? A.A complex of replication enzymes on the DNA template strand B.A DNA sequence that initiates replication C.A tangle of denatured DNA strands near the replication fork D.A locally denatured segment of DNA where replication originates E.A localized...
March 22, 2015

genetics
In E. coli, replication begins at which chromosome site? A.The replication fork B.Hfr C.oriC D.TATA box E.Pribnow box
March 22, 2015

genetics
The definition of transformation is: A.the shift of genetic information from DNA to protein. B.the recombination of DNA strands during meiosis C.the uptake of genetic information by a cell from the environment. D.the combining of DNA during fertilization. E.the changes caused ...
March 22, 2015

genetics
Antiparallel means that: A.the two polynucleotide chains run in opposite directions. B.each DNA molecule consists of one old and one new strand. C.opposite strands are held together by base pairing. D.the helix twists to the right. E.there is complementary base-pairing
March 22, 2015

genetics
complimentary base pairing allows for: A. spontaneous mutations to occur B. genes to be expressed as a phenotype C. DNA to serve as its own template for replication D. covalent bonds to form between the opposite bases E. The equalization of the purine and pyrimidine content of...
March 22, 2015

genetics
Which of the following are the purine nucleotides in DNA? A.Adenine and thymine B.Cytosine and guanine C.Adenine and cytosine D.Guanine and adenine E.Thymine and uracil
March 22, 2015

genetics
I PCR out a mutated gene in a patient with Lisenbee chorea (the inability to dance in a coordinated fashion) and I compare it to another patient with that same disease phenotype. One subject had a mutation on chromosome 4, and the other subject couldn't rock it because of...
March 22, 2015

genetics
With PCR, one gene is all that is necessary to create a useful genetic fingerprint to discriminate between individuals. True False
March 22, 2015

genetics
DNA markers, or variant non-coding regions of DNA, are DNA polymorphisms that are useful for genetic mapping. True False
March 22, 2015

genetics
DNA is often purified by DNA electrophoresis, like in old-school DNA sequencing. In DNA electrophoresis, fragment separation is based on _____. (Best answer) A.fragment charge. B.fragment size. C.fragment sequence. D.fragment G-C content. E. fragment A-T content.
March 22, 2015

genetics
Which of the following does not occur during the PCR reactions? A.Changes in the reaction temperature by a thermocycler B.Denaturation at high temperatures C.Synthesis of oligonucleotide primers D.Extension of primers by DNA polymerase E.Annealing of oligonucleotide primers
March 22, 2015

Genetics
Question 12 An Hfr strain with the genotype cys+ leu+ met+ strS is mated with an F- strain carrying the genotype cys- leu -met- strR . In an interrupted mating experiment, small samples of the conjugating bacteria are withdrawn every 3 minutes for 30 minutes. The withdrawn ...
March 22, 2015

genetics
kernel phenotype Number colored, shrunken, starchy 116 colored, full, starchy 601 colored, full, waxy 2538 colored, shrunken, waxy 4 colorless, shrunken, starchy 2708 colorless, full, starchy 2 colorless, full, waxy 113 colorless, shrunken, waxy 626 total 6708 Researchers ...
March 22, 2015

Genetics
The boss in your laboratory has just heard of a proposal by another laboratory that genes for eye color and the length of body bristles may be linked in Drosophila. Your lab has numerous pure-breeding stocks of Drosophila that could be used to verify or refute genetic linkage...
March 22, 2015

genetics
In tomatoes, the allele T for tall plant height is dominant to dwarf allele t, the P allele for smooth is dominant to the p allele for peach fuzz skin, and the allele R for round fruit dominant to the recessive r allele for oblong fruit. The genes controlling these traits are ...
March 22, 2015

Chemistry
How much time is required for a sound to travel 1 mile if the air temperature is: 0.0 Degrees Celsius 20.0 Degrees Celsius 40.0 Degrees Celsius 80.0 Degrees Celsius
March 12, 2015

Chrmistry
How many grams of hydrogen gas be produced from the reaction of 3 g of magnesium with 4 g of hydrochloric acid. identify the limiting in excess reactants. Please help btw that's the exact question.
March 8, 2015

Science
What will the sound of speed be in air if temp is 10 degrees Celsius.this is crickets looking for e plantation on equation
March 4, 2015

Algebra 2
The length of a rectangular window is 5 feet more than its width, w. The area of the window is 36 square feet. Write an equation to represent the area of the window. Please have your final equation equal to zero.
February 20, 2015

statistics
I am trying to figure out how the answer of 0.989 came from the following equation of correlation. 7(-5)-(25)(13) _______________________ /7(127)-(25)*/x/7(71)-(13)*
January 23, 2015

Calculus
Evaluate each telescoping sum: 1) Sum from i = 1 to 100 of (5^i - 5^(i-1)). I know that I could apply the (n(n+1))/2 summation rule to the 5^i part of the question and then plug in 100, but I am unsure what to do for the second half --> -5^(i-1)! Thank you for any help!
January 9, 2015

Chemistry
Thank you very much!!!
January 6, 2015

Chemistry
100lbs x453.6g/lbs = 45360grams 45360 grams x 1mol/18.02 g= 2517.2 moles 2517.2mol x 6.01kj/mol = 15128.4kj 45360 grams x 4.18j/g C x 100C x 1/1000 = 18960.5 45360g x 1 mol/ 18.02g x 40.6 kj/ mol = 102198kj All added equals 136287 kj 2.54E4 J /1g x #g = 136287 kj #g= 5.36 kj
January 6, 2015

Chemistry
How do I send a picture of my work here?
January 6, 2015

Chemistry
The heat of combustion of bituminous coal is 2.5 x 10^4 J/g. What quantity of coal is required to produce the energy required to convert 100. Pounds of ice at 0.0 degrees Celsius to steam at 100.0 degrees Celsius? Is the answer 5.36 about right. I'm not sure if I did it ...
January 6, 2015

Physics
An object has a volume of 4.0m^3 and weighs 40,000 Newtons. What will be its weight in water?
January 6, 2015

physics
The small piston of a hydraulic lift has a diameter of 8 cm and its large piston has a diameter of 40cm. The lift raises a load of 15,000 Newtons. A. Determine the force that must be applied to the small piston. B. Determine the pressure applied to the fluid in the lift.
January 6, 2015

Chemistry
Does an answer around 5.36563 kg sound about right? After adding q1+q2+q3 I got 136287 kj so I converted that to J and then found the #g coal to be 5.36563 kg.
January 5, 2015

Chemistry
The heat of combustion of bituminous coal is 2.5 x 10^4 J/g. What quantity of coal is required to produce the energy required to convert 100. Pounds of ice at 0.0 degrees Celsius to steam at 100.0 degrees Celsius?
January 5, 2015

physics
all i was need a formula
January 4, 2015

physics
a pendulum 3m long is displaced at an angle of 40 degrees. What will be the maximum velocity of the pendulum when it is released to oscillate?
January 4, 2015

physics
a car rolls down a ramp 4m long that has angle of incline equal to 37 degrees. If the car starts from rest, what will be its velocity at the bottom of the ramp?
January 4, 2015

physics
e. J-s
January 4, 2015

Chemistry
Are there any structural isomers of hydrocarbons from methane to decane have 3 stereogenic C atoms? (i know that there are none for decane itself, but I am wondering about the others before it.) Thanks in advance!
December 13, 2014

Physics
A roller coaster goes 40-m along a section of track sloping 10 degrees below the horizontal, followed by a 13-m section sloping upward at 6 degrees, followed by an 26-m section of level track. Find the net displacement in m.
December 7, 2014

Calculus
A sherman is in a rowboat on a lake and 3 km from shore. He wishes to reach a store 2 km down the (straight) shore. He can row at 5 km/h and run at 13 km/h. To what point down-shore should he row to get to the store as quickly as possible? 8. The cross-section of a tunnel
December 3, 2014

Calculus
For f(x)= (x+3)^2/(4x-5) find all x such that f(x) increases.
November 22, 2014

CIS
or nah
November 21, 2014

For any real number x there is a unique integer n such that n≤x<n+1, and the greatest integer function is defined as ⌊x⌋=n. Where are the critical values of the greatest integer function? Which are local maxima and which are local minima?
November 17, 2014

Physics
You have a tanker that is filled with olive oil, which total mass = 200 kg. The tanker is in the shape of a rectangular box w/vertical sides and a horizontal cross-sectional area 0.9 m^2. How deep a swimming pool do you need so that the tanker doesn't hit the bottom?
November 16, 2014

geometry
find the perimeter and area of each figure. Give your answers in simplest radical form. 1. a 30 degree-60 degree-90 degree triangle with hypotenuse length 28 centimeters
November 10, 2014

math
well a tree diagram would work better
November 8, 2014

chemsitry
How many moles of silver chromate will be produced from 146 g of silver nitrate?
November 3, 2014

Science
thank you
October 28, 2014

Science
is it one parent?
October 28, 2014

Science
Where does a clone recieve is DNA from? My guess is two parents
October 28, 2014

Math
A tree is losing its trees. Two thirds fall off in the first week, two thirds of those remaining fall off in the second week, and two thirds off those remaining fall off in the third week. Now there are 37 leaves. How many leaves did the tree have originally?
October 25, 2014

Calculus
Find an equation of the tangent line to the curve f(x) = (sins)^2 + 2tanx at x= pi/4. I worked through it and got y = 5x + 5/2 for my answer, but the answer key says that it is y - 5/2 = 5(x - pi/4). Why is the pi/4 in the answer? Thanks for any help!
October 19, 2014

Physics
A projectile is accelerated from rest at point A along a circular track of radius 2 m, as shown in Fig. 5.1. Gravity acts in the z direction. The rate at which the speed of the projectile increases as a function of time, t, is at = 2t ms-2. What is the magnitude of the ...
October 16, 2014

statistics
A box contains 19 red marbles and 19 green marbles. Sampling at random from the box five times with replacement, you have drawn a red marble all five times. What is the probability of drawing a red marble the sixth time?
October 12, 2014

Physics 30
inquiry lab determining the refractive index of a variety of materials (Snell's Law Lab): Basically this lab: We us a polar coordinate paper and a semicircular shaped containers which we switch between, which are composed of different material. We shine a narrow light ...
October 11, 2014

Math
A spherical balloon is to be deflated so that its radius decreases at a constant rate of 12 cm/min. At what rate must air be removed when the radius is 5 cm? Must be accurate to the 5th decimal place. I keep getting -3769.91118. What am I doing wrong? Please help!
October 5, 2014

Chemistry
How do I solve these problems You have 2000. g of aqueous NaOH solution. The percent by mass of the solute is 4.25%. How many grams of NaOH are in the solution? If you have 100.0 mL of a 25.0% aqueous solution of ethanol, what volumes of ethanol and water are in the solution?
October 4, 2014

real analysis
I mean prove the supremum of the set {2-1/n: n in N} is 2
September 30, 2014

real analysis
Hello. I want make sure im doing right step. Prove the supremum of the set A={2-1/n: n in natural number} is 3. My answer Proof: lets prove supA=2 Then 2 is an upper bound of A. Let S'<2, then S' is not upper bound. There exists x in A such that x> S' Then 0...
September 30, 2014

algebra
the cinema sold 600 tickets total. adults tickets were \$15 and childrens tickets were \$8. they made a total of \$7740. how much of each ticket were sold?
September 23, 2014

real analysis
i noticed it doesn't have x in them. i dont know what to do. prove: let epsilon>0. let f(x) = pi + 3 for x∈ real number. Prove your conjecture. Whether f is continuous for all r ∈ real number. my proof; |f(x)-f(r)|=|(pi+3)-(pi+3)|<epsilon so 0<epsilon ...
September 20, 2014

real analysis
thanks @MathMate
September 14, 2014

real analysis
definiton: A set S subsect of real number, sequence {Xn} is called bounded if there is a number M such that |X|≤ M for all x ∈ S prove the sequence (-8+(n/(n+1))) is bounded. my anwser proof: Let Xn = (-8+(n/(n+1))) there exist M in real number such that |Xn| &#...
September 14, 2014

math
Show that if a radioactive substance has a half life of T, then the corresponding constant k in the exponential decay function is given by k=-ln(2)/T I'm confused about how to show that that is true.
September 4, 2014

ethics
IS IT C?
September 1, 2014

math
how many minutes from 11:35 am till 12:50 pm?
May 31, 2014

Math
Find the quadratic polynomial whose graph goes through the points (-2,5), (0,5), and (1,11). f(x)= ______x^2+ ______x+ _______
May 4, 2014

music
ur vt9hg5gv
May 1, 2014

calc
If y^3 = 16x^2 Determine dx/dt When x= 4 and dy/dt= -1
April 21, 2014

Calc
A particle is moving along the curve y= 4 sqrt{2 x + 2}. As the particle passes through the point (1, 8), its x-coordinate increases at a rate of 5 units per second. Find the rate of change of the distance from the particle to the origin at this instant.
April 21, 2014

physics
Imagine having an 80-turn coil with radius of 5.0 cm and resistance of 30 Ù. At what rate must a perpendicular magnetic field change to produce a current of 4.0 A?
March 30, 2014

physics
A uniform magnetic field makes an angle of 30 degrees with the axis of a circular loop of 300 turns and radius of 4 cm. The magnetic field changes at a rate of 85 T/s. Determine the magnitude of the induced emf in the loop.
March 30, 2014

Math
1. Subtract k to both sides 6k - 8 - k = k - 2 -k 5k - 8 = 2 (Remember that k is basically 1k) 2. Add 8 to both sides 5k - 8 + 8 = 2 + 8 5k = 10 3. Divide 5 to both sides 5k/5 = 10/5 k = 2
March 19, 2014

math
2/5 are women There are 132 women Find the total 2/5 = 132/x 2x = 132*5 2x = 660 x = 330 Find how many men there are 1/4 = x/330 4x = 330 x = 82.5 There are about 83 men 132 + 83 + x = 330 x = 115 There are about 115 children at the circus show.
March 19, 2014

Chemistry
What is the concentration of hydronium ions in a solution that is 0.12 M HBrO(aq) and 0.160 M NaBrO(aq)?
March 19, 2014

Math
4 + 3p = 19 Subtract both sides by 4 4 - 4 + 3p = 19 - 4 You'll get 0 + 3p = 15 3p = 15 Divide both sides by 3 3p/3 = 15/3 You'll get p = 5 Hope this helps
March 19, 2014

math
Jack has 2009 unit cubes glued together to form a cuboid. He opens a packet containing 2009 stickers. He has enough stickers to stick one on each cube. How many stickers does he have left?
March 16, 2014

physics
A 6.0 Ù resistor and a 3.0 Ù resistor are connected in parallel to a 1.5 V battery of negligible internal resistance. What is the current in the 3.0 Ù resistor?
March 6, 2014

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