Sunday
December 21, 2014

Posts by Libby


Total # Posts: 106

math
The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 165 and a variance of 9. The material is considered defective if the breaking strength is less than 157.8 pounds. What is the probability that a single, randomly selected piece...
December 9, 2014

chemistry
A mixture of ammonia and oxygen is prepared by combining 0.330 L of NH3 (measured at 0.710 atm and 22°C) with 0.200 L of O2 (measured at 0.740 atm and 51°C). How many milliliters of N2 (measured at 0.740 atm and 100. °C) could be formed if the following reaction ...
December 3, 2014

math
Give the probability in decimal form (correct to two decimal places). A calculator may be helpful. Last semester, a certain professor gave 15 As out of 396 grades. If one of the professor's students from last semester were selected randomly, what is the probability that ...
December 2, 2014

math
An oil-drilling company knows that it costs $25,000 to sink a test well. If oil is hit, the income for the drilling company will be $405,000. If only natural gas is hit, the income will be $125,000. If nothing is hit, there will be no income. If the probability of hitting oil ...
December 2, 2014

math
Evaluate the expression. 11! 6! 4! 2! 3! 1!
November 30, 2014

math
Tarot cards are used for telling fortunes, and in a reading, the arrangement of the cards is as important as the cards themselves. How many different readings are possible if five cards are selected from a set of nine Tarot cards?
November 30, 2014

math
The atmospheric pressure P in pounds per square inch (psi) is given by P = 14.7 e−0.21 awhere a is the altitude above sea level (in miles). If a city has an atmospheric pressure of 11.11 psi, what is its altitude? (Recall that 1 mi = 5,280 ft.
November 23, 2014

math
Let U = {9, 10, 11, 12, 13, 14, 15}, A = {9, 10, 11, 12}, B = {9, 10, 13, 14}, and C = {11, 13, 15}. List all the members of the given set. (Enter your answers as a comma-separated list.) (A ¾ B) ¿ C
November 9, 2014

Math 221
2 5 - / - 9 12 /-means divided by What is the simplest form?
July 6, 2014

Math 221
What is the simplest form?
July 6, 2014

Math 221
2 5 - / - 9 12 / is divided by
July 6, 2014

Math 221
It should be 60%
July 6, 2014

Math 221
A chess club with 55 members is electing a new president. Ali received 33 votes. What percentage of the club members voted for Ali?
July 6, 2014

Math 221
How do simplify 0.05(0.3m + 35n) – 0.8(-0.09n – 22m)
July 6, 2014

Math 221
Can you break it down for me to understand it better
July 6, 2014

Math 221
How do I simplify 2w – 3 + 3(w – 4) – 5(w – 6)
July 6, 2014

Math 221
How do I simplify 2a(a-5)+4(a-5)
July 6, 2014

algebra
The perimeter of a rectangular painting is 354 centimeters. If the width of the painting is 79 centimeters, what is its length?
July 4, 2014

Math
The perimeter of a rectangular painting is 354 centimeters. If the width of the painting is centimeters, what is its length?
July 4, 2014

Math
An isosceles triangle has an area A, an apex angle 2 theta, and a height of h. Determine an expression for theta in terms of A and h.
May 28, 2014

Biology
In snapdragon plants, neither one of the petal colors is dominant to the other. The hybrids have a intermediate phenotype. If a homozygous red flower is crossed with a homozygous white flower, What will the offspring’s phenotype be?_____________________________ (Use C for...
May 16, 2014

Math
If a an b are nonzero constant, simplify {√3 a sin (pi/b)}^2 + {√3 a cos (pi/b)}^2
May 13, 2014

Math
in triangle PQR, PQ=5.4, QR=3.6, and PR=6.2. to the nearest tenth, what is m<R?
March 27, 2014

Geometry
What translation rule can be used to describe the result of the composition of T<-5,-3>(X,Y) and T<-7,-1> (X,Y)? A. T<12,-4>(X,Y) B. T<-12,-4>(X,Y) C. T<2,-2>(X,Y) D. T<-4,-12>(X,Y)
March 27, 2014

Math
Use a translation rule to describe the translation of triangle ABC that is 8 units to the right and 2 units down.
March 26, 2014

Math
Find the circumcenter of angle EFG with E(4,4), F(4,2), and G (8,2).
March 10, 2014

Math
If triangle MNO is congruent to triangle PQR, which of the following can you NOT conclude as being true? A. line NO congruent to QR B. angle N is congruent to angle Q C. line MN is congruent to PR D. angle M is congruent to angle P
March 9, 2014

Geometry
Write an equation in slope-intercept form of the line through points S(-7,-6) and T(10,8).
March 9, 2014

math
what is 2/3 divided by 3
December 29, 2013

math
Thank You so much Miss Sue and Steve Have a Merry Christmas :)
December 18, 2013

math
Judy has 3/4 yards of yarn. For each scarf she makes, she needs 1/2 yards of yarn. Does she have enough fabric to make 2 scarfs? I say no because 3/4 divided by 1/2 = 1 1/2 am I right
December 18, 2013

science
why is Denver Colorado weather different then western new York?
December 17, 2013

math
thank you
December 10, 2013

math
Original Question is: how many 1/2 miles are in 12 miles? write the division question 12 divided by 1/2= 24 what multiplication question could the model also answer? 12 x 2 =24 This is the one I didn't understand Write the question given as a multiplication question?
December 10, 2013

math
There is a winter storm and the snow is falling at a rate of 4 inches/hour. Write 3 equivalent ratios associated with the following rate 4/inches/hour. How many inches will fall between 8pm and 12pm? I haven't a clue
November 24, 2013

math
5 CUPS EQUAL HOW MANY PINTS (x1pt/2c) I thought 10?
November 24, 2013

Math
Thanks every one :)
November 23, 2013

Math
WHAT WOULD 18/100 BE IN RATIO FORM, I THINKING 18:100 BUT NOT SURE?
November 23, 2013

science please help
Ok thank you this really helped sorry for all the questions!
September 30, 2013

science please help
So what would be a plan for converting all of the United States to metric as opposed to standard?
September 30, 2013

science please help
Also why don't we accept the Metric System as it in now used in other countries?
September 30, 2013

Science
Oh thanks this helped a lot!
September 30, 2013

Science
Please help! :)
September 30, 2013

Science
Why can't companies make standard measured products to sell within the USA and make metric measured products to sell outside the United States?
September 30, 2013

Algebra
The perimeter of a rectangle equals the sum of its lengths of its 4 sides. If the width of a rectangle is 4 inches and its perimeter is 38 inches, find the length of the rectangle.
March 16, 2013

Geometry
Forest rangers use degree measure to identify directions and locate critical spots such as fires. A forest ranger at tower A observes smoke at a bearing of 149 degrees (clockwise from the north) while another forest ranger at tower B observes the same smoke at a bearing of 250...
December 4, 2012

Algebra
If a trend line has equation y = -2x + 5, what type of association would you expect the data to have?
November 25, 2012

Algebra
Need help rewriting this as a decimal. 5*10^3 + 2*10^2 + 4*10^-1 = If you can please show me how to do this that would be so helpful!
October 29, 2012

Math/Algebra
Need help rewriting this as a decimal. 5*10^3 + 2*10^2 + 4*10^-1 = If you can please show me how to do this that would be so helpful!
October 29, 2012

Math/Algebra
If the first term of a finite geometric sequence is .4 and its ratio is .3 what is the sum of the first 5 terms?
October 29, 2012

chemistry
What is the formula for barium chloride
October 14, 2012

Math
How many different arrangements of seven letters can you make if you have seven distinct letters
September 13, 2012

Math
I need help solving a problem, I am stuck on this one. Write 128 in each one of the following bases a.Five b. Two c. Twelve
September 13, 2012

Algebra
You invested $1 0,000 on two stocks paying 8% and 10% annual interest, respectively. At the end of the year, the total interest fiom these investments was $940. How much was invested at each rate?
April 3, 2012

Algebra
Two trains start from the same place at the same time. They travel i~ opposite directions. One averages 60 miles per hour and the other averages 80 miles per hour. After how long will they be 420 miles apart?
April 2, 2012

distributive property
5x+5y rewrite the expression as a product using parentheses
November 21, 2011

science
A 6.90 kg penguin runs onto a huge sheet of frictionless Arctic ice. At t=0 it is at x=0 and y=0 with an initial velocity of 0.47 m/s along the positive x-axis. It slides while being pushed by the wind with a force of 0.49 N directed along the positive y-axis. Calculate the ...
September 15, 2011

Pre Calculus
Its actually 3 people, we need help with our hw , please and thank you
September 13, 2011

Pre Calculus
FACTOR COMPLETELY 1) x^8-y^8
September 13, 2011

Law
, list two pros and two cons of Uniform Crime Report (UCR) data and two pros and two cons of self-report data.
July 7, 2011

algebra
As you are leaving the community, you notice another new community just down the street. Because you are in the area, you decide to inquire about it. a. The sales representative here tells you they also have two floor plans available, but they only have 38 homes still for ...
June 21, 2011

algebra
1. Imagine you are in the market for a new home and are interested in a new housing community under construction in a different city. a. The sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to represent floor plan ...
June 21, 2011

physics
A proper lifetime of a certain particle is 100.0ns. a) How long does it live in the lab frame if it moves at V=0.960c? b) How far does it travel in the lab during that time? c) What is the distance travelled in the lab frame according to an observer moving with this particle.
March 10, 2011

physics
A proper lifetime of a certain particle is 100.0ns. a) How long does it live in the lab frame if it moves at V=0.960c? b) How far does it travel in the lab during that time? c) What is the distance travelled in the lab frame according to an observer moving with this particle.
March 10, 2011

Science
Express your answer as a balanced net ionic equation. Identify all of the phases in your answer
February 28, 2011

Algebra
there are 3 corners in a triangle. one is 44 degrees, another is 4x degrees, and the other is (2x+16) degrees. find the value of x
August 18, 2010

Science, Grade 8
what is the word equation for ... The reaction between iron metal and oxygen gas making soild iron oxide ?
June 20, 2010

Enthalpy Chemistry
THANK YOU! yes, i got 11180, i see what I did wrong.
June 7, 2010

Enthalpy Chemistry
Can someone make sure I did this write! What is the molar change in enthalpy when 100 g of ice is heated from -18.2 C to -72 C (Cp = 37.4 J/K*mol) 100g of ice = 100 g/-18.2 C = 5.56 mol 5.56 mol * 37.4 J/K * mol * 53.8 K = 1118 J
June 7, 2010

trig
Find all values of [theta] in the interval 0°<=X<= 360° that satisfy the equation cos2[theta]-cos[theta]=0
May 23, 2010

algebra
Find a common denominator, that is, multiply all fractions by x/x, then put the like terms together, and simplify:)
May 23, 2010

math/trigonometry
halve the middle term, then square it, then balance the equation by adding it to one end of the = side and subtracting it from the other. Then get everything over to the left side so you have 0 left again on the right side, simplify, and factor. After factoring, take the two ...
May 23, 2010

chemistry
okay so its (710)(500)/(303)=p2(27)/1073 then i multiply?
April 29, 2010

chemistry
im confused on what numbers need to be plugged into the equation
April 29, 2010

chemistry
An ideal gas is contained in a cylinder with a volume of 5.0 102 mL at a temperature of 30.°C and a pressure of 710. torr. The gas is then compressed to a volume of 27 mL, and the temperature is raised to 800.°C. What is the new pressure of the gas?
April 29, 2010

chemistry
An ideal gas is contained in a cylinder with a volume of 5.0 102 mL at a temperature of 30.°C and a pressure of 710. torr. The gas is then compressed to a volume of 27 mL, and the temperature is raised to 800.°C. What is the new pressure of the gas?
April 29, 2010

science
why are the hydrogen atoms in a water molecule are attracted to Cl− ions in sodium chloride (NaCl)?
April 1, 2010

chemistry
How many moles of carbon are needed to react with 5.01 mol SO2? How many moles of carbon monoxide form at the same time that 0.255 mol CS2 forms? How many moles of SO2 are required to make 125 mol CS2?
March 31, 2010

chemistry
How many moles of chlorine are needed to react with 3.30 moles of aluminum?
March 31, 2010

math
for ax^2 + bx + c with gradient 4x + 2 and a stationary value of 1 find a b and c and nature of point i think that its a minima and that its 2x^2 + 2x +2 but im not sure can someone check this please
February 28, 2010

chemistry/physics Urgent!!
how do i calculate the substrate concentration needed relative to Km to produce a rate relative to Vmax which is 0.1 x Vmax ?? I think i need to manipulate the michaelis menton eq but when i do it im left with [s] in the amount please help lib
February 25, 2010

organic chemistry
is an α,β-Unsaturated ester CH2=CHCO2Et more or less reactive than an CH2=CHOEt in electrophilic addition and where do the two slot into the reactivity order of CH2=CH2 < CH2=CHMe < CH2=CHBr i think CH2=CHOEt is more reactive than the Br equivalent but im not ...
February 20, 2010

intermediate algebra
its given coordinates which are in the form of (x,y) for the equation given ie x=5 and y = 1 so for q 2 if x= -3 y = 4-(3x(-3)
February 20, 2010

math
how do i simplify this further x^2/sqrt(x^2+y^2)+y^2/sqrt(x^2+y^2)
February 18, 2010

geometry
Katie is 100 cm tall and is standing so that her mother's shado covers her shadow. She is 90 cm from her mother and her mother's shadow is 225cm long. How tall is her mother?
January 14, 2010

9th grade
what is the study of interactions of biological, cultural, geographical and historical aspects of humankind?
August 25, 2009

Comp I
How do use annotation on a newspaper article? What are the guide/rules for using underlining/boxing/circling wors, use of special characters such as *, etc.?
August 17, 2009

Science
What is the life cycle of the pohutukawa? Please please help.
June 12, 2009

math
Can someone explain the Triangle Similarity, Or the AA Similarity, Theorem? We're doing proofs, and I don't think I understood the wording.
April 15, 2009

Science
i am doing a roller coaster project, and the coaster i picked was the Medusa in Marine World Six Flags. Now, I need help with the reqirements. We have to have at least 10 forces, and I have 9. I'm not too sure of what some of the forces are on a coaster. Any help would be ...
May 30, 2008

Algebra 1
using a constant rate, you can saw a log into 3 pieces in 12 minutes. At the sam constant rate, how long will it take you to cut a siliar log (if the same size) into 6 pieces? would you do a rate formula or what? I'm really stuck on this one!
May 20, 2008

Algebra 1
a girl that was 4 and a half feet tall was standing next to a telephone pole. at one 'o clock, her shadow was 8 ft. long, and the pole's was (i think) 36 ft. long, how tall was the pole? this is from memory, since i forgot to bring the paper home. but i believe that ...
May 15, 2008

Algebra 1
ok, so how did you get that??
May 8, 2008

Algebra 1
what you have, i understand, but he bought seven, not eight, so, thank you for telling me that, except now i'm stuck.
May 8, 2008

Algebra 1
your uncle buys a new car that comes with seven new tires, one for each wheel and three spare tires. He decides to be economical by using the tree spares as much as the other four tires. If he drives 22,750 miles and each tire has been used equally, what will be the wear in ...
May 8, 2008

Algebra 1
Your uncle buys a new car that comes with seven new tires, one for each wheel, and three spares. He decides to be economical by using the three spares as much as the other four. If he drives 22, 750 miles and each tire has been used equally, what will be the wear in miles on ...
May 7, 2008

physics
An incident X-ray photon of wavelength 0.2800nm is scattered from an electron that is initially at rest. The photon is scattered at an angle of 180.0degrees and has a wavelength of 0.2849nm. Use the conservation of linear momentum to find the momentum gained by the electron. I...
April 29, 2008

Algebra
I want to know if this is correct. the question is: Marissa, Cassidy, and Shante went to a school party. Marissa brought 2 bags of Skittles, and Cassidy brought 3 bags of Skittles. Shante forgot to bring candy to the party. Each bag contained the same amount of candy. If the ...
April 29, 2008

physics
Drift velocity is best defined as a. the relationship between current and current density b. the number of mobile electrons per volume c. the number of mobile electrons per length d. the flux of the current density through a given area e. the average speed of the motion of the...
March 23, 2008

maths
find the stationary points of the following function f(x)=x^3-3x^2-24x-7
February 12, 2008

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