Monday
December 22, 2014

Posts by Nancy


Total # Posts: 698

math
E= I x R is the formula the answer is .5454 I=amperes R=ohms E=volts 12volts/22
June 17, 2012

chemistry
I have: the half life of U-238 is 4.5 x 10^9 yr. A sample of rock of mass 1.6g produces 29 disintegrations per second. find percent by mass of U-238 in rock. I have 4.5x 10^9x60x60x365x24=1.419x 10^17= .693/1.419 x10^17 =4.883x10^-18 =rate 1.6/238=.006722 x 6.022 x10^23=4.048 ...
June 17, 2012

Chemistry
2Na + 2H2O → H2 + 2NaOH is the balanced equation. from that, .113 mole/2=.0565 x -368 = -20.79kj or 20.79 kj heat is created in the reaction.
June 17, 2012

chemistry
Yes this does help! Thanks!
June 17, 2012

chemistry
A 1.50 liter gas sample at 745mm HG and 25 celsius contains 3.55% radon by volume radon-220 is an alpha emitter with a half life of 55.6 seconds. how many alpha particles are emitted in 5 minutes by this sample? I got an answer 1.59x10^19 I started at 745/760=.980263 then ....
June 17, 2012

Chemistry
X-rays have a wavelength in the range of 0.01 to 10 nanometers.. That would be a wavelength of up to 10 billions of a meter
June 17, 2012

Algebra 2
An ice-cream parlor sells sundaes with 3 different types of ice-cream and 4 different toppings. They have 8 flavors of ice-cream and 10 toppings for their customers to chose from. what is the probability that a customer orders a sundae including the toppings of whipped cream, ...
May 24, 2012

math
To turn a %number into a decimal just move the decimal over two spots from the whole number. So, for example 100% would be 1, or 33 1/3 would be .33333 which is 1/3 of 100%. The 1/3 part turns into .33 because 1/3 of a dollar is 0.33 cents. another example would be 25% is 0.25...
May 22, 2012

chemistry
Thank you Dr.Bob for your speedy reply-I also tutor in other subjects, but chem. is my nemesis.
May 15, 2012

English
"Spielberg's ability to communicate visually in the media of film is no doubt matched by his versatility as a public speaker." take it from there. giving examples of the oral topics he might cover as expressed already in his incredibly varied kinds of films, from...
May 15, 2012

English 2 Animal Farm
He simply represents a worldly point of view rooted in negativism based on experience (vs. the Intellect, the Evil, the populist)
May 15, 2012

chemistry
How many joules to vaporize 1.5 L of H2O at 19 degrees Celsius?
May 15, 2012

English
Note the individual words that have common associations:stagger, fall. note the repetition of vowel sounds within the lines to strengthen the mood.note how short the lines and words are, to mimic the nature of the scenery--harsh, barren, ie., tough.
May 14, 2012

Biology
I think that you calculate algebraically: since 400% is quadruple, divide that by 5.5% to get the # of years
May 14, 2012

Algebra 2
a hyperbola is centered at (3,7). The vertices are (9,7) and (-3,7). The slopes of the aymptotes are m==/-5/6. Enter the equation of the hyperbola in the form: (x-h)^2/a^2-(y-k)^2/b^2=1
May 14, 2012

Algebra 2
Soo the equation is 25y^2-9x^2-200y-36x+139=0 and for the center is got (2,4) and the vertices I got (2,7) and (2,1) But i cant figure out how to find the slopes of the asymptotes and it wants the answer is reduced fraction please explain
May 13, 2012

Writing
My own opinion on this issue is that it is past time for the government to take some responsibility in legislating the food products/garbage that is so heavily marketed through advertising--the detrimental effects of eating junk foods that lead to cancer, heart disease, ...
May 12, 2012

chemistry
I think that the base always contains hydroxide, aka OH; the original components were water mixed with an ammonium compound ( NH2)Check the chemistry reference tables too, which have tables that identify the bases and acids.
May 12, 2012

poems
Sammy sold seashells by the shoreline on oysters and mussels he did dine when the tide rolled in he went for a swim and forgot about selling those seashells
May 12, 2012

Algebra 2
A package with square ends has combined length and girth(girth is perimeter of a cross section) of 120 in. The surface area of the entire package is 3600 sq. in. Determine the dimensions of the package. s in. * s in.* l in. One solution is: 11.08in. * 11.08in. * 75.68in. Find ...
April 29, 2012

Math
a cylinder has a radius of r and a height of h. A rectangular box has a length of r, a width of h and height of h. Their combined volume is V=πr^2h+h^2r If their combined volume is 600 cubic inches and h is 5 inches, solve for the radius(r).
April 29, 2012

Math
the formula for the surface area of a cylinder is: A=2πrh+2πr^2 If the height of the cylinder is 10 inches, and the surface area is 200 sq. inches, determine the length of the radius
April 29, 2012

Algebra
The formula for the volume of a cylinder is: V=πr^2*h If the volume is 432 cubic inches and the height is 8 inches, solve for the length of the radius.
April 29, 2012

algebra2
If an object is thrown vertically upward with an initial velocity of v, from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s (where h and s are in ft, t is in seconds and v is in ft/sec) Solve for t when the object hits the ground. (when h=0) t...
April 27, 2012

Algebra 2
If an object is thrown vertically upward with an initial velocity of v, from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s (where h and s are in ft, t is in seconds and v is in ft/sec) If a rock is dropped from the top of a 200 ft building, ...
April 27, 2012

Algebra 2
A rectangular piece of cardboard has length that is 16 inches more than the width. The area of the cardboard is 297 sq. in. Find the measures of its width and length. Enter width in., length in.
April 26, 2012

Algebra 2
A farmer has 120 ft. of fencing available to enclose 2 adjacent rectangular pens alongside his barn. NO fencing is required along the bard side. He needs to have a total of 930 sq.ft. Determine the width (x) and the combined length of the pens. There are two solutions. One is ...
April 24, 2012

Algebra 2
√3x-4=2√x-5 Solve this equation, if there is more then one answer separate with a comma
April 19, 2012

Algebra 2
x= √3x+12+2
April 18, 2012

Algebra 2
√3x-4=2√x-5 Solve this equation, if there is more then one answer separate with a comma
April 18, 2012

Algebra 2
Solve this equation: √4x+8=6 If there is more then one solution enter with a comma
April 18, 2012

algebra2
evaluate without using a calculator 216 2/3
April 18, 2012

Algebra 2
SIMPLIFY: 3√(63x^5/(72y^6)) Example to enter answer: n√b, enter (b)^(1/n) Example: For 4√3:2, enter 4(2)^(1/3).What is my answer and how do i answer it?
April 17, 2012

Pharmacology
3/100
April 16, 2012

algebra2
How do i enter my answer? so the question is Simplify: √3:(63x^5/(72y^6)) and for my answer i got x√3:(7x^2/(2y^2)) but my work page says: Enter example: For 4√3:(2), enter 4(2)^(1/3) so how do i enter my answer
April 14, 2012

math
at a store you bought 2 pounds of apples and 1 1/3 pounds of grapes. If the store's scale measures to the nearest half pound, what is the range of possible actual weights for the sum of both purchases of fruits.
April 13, 2012

how do i enter my answer
√4:(32x^11y^15)/√4:(2x^3y^-2) for this equation i got =2x^2y^4√4:y and in my worksheet it says enter it: √b, enter sqrt(b). For example: For 4√3 enter 4sqrt(3) so how would i enter my answer
April 13, 2012

Algebra 2
√(21x^2y/(75xy^5) it says on my paper to enter it: √b, enter sqrt(b). For example: For 4√3 enter 4sqrt(3) Please help, I've got 5 wrong! :(
April 13, 2012

Algebra 2
An airplane flies 1050 km with the wind. In the same amount of time, it can fly 750 km against the wind. The speed of the plane in the still air is 200 km/h. Find the speed of the wind.
April 12, 2012

Algebra 2
Name this polynomial by its number of terms and degree.? √29x^6
April 12, 2012

Algebra 2
which property justifies this statement q+(r+s)=(q+r)+s a. communicative property of addition B. distributive property C. Associative property of addition D. identity property
April 12, 2012

Algebra 2
240,000,000x 0.000024/0.005 simplify and convert to scientific notation
April 12, 2012

Algebra 2
Evaluate the expression. 10x^3y^-5z^-2 if x=3, y=2, z=5
April 11, 2012

Algebra 2
which of the following are not polynomials? A. x^4+ πx^3+√2x B. 3x+x^4 C. 4x^3+2x^2+ √x D. 2x^3/5-x/3+π E.x/4-5/x+10
April 10, 2012

Algebra 2
The sum of two numbers is 100. One number is four more than three time the other number. What are the last numbers?
April 10, 2012

Algebra 2
Find (gº f)(-4) f(x)=-x^2+4 g(x)=2x
April 9, 2012

Algebra 2
Find the slope of the line containing these points. (1/8, 1/4) and (3/4, 1/2)
April 9, 2012

Chemistry
Why does equilibrium shift to the left when AgNO3 is added to the equation Co(H20)6 (aq) + 4Cl- (aq) <---> CoCl4 (aq) + 6H2o(l)?
April 8, 2012

statistic
The amount of time a bank teller spends with each customer has a population mean of 3.10 minutes and standard deviation of 0.40 minute. If a random sample of 16 customers is selected, a) what assumption must be made in order to solve parts (b) and (c)? b) what is the ...
April 7, 2012

statistic
The Tite Wire Company manufactures wires for circus acts. It has taken a random sample of 100 pieces of wire and wants to see if the thickness of a batch of wire meets minimum specifications. Assume that the population mean is 0.45 inch, with a standard deviation of 0.03 inch...
April 7, 2012

statistic
The distribution of cash withdrawals from the automatic teller machine at a certain bank has a mean of $500 with a standard deviation of $70. To reduce the incentives for robbery, the bank puts money into the machine every 12 hours and it keeps the amount deposited fairly ...
April 7, 2012

statistic
If 55% of a television viewing population watched a program called ¡§Name that Poem¡¨ one evening, what is the probability that, in a random sample of 100 viewers, less than 50% of the sample watched the program?
April 7, 2012

algebra2
Solve this formula for m. simplify your answer. S=H/m(a-b)
April 5, 2012

Algebra 2
two resistors are connected in parallel. Their resistances are 6 ohms and 10 ohms. What is the resistance, (R), of the combination? R=-----ohms?
April 5, 2012

Algebra 2
A resistor has a resistance of 15 ohms. What size of resistor, (r2), should be connected in parallel with it to obtain a resistance of 7 ohms. Use 1/R=1/r1+1/r2. r2= ohms?
April 5, 2012

Algebra 2
Solve this formula for r. Simplify your answer. E/d=R+t/r Make sure you use parenthesis around any polynomials in the numerator and or denominator.
April 5, 2012

Math
a motorboat can go 24 miles downstream in the same amount of time that it takes to go 12 miles upstream. The boats speed in still water is 12 mph. What is the speed of the river? mi/hr?
April 5, 2012

Chemistry
How do I write the skeleton equation then balance the following (step by step): hydrogen+bromine---> hydrogen bromide
April 4, 2012

statistic homework
If 55% of a television viewing population watched a program called ¡§Name that Poem¡¨ one evening, what is the probability that, in a random sample of 100 viewers, less than 50% of the sample watched the program?
April 4, 2012

statistic solution
The distribution of cash withdrawals from the automatic teller machine at a certain bank has a mean of $500 with a standard deviation of $70. To reduce the incentives for robbery, the bank puts money into the machine every 12 hours and it keeps the amount deposited fairly ...
April 4, 2012

statistic
The Tite Wire Company manufactures wires for circus acts. It has taken a random sample of 100 pieces of wire and wants to see if the thickness of a batch of wire meets minimum specifications. Assume that the population mean is 0.45 inch, with a standard deviation of 0.03 inch...
April 4, 2012

Algebra 2
(4x^3-3x^2+7x)/(x+1/2) Quotient and remainder
April 1, 2012

Algebra 2
(3x^4-5x^3+7)/(x+1)
April 1, 2012

Algebra 2
(3x^3+4x^2-7x+6) / (x-3) quotient and remainder
March 31, 2012

International Finance
What is an AA curve?
March 24, 2012

Algebra 2
(2x^3-x^2-48x+15)/(x-5) Divide and find the quotient and remainder?
March 23, 2012

Algebra 2
(4x^3-4x^2-x-3)divided by(2x^2-3)
March 22, 2012

Algebra 2
(4x^4-4x^2-x-3)divided by(2x^2-3) quotient an remainder?
March 21, 2012

Algebra 2
(3x^4-2x^3+4x-5) divided by (x^2+4) quotient and remainder
March 21, 2012

Algebra 2
(4-3/x^4)/(5+2/x3) Simpify, Leave in factored and reduced form.
March 20, 2012

Algebra 2
(5+3/x^2y)/(3+x/x^3y) Simplify. Leave in factored and reduced form. Put () around polynomials in numerator and denominator
March 20, 2012

algebra2
(4/y^2-1/y^3)/(2/y+3/y^2) Simplify. Leave answers in factored and reduced form. Put () around the polynomials on numerator and denominator.
March 19, 2012

Algebra 2
x^2/x^2+3x-10 - 1/x^2+8x+15 Simplify Leave in factored form and put () around polynomials
March 17, 2012

Algebra 2
(5y+5)/(y^2^+7y+6)*(y^2^+4y-12)/(y^2^+3y-10) Simplify Leave answer in factored form. Keep () around binomial factors.
March 16, 2012

CHEMISTRY
HOW MUCH 1 MOLE HCL IS REQUIRED TO MAKE 250ML OF 0.1 MOLE HCL?
March 14, 2012

Sociological
Using the sociological perspectives: functionalism, conflict, symbolic interactionism and feminism, show how Facebook has made an impact on today's technologically-advanced society.
March 4, 2012

Math
a chemist has an 18% acid solution and a 36% acid solution. How many liters of each of these solutions should be mixed together to make 24L of 30% solution? Enter two numbers separated by a comma
March 1, 2012

AJ
How do the three subsytems :law enforcement, cout, and corrections interact with each other? sorry for misspelling
February 23, 2012

AJ
How do the three susytems law enforcemnt, cout, and corrections interact with each other?
February 23, 2012

math
A board is divided into rectangles each 2/15 in long What is the length of one rectangle written as a decimal
January 19, 2012

Biology
how do animals that live in different enviroments meet their need for efficent gas exhcange? I was thinking maybe through their respiratory system? Body surface, lungs , gills, any specialized organs ? Or though the environment they live in ?
December 21, 2011

books
i couldn't find the answer can u give me the answers pleaseeeee i'm totally lost
December 15, 2011

books
what does winston thinks about people who are arrested from history? 2)who did winston see in the hallway? 3)what kind of notes does O'Brien gives to winston
December 15, 2011

books
what does it mean war is peace from the novel 1984?
December 15, 2011

U.S History
THanks
December 12, 2011

U.S History
help please What challenges did the United States face after the overthrow of saddam Hussein? Please help me ASAP thank you
December 12, 2011

Chemistry
A chemist ran the reaction and obtained 5.70 of ethyl butyrate. What was the percent yield? How do I solve this problem?
December 6, 2011

4th grade math
Is 1,725+346 more or less than 2,000? Explain how you can tell without actually adding.
December 1, 2011

4th grade
Explain how you would use front-end estimation to subtract 189 from 643.
November 30, 2011

Chemistry
Determine the final end (final) value of n in a hydrogen atom transition, if electron starts in n = 1 and the atom absorbs a photon of light with an energy of 2.044 X 10^-18J? A) 3 B) 4 C) 2 D) 6 E) 5
November 28, 2011

math
there are 7 red balloons and 4 fewer blue ballons. use cube trains to model the set of ballons.
November 18, 2011

algebra
During the first part of a trip, a canoeist travels 69 miles at a certain speed. The canoeist travels 2 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 3 hrs. What was the speed on each part of the trip?
November 16, 2011

english
What is the def. Of the word thing-a-ling how how to put it into a sentence. Can not find in dictionary.
November 14, 2011

chemistry
0.386M
November 6, 2011

chemistry
Calculate the volume of 1.60 in milliliters that contains 6.00 of solute.
October 29, 2011

Algebra, Geo and Measurement
The diagonal of a tv screen is 21 in. The television's diagonal forms angle "m", which measures 50 degrees. What is the height of the screen?
October 21, 2011

Math
a) f(x) = 4.1x +92.16 b) f(x) = 17.9x + 19.36 c) f(x) = 8.8x + 55.4 ANSWERS: a) 4.8 b) 0.93 c) 2.2, i just have no clue how they got these answers EXTRA INFO: The demand function for a new product is p(x)= - 4x +42.5, where x is the quantity sold in thousands and p is the ...
October 20, 2011

Math
a) f(x) = 4.1x +92.16 b) f(x) = 17.9x + 19.36 c) f(x) = 8.8x + 55.4 ANSWERS: a) 4.8 b) 0.93 c) 2.2, i just have no clue how they got these answers EXTRA INFO: The demand function for a new product is p(x)= - 4x +42.5, where x is the quantity sold in thousands and p is the ...
October 20, 2011

math
arrays and an expanded algorithm 23*17
October 10, 2011

Math
Kosuke wrote a mathematics contest consistingof 25 multiple choice questions, the scoring system gave 6 points for a correct answer, 2 points for not answering, and 1 point for an incorrect answer.Kosuke got x correct and left y unanswered questions a) write an expression for ...
October 9, 2011

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