Thursday
August 21, 2014

Posts by Nancy


Total # Posts: 648

Math
At a summer camp, one boy and one girl will be selected to lead the weekly activities. If there are 130 boys and 145 girls at the camp, how many different 2 person combinations of 1 boy and 1 girl are possible?
February 5, 2013

Math
On friday, a computer was priced at $800. on the following wednesday, the price was reduced by 15%. On the following friday, the price was further reduced by 20%. what percent of the original price was the final price ?
February 5, 2013

Chemistry
180
January 29, 2013

english
The reason your voice matters is because its part of the way you want to be respected, spoken to, as well as you are part of a family of individuals. The fact that you have ideas of your own and you have values and an opinion is also why your voice should be heard. You have ...
January 8, 2013

geometry
LPG is stored in highly insulated spherical vessels in most oil refineriesif.If the inside diameter of one of these tanks is 11.4ft, find it's volume. Report your answer to the nearest one-tenth of a gal. Use r=3.14 and 1 cubic ft=7.5gal
December 29, 2012

geometry
find the volume of an industrial tank in the form of a horizontal cylinder whose radius is 2.6 yd, and whose length is 8.4 yd. rr=3.14
December 29, 2012

chemistry
When compound A is heated with acid compound B forms. Ahas the formula C3H8O and B is C3H6. When Ais oxidized compound D forms that is further oxidized to carboxylic acid. What are compounds A, B, and C.
December 17, 2012

chemistry
What is the pH of a solution prepared by dissolving 1.533 g HCl in water to make 420 mL of solution
December 17, 2012

biology
Following the usual pathway of circulation blood flows from the __________ to ___________, to_____________and to__________
December 14, 2012

biology
The ___________ ____________ supplies blood from the heart to all organs except the lungs
December 14, 2012

biology
Terms like punctiform and round relate to colonial ____________while smooth and curled relate to colonial___________
December 14, 2012

biology
Traditional phylogenetic results have been challenged by the results of _________________
December 14, 2012

pre-algebra
the perimeter of a pool is 150m. the width is 1/2 its length. what are the dimensions of the pool
December 13, 2012

Chemisrty
A 10.0 g sample of ice at -14.0°C is mixed with 124.0 g of water at 81.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g°C, respectively, and the enthalpy of...
December 9, 2012

Accounting
Harris company borrowed 65,000 by giving 10 year , 6% installment note to Cuba Bank The note requires annual payments of $8832 first payment occuring on the last day of the fiscal year. the first payment consists of interest of $3,900 and principal repayment of $4932, Issued ...
December 6, 2012

Psychology
the spillover effect is best explained in terms of the?
November 17, 2012

nuclear chemistry
wouldn't you divide by the speed of light squared? nuclear chemistry - andrew, Saturday, November 10, 2012 at 8:26pm E=mc^2 10^6 J/s are being produced (1Mw) 10^6 J/s = m (3.0e8 m/s) solve for mass to find amount of mass lost in one second. ~ .0033kg
November 10, 2012

nuclear chemistry
A typical nuclear reactor produces 1mw of power per day. What is the minimum rate of mass loss required to produce this energy. Don't know where to start
November 10, 2012

chemistry
never mind I got it thanks!
November 8, 2012

chemistry
This all that I have, what other information do I need?
November 8, 2012

chemistry
I need help with this lab. Write the equation for the decomposition of the hydrate, CuSO4*XH2O. Mass of crucible and hydrate: 93.000g Mass of crucible and pure salt: 91.196g I need to calculate the following: 1. mass of water in hydrate sample(g) 2. number of moles of water ...
November 8, 2012

math
Ashley needs $30 more in order to buy a concert ticket. she has saved money from her birthday and christmas presents. Her b-day present was 1.5 times the amount of her christmas present. Her b-day present was $60. if she saved 80% of her presents, how much does the concert ...
November 6, 2012

math
if 2 small containers and 1 large container together hold 10 cups of water, and 1 large container minus 1 small container leaves 4 cups of water, how many cups of water does the large container hold.
November 6, 2012

Business Math
Hafers, an electrical supply company, sold $4,800, 12%, 90-day note for a time extension of a bill for goods bought by Ron Prentice. On June 12, Scott discounted the note at Able Bank at 10%. What is the Maturity Value (MV).
November 6, 2012

psychology
For finals week, you had to be prepared for exams in english,math,spanish,italian,and history. how should the sequence of study be arranged to minimize the possibility of interference
October 26, 2012

math
3 out of 5 students own a pet. 6 out of 11 students own a pet. are the results proportional? explain reasoning
October 23, 2012

Chemistry
A vessel containing air (79% N2 and 21% O2) at 5bar and 280K is placed in a vacuum and a tiny hole is punched through the lid of the vessel. If the rate of effusion of O2 is 1.25x10^-7mol/s, at what rate is the nitrogen effusing? (in mol/s)
October 4, 2012

math
the hardware store is 5 blocks east of john's house. sean lives 3 blocks west of the bank, which is 4 blocks south and 2 blocks west of the hardware store. how many blocks and in what direction is sean's house from john's house?
October 1, 2012

math
the perimeter of rectangle y is equal to its area. rectangle z has the same perimeter as rectangle y. The length of rectangle z is 5 inches and the width is 3 inches. Explain how you can find the length and width of rectangle y.
September 25, 2012

Physics
You throw a ball downward from a window at a speed of 2.7 m/s. How fast will it be moving when it hits the sidewalk 2.9 m below?
September 18, 2012

Chemistry- rate laws
CH3CHO decomposes into methane gas and carbon monoxide gas. This is a 2nd order reaction. Rate of decomposition at 140 degrees Celsius is .10M/s when the concentration of CH3CHO is .010. What is the rate of the reaction when the concentration of CH3CHO is .50M? Have not been ...
September 18, 2012

math
1-How many three digit numbers are even? 2-how many three digit numbers are not even and do not divide by 5 ?
September 16, 2012

math
How many three-digit numbers are even ?
September 16, 2012

math
How many four-digit numbers divide by 5 ? Note:0001 is considered a 1-digit number .
September 16, 2012

math
Suppose a license plate requires three letters ,followed by three digits.how many license plates are there if the letters are all different and the digits are all different
September 16, 2012

chemistry
Determine the final temperature when 10g of steam at 100C mixes with 500g of water at 25C. I have 4.184x 10(100-x) + 40700 x 10= 500 x (x-25) x 4.18. The book has 10/18 instead of 10 on left hand side of equation. Why??
August 18, 2012

chemistry
Find the number of disintegrations per minute emitted by 1.1 mol of 232-Th in 1 min. The half-life of 232-Th is 1.4 x 1010 year I was able to do this with the following technique: 1.1 x 6.022 x10^23 =6.62x10^23 1.4x10^10=7.358x10^15 minutes I think then it is 6.62x10^23 x 7....
August 2, 2012

algebra/logs
I don't understand this problem: (1/2)n = 0.015625 n log 0.5 = log 0.015625 n = log 0.5 / log 0.015625 n = 6 When I plug log .5 into the calculator it gives .3010 and when I plug .15625 to the calculator it is -1.806 and that would be -.3010/-1.806 =.1666. How is the ...
August 2, 2012

algebra
solve the equation 5x^2=19x+4 X=
July 24, 2012

algebra
Find the number of decibels for the power of the sound. round to the nearest decibel. A rock concert, 5.35x 10^4 watts/cm^2
July 24, 2012

chemistry
I think I've got it by looking through the balanced equation. It is just hard to understand the NA repeated twice on the right side of the equation.
July 1, 2012

chemistry
you are right. It is Na2HPO4 + HI ==> NaI + NaH2PO4 for which the net ionic equation is HPO4^- + H^+ ==> H2PO4^- Can you explain how to get this, though? any steps would be helpful.
July 1, 2012

chemistry
I need to derive a net ionic equation after balancing: NA2PO4 (2-) +HI =? what I have so far is NA2Po4 +2HI = 2NAI +H3PO4 I can't get any farther but the answer is HPO4 (2-) +H =H2PO4 can someone help me with the steps?
July 1, 2012

finance
BBA307: Finance Exercise 8A Assignment 8.1 Assignment 8.1: Capital Budgeting Application You have just graduated and one of your favorite courses was Financial Management. While you were in school, your grandfather died and left you $1 million. You have decided to invest the ...
June 28, 2012

geometry
the arc length of AB is 2^pi ft. find the radius of the circle ABC=43 degree. round your answer to the nearest hundredth.
June 25, 2012

Geometry
I need help on a problem thats on formula for circumference. A circle has a circumference of 36 cm. find it's radius .but it says give an exact answer in simplest form and it says enter pi for the symbol of pie .
June 22, 2012

chemistry
You don't need to do a balanced equation for this one. 2.5x =.100(.50) x=.020 this would be 20 ml the formula is Liters x Molarity =Moles so 2.5Molar times x # of liters =.100 x.50 answer is 20ml
June 19, 2012

chemistry
molarity x liters = moles you would need to know how many moles or liters to use the above formula. How much NAOH are you being asked to find molarity for?
June 18, 2012

Chemistry
I don't know if I should be posting this on a new session or just the old one; I asked it yesterday and I have not seen a reply 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-...
June 18, 2012

math
actually David is right. I forgot the decimal place from the 22 so it is 54.5 amps
June 17, 2012

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

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