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October 20, 2014

Posts by Erica


Total # Posts: 534

Math
Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them! Problems: 2.Your quiz grades are 19, 17, 20, and 15. What is the lowest grade you can receive on the next quiz and maintain at least an 18 average? 3.Stacey and Luis volunteer at the local hospital. ...
June 21, 2007

Math
Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them! Problems: 2.Your quiz grades are 19, 17, 20, and 15. What is the lowest grade you can receive on the next quiz and maintain at least an 18 average? 3.Stacey and Luis volunteer at the local hospital. ...
June 20, 2007

MathHelp
Directions are that i have to solve the equation and graph it using words.I have to include whether itis a solid or dotted line and which way the shading is. Problem: -2x+3y<-6 dotted line. There is no equals in the problem. Which way for shading... solve for y y<2/3 x -...
June 13, 2007

Algebra
Directions say that I have to solve and graph the equation using words.I have to include whether the lines are dotted or solid, how to graph each of them and where the solution is shaded. 2x-3y>_9 and -x-4y>_8 both should be solid, because the solution is greater than OR...
June 12, 2007

Science
How do clouds form, and where in canada would you expect to see certain types of clouds. What is the difference between clouds and fog? http://en.wikipedia.org/wiki/Cloud
May 20, 2007

Science
1. How do meteorologists forecast El Nino and La Nina? 2. Effects of El Nino and La Nina with regards to ocean currents and air currents. Meteorologists have not been very successful at forecasting them so far; it is mainly a question of monitoring it to see of they is there. ...
May 16, 2007

Science
Why is it impossible to have an Arctic Circumpolar Current? http://www.whoi.edu/science/PO/arcticgroup/projects/proshjohnson-two-regimes.pdf
May 12, 2007

Language Arts
How do I do a Bibliography for an interview? Thank you for using the Jiskha Homework Help Forum. Here are some sites on how to write a Bibliography and the second one is good for an interview: 1. http://dicksonc.act.edu.au/Library/bibliog.html 2. (Broken Link Removed) Here'...
May 10, 2007

Science
Can someone tell name 6 effects of ocean currents? Thanks Since this is not my area of expertise, I searched Google under the key words "'ocean currents' effects" to get these possible sources: http://www.thecanadianencyclopedia.com/index.cfm?PgNm=TCE&Params=...
May 9, 2007

12 chemistry
What is the average ion concentration in a 7.9 mL saturated solution of calcium hydroxide containing calcium chloride (CaCl2)?
April 24, 2007

Community College
waht is the impact of a stock repurchase on a companys debt ratio? Does this suggest another use for excess cash? The correct subject in the subject line will get you help in a more timely manner, and will aid in not wasting the time of other teachers. When a company ...
April 22, 2007

math
a small farm field is a square measuring 340 ft on a side. what is the perimeter of the field?
March 19, 2007

Business
What are the sectores of the economy? Since this is not my area of expertise, I searched Google under the key words "economy sectors" to get these possible sources: http://www.tutor2u.net/economics/content/topics/development/development_economy_sectors.htm http://...
January 15, 2007

unit rates
$60 for 8 h
December 19, 2006

Physics
Spent steam from an electric generating plant leaves the turbines at 120.0 degrees Celsius and is cooled to 90.0 degrees Celsuius liquid water by water from a cooling tower in a heat exchanger. How much heat is removed by the cooling tower water for each kilogram of spent ...
November 21, 2006

Physics
A 50.0 g silver spoon at 20.0 degrees Celsius is placed in a cup of coffee at 90.0 degrees C. How much heat does the spoon absorb from the coffee to reach a temp. of 89.0 degrees C? Rememeber this equation. It, or a slight modification of it, will work all of these heat ...
November 21, 2006

physics
lead is a soft, dense metal with a specific heat of 0.028 kcal/kg degrees C, a melting point of 328.0 degrees C and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 250.0 kg sample of lead with a temperature of 20.0 degrees Celsius? q1 = heat to move ...
November 21, 2006

Physics
Which provides more cooling for a styrofoam cooler, one with 10 lbs of ice at 0 degrees C or one with 10 lbs of ice water at 0 degrees C. Explain. qice=mass*heat of fusion. qH2O=mass*specific heat x delta T However, you aren't given a two temperatures; therefore, you can&#...
November 21, 2006

Physics
a 1.0 metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained by the hammer head, how much will its temperature increase? (Chead=0.11 kcal/kg degrees C) 1/2 m v^2 = mc Deltatemp solve for deltaTemp.
November 21, 2006

ethical issues
What international moral code, if any, is being violated by the Bank? What bank? What did "the Bank" do that might have violated international moral code? Please explain and we'll be glad to help you find the answer.
November 2, 2006

pre-calc
solve each system of equations using matrices x+2y-3z=0 2x-4y=z=-7 -2x+2y-3z=4 I dont see how it is possible to even attempt a matrix on this text oriented site.
October 24, 2006

pre-calc
find real numbers a,b,c so that the graph of the function y=ax^2+bx+c contains the points (-11,4), (2,3) , and (0,1) Write three equations, with each point in one. Then solve the three equations.
October 24, 2006

pre-calculus
Solve eacy system of inequalities. If the system has no solution, say that it is inconsistant. x -y -z = 1 2x +3y +z = 2 3x +2y = 0 add the top two equations. 2x+2y =3 That is inconsistent with the last equation.
October 24, 2006

Pre-Calculus
The logistic growth model p(t)=0.90/1+3.5e^-0.339t relates the proportion of new personal computers sold @ Best Buy that have Intel's latest coprecessor t months after it has been introduced. a) what proportion of new personal computers sold @ Best Buy will have Intel'...
October 19, 2006

Pre-Calculus
A culture of bacteria obeys the law of unlimited growth. If 500 bacteria are present initially and there are 800 after 1 hour, how many will be present in the cultrue after 5 hours? How long until there are 20,000 bacteria? Hmmm, what is "the law of unlimited growth"...
October 19, 2006

Pre-Calculus
The formula D= 5e ^-0.4h can be used to find the number of milligrams D of a certain drug that is in a patient's bloodstream h hours after the drug has been administered. When the number of milligrams reaches 2, the drug is to be administered again. WHat is the time ...
October 10, 2006

Pre Calculs
The pH of a chemical solution is given by the formula pH = -log10 [H+] where [H+] is the concentration of hydrogen ions in moles per liter. Values of pH range from 0 (acidic) to 14 (alkaline). (a) what is the pH of the solution for which [H+] is 0.1? (b) What happens to pH as ...
October 10, 2006

Pre-Calculus
The period T (in seconds) of a simple pendulum is a function of its length l (in feet), given by T(l) = 2pi sq root of l/g, where g = 32.2 feet per second per seconds is the acceleration of gravity. Express the length l as a function of the period T. If T=2pi*sqrt(l/g) then do...
October 5, 2006

Pre-Calculus
The function f(x)= x^4 is not one-to-one. Find a suitable restriction on the domain of f so that the new function that results is one-to-one. Then find the inverse of f. Restrict it to be non-negative to meet the 1-1 requirement.
October 5, 2006

pre-calculus
the spread of oil leaking from a tanker is in the shape of a circle. If the radius r (in feet) of the spread after t hours is r(t)= 200 square root of t, find the area A of the oil slick as a function of the time t. You know that the area of a circle is A=pi*r^2. You're ...
October 3, 2006

Pre-Calculus
The surface ares S (in square meters) of a hot air ballon is given by s(r)=4 pi r^2 where r is radius of balloon (in meters). If the radius r is increasing with time (in seconds) according to the formula r(t) = 2/3t^3, t is greater than or equal to 0, find the surface area S ...
October 3, 2006

Pre-Calculus
The monthly revenue acheived by selling x boxes of candy is calculated to be x(5-0.05x)dollars. The wholesale cost of each box of candy is $1.50. How many boxes must be sold each month to achieve a profit of at least $60. Can someone please let me know how to set up this ...
September 19, 2006

Math
the answer is 70 because it is a multiple of both 2 and 7, it is less than 100 but larger then 50, and it is the product of 3 primes 2,5, and 7
September 12, 2006

science
One of the five charateristics of living things is being able to reproduce. Do all living things have to have all charateristics? Mules are living things and most are sterile. (I have heard of a few cases where a mule has given birth.) What about women who are sterile, they ...
August 24, 2006

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