Friday
October 21, 2016

Posts by joel

Total # Posts: 300

algebra
Select the set of equations that represents the following situation: Mary invested one amount at 7% simple interest, and a second amount at 5% interest, earning \$29.80 in one year. If she had switched the amounts, she would have earned \$35.00. What were the two amounts? (...
February 22, 2011

algebra
Select the set of equations that represents the following situation: The cost of eleven CDs and twelve DVDs is \$150.62; and the cost of one DVDs and twelve CDs is \$116.07. How much do a CD and a DVD cost? (Points : 3) 11x + 12y = 150.62; 12x + 1y = 116.07 11x • 12y = 150....
February 22, 2011

algebra
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -3x + 4y = -19.5 -3x + y = -10.5
February 22, 2011

algebra
Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this. x + 10y = 41 x + 9y = 37
February 22, 2011

algebra
Select the set of equations that represents the following situation: Mary invested one amount at 7% simple interest, and a second amount at 5% interest, earning \$29.80 in one year. If she had switched the amounts, she would have earned \$35.00. What were the two amounts?
February 22, 2011

Algebra
Cody’s motorboat took 3 hr to make a trip downstream with a 6-mph current. The return trip against the same current took 5 hr. Find the speed of the boat in still water
February 22, 2011

intermediate algebra
Select the set of equations that represents the following situation: Mike invested \$706 for one year. He invested part of it at 5% and the rest at 3%. At the end of the year he earned \$28.00 in interest. How much did Mike invest at each rate of interest?
February 21, 2011

Physics
A Force,F=10N,applied at an angle of 37 degree above the horizontal,moves a crate a distance of 5m along a rough horizontal surface.A frictional force of 5N opposes the motion.what is the change in kinetic energy?
February 18, 2011

statistics
the correlation between two random variables X and Y is p=-0.75.it is given that X=1,2or3 with equal probability of 1/3 and Y=-1,-2or-3 with equal probability of 1/3.the covariance is equal to?i need help.i have been struggling to get the answer>
February 11, 2011

Physics
A 3kg mass moving initially to the right along the x axis with a speed of 8m/s makes a perfectly inelastic collision with a 5kg mass initially at rest at the origin.what fraction of the initial kinetic energy of the system is lost in the collision.what formula must i use.
February 2, 2011

Physics
A 3kg mass moving initially to the right along the x axis with a speed of 8m/s makes a perfectly inelastic collision with a 5kg mass initially at rest at the origin.what fraction of the initial kinetic energy of the system is lost in the collision.what formula must i use.
February 2, 2011

Pre-Algebra
Thank you, Ms. Sue!
January 24, 2011

Pre-Algebra
If 4 liters of motor oil cost \$3.88, what is the price for 1 liter? I'm supposed yo set up proportions. This is how I set it up: \$3.88/4 liters • 1 liter/p p= the price for 1 liter Please tell me if I set it up right and how to solve.
January 24, 2011

Maths
is 10*10exponent -3 a scientific notation?
January 17, 2011

Physics
Two points charges of 2uC and -6uC are located at the position(0.0)m and (0.3)m.Calculate the total electrical potential at the point (4.0)m due these two charges.
January 17, 2011

Physics
hi Esskay,can u help me with the answer
January 17, 2011

Physics
A proton is released from rest in a uniform electric field which is directed along the x axis and of magnitude E=2*10exponent5 V/m.The proton undergoes a displacement from point A at the origin to point B at x=0.2m.What is the change in the potential energy of the proton ...
January 17, 2011

Physics
if a ball is thrown straight upward and is caught 5s after being thrown,how fast must it have been going when it left the person s hand?help
January 17, 2011

physics
if a ball is thrown vertically upward and is caught 5 seconds,how fast must have been going when it left the person s hand?help
January 14, 2011

math
Write a missing addend addition sentence to help solve 78-49.explain how you would use it.
January 2, 2011

PHYSICS
They both experience the same impact force however the fly will experience a greater acceleration
November 30, 2010

Phys
V = (f)* (wavelength) 200m/s = 100hz * Wavelength solve for wavelength then multiply by 3 dont forget to use the units for each variable like he gave us in class i.e. frequency = vibration/time wavelength = distance/vibration velocity = distance/time
November 30, 2010

Physics
I know for sure that the answer is not B or C since the volume increases and the temperature increases, however i am having a hard time understanding the definition of an adiabatic process and how to determine if there is any heat lost to the atmosphere. I am pretty sure the ...
November 30, 2010

Physics
A gas is taken though a single process in which its volume decreases by .25 m^3 as the temp of the gas rises 2deg C. Which of the following people are more likely to have reached the correct conclusion? a. Bob Identifies this process as adiabatic b. Jill identifies this ...
November 30, 2010

History
A more unified African American culture began to emerge in the early decades of the nineteenth century because? the Gullah dialect spread to the new slave territories in the Old Southwest. the rapid transfer of slaves from other regions into the Lower Mississippi Valley ...
November 29, 2010

English
1) lessons, is better 2) is good 3) 2 lessons/2 more hours of lesson 4) good 5) i go to the bathroom where i wash and dress myself (not dressed myself) 6)i get ready for school 7) good 8) good 9) computer lab and fine
November 14, 2010

algebra
Select the set of equations that represents the following situation: The cost of eleven CDs and twelve DVDs is \$150.62; and the cost of one DVDs and twelve CDs is \$116.07. How much do a CD and a DVD cost? (Points : 3) 11x + 12y = 150.62; 12x + 1y = 116.07 11x • 12y = 150....
November 13, 2010

physics
If there are three forces acting on an object, one straight up, one up at an angle to the left (angle unknown) and one up at an angle to the right what direction is the combined force? Is it possible for the combined force of those three forces to be down?
November 8, 2010

Math
Two sides of a triangle have the same length. The third side measures 4 meters less than twice the common length . The perimeter of the triangle is 16 meters. What are the lengths of the three sides?
November 7, 2010

An ice cube that is 3 cm on each side is melting at a rate of 2 cm cubed per minute. how fast is the length of the side decreasing?
October 21, 2010

Science
that doesnt help me though. i need to know what Describe the role of gravity as the force that governs the movement of the solar system and the universe means.
September 27, 2010

Science
"Describe the role of gravity as the force that governs the movement of the solar system and the universe." I don't get it.
September 27, 2010

math
Tyrell says \$750 is about \$800.Sara says \$750 is about \$700.who is correct?explain.
September 22, 2010

math
in which number does 4 have the greatest value 9499 4391 2240 1944
September 21, 2010

Physics
This should say Physics-Typo error
September 19, 2010

Ohysics
An airplane flying at 120km/h due west moves into a region where the wind is blowing at 40km/h due east. If the plane's original vecotr velocity is Vplane, what is the expression for the plane's resulting velocity in terms of Vplane. a. 1/3 >Vplane b. 2/3>Vplane ...
September 19, 2010

Physics
A lightning bug flies at a velocity of 0.25m/s due east toward another lightning bug seen off in the distance. A light breeze blows from the east on the bug at a velocity of 0.25m/s. What is the resultant velocity of the lightning bug? Please direct me to even start-I'm ...
September 15, 2010

Math
Help! Toshiro Hashimoto invested some money at 4.5% simple interest and \$1000 more than four times the amount at 6%. His total annual income for one year from interest on the two investments was \$801. How much did he invest at each rate?
September 15, 2010

Language Arts
I need the complete predicate in this sentence? Ida B. Wells was born into slavery in 1862 in Holly Springs, Mississippi.
September 9, 2010

English
Could someone help with the main idea of this paragraph? Please and thank you Old Man Warner snorted. 'Pack of crazy fools," he said. "Listening to the young folks, nothing's good enough for them. Next thing you know, they'll be wanting to go back to ...
September 8, 2010

Math
Thank you so much
September 7, 2010

Math
Help-I just started Algebra II and I'm lost. What is the solution of 10 = absolute value of 7-3x. Please show steps so I can understand
September 7, 2010

Physics
I just need to clarify something in my mind- I look at a graph and the position changes from 3 to 8 over a ten second interval, to find total displacement, I just take 8-3 would equal 5 for total displacement, correct? I don't need to bother with the time interval, correct...
September 6, 2010

Chemistry
What is the pH of a 1.0E-8 M solution of HCl? Please note that you cannot simply add the contribution of H+ ions from the autoproteolysis of water and the contribution from the dissociation of HCl. You will need to use the quadratic equation to solve this problem and report ...
September 3, 2010

Chemistry
What is the pH (to three figures) of a 0.1 M solution of sodium acetate given that the acid dissociation constant (Ka) of acetic acid is 1.8E-5? Hint: I keep getting 2.87 but its wrong.
September 3, 2010

Math
y=3x-3.5
June 10, 2010

Global History
ok thanks jimmy and Ms.Sue
April 9, 2010

trig
what is the tan of 25 degrees and 01 minute
April 7, 2010

English
In many works of literature, an individual's encounter with death or destruction ultimately leads to the individual's affirmation of the dignity and worth of human life. What does this quote means and how does this quote relates to Hamlet by William Shakespeare. I have...
April 6, 2010

s.s.
it says they slowly decliened
February 21, 2010

s.s.
history idk
February 21, 2010

s.s.
Axum's conversion to Christianity a. beneficial b. a drawback c. first a drawback then beneficial d. first beneficial then a drawback
February 21, 2010

algebra
for x-y=3 add y to both sides then subtract three from both sides. For x+4y=9 subtract x from both sides then divide everything by 4.
February 1, 2010

Can't understand trig problem
An airplane left an airport and flew east 174 miles. Then it turned northward flying along a bearing of N22E. When it was 254 miles from the airport, there was an engine problem and it turned back to take the shortest route possible back to the airport. Find theta, the angle ...
February 1, 2010

Geography
What climate does the United States not have?
January 21, 2010

physics
There's a magic ring in a sealed paint can at the bottom of a frozen pond in the middle of a bog. YOu must get the ring via a plan which: gets you and equipment you need across without sinking, cross the frozen pond without breaking through the ice, lift the paint can out ...
January 19, 2010

algebra 2
X + 2 = - 2
January 16, 2010

algebra 2
X+2 = 3 - 5
January 16, 2010

Precalculus
If sinu = -5/7 and pie<u<3pie/2 find 2u Does anyone know the answer to this (not the steps for solving I know that my answer just keeps coming out funny)
January 13, 2010

Precalculus
what are the zeroes of the graph 2sin(squared)x + cosx-3 = 0
January 13, 2010

american government
What are the differences and similarities between baltimore country council and the Maryland general assembly
January 13, 2010

precal desperate
Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a+B)
January 13, 2010

precalculus
Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a+B)
January 12, 2010

algebra
Which is greater? 7 3/4 or 7 2/3
January 6, 2010

math
You got the answer pretty much right but a more exact answer would be 8/3 or 2 2/3. Because in decimal form it is actually 2.66666667
November 29, 2009

Calculus - Related Rates
12mm^2/hr = r2PI dr/dt So 12/2PIr mm^2/hr = dr/dt which is the same as dr/dt = 6/PIr mm^2/hr Why'd you originally say dr/dt= 12/(2r) mm/hr
November 29, 2009

Calculus - Related Rates
I'm sorry, I'm not following what you did. I get that we know dx/dt = 12mm^2/hr and we want to find dr/dt but I don't know how you linked them together as a function of r. Maybe show me more steps and how you got the derivative dr/dt. Thanks
November 29, 2009

Calculus - Related Rates
Bacteria are growing in a circular colony one bacterium thick. The bacteria are growing at a constant rate, thus making the area of the colony increase at a constant rate of 12 mm sq. per hour. Find an equation expressing the rate of change of the radius as a function of the ...
November 29, 2009

science
how do geologists determine the texture of a rock
October 15, 2009

what is gnama artea it means Kings must follow laws too.
September 21, 2009

com130
. In what situations might an individual writing process be preferable?
June 24, 2009

calculus
find the integral of square root of 1+x^3 dx or sqrt(1+ x^3)dx
February 23, 2009

calculus help
find the integral of square root of 1+x^3 dx or sqrt(1+ x^3)dx
February 23, 2009

evaluate: integration of x^2 (square root of (1-2x^3))dx
February 19, 2009

calculus
evaluate: integration of x^2 (square root of (1-2x^3))dx
February 19, 2009

Government
How has the clean air act increased the power of the federal government relative to the power of the state governments?
February 13, 2009

Macro Economics
Can it be considered acceptable to policy makers to have about 7 million people classified as unemployed in the U.S.? Explain.
September 30, 2008

Macro Economics
I meant frictional unemployment rate
September 29, 2008

Macro Economics
Does anyone know how to calculate the frictional rate of employment...given the following information... The structural unemployment rate of 2.8%, actual unemployment rate of 7% and cyclical unemployment is 2.0% I just need to know the formula to use??
September 29, 2008

beginning chemistry
calculate the volume of 750.0g of gold.
March 11, 2008

need to draw data sets to find the mean. I know how to use this putting the numbers in order from least to greatest, but how do I draw this?
September 20, 2007

Algebra
Thank you so much! :)
August 24, 2007

Algebra
I still don't get it! My brain is burnt right now.
August 24, 2007

Algebra
Gabe lives fifteen miles from school and the bus stops seven times at three minutes each between his house and school. The bus arrives at his house at 7:30. Gabe's friend Aaron lives 8 miles from school and the bus stops four times at 2 minutes each between his house and ...
August 24, 2007

Algebra
Ann sells apples and Beth sells oranges. Today, half the number of apples than Ann sold was fifteen less than thrice as much the number of oranges that Beth sold. I just want it to know; how do I convert it into an algebraic expression or equation? Is confusing and I don't...
August 21, 2007

Algebra
so it will be like this? 1/2 A= 3B - 15
August 20, 2007

Algebra
Thank you. I can work on it now. :)
August 20, 2007

Algebra
Ann sells apples and Beth sells oranges. Today, half the number of apples than Ann sold was fifteen less than thrice as much the number of oranges that Beth sold. Can someone explain to me what this means and how to do it pretty please? I really need help on this one. Can ...
August 20, 2007

Algebra
6x²y³ + 9x²y³ 15x²y³ ------------- = ---------- 3x²y² 3x²y² = (15/3) (x²/x²) (y³/y²) = 5y Just want it to know if is correct, but don't y³ + y³ = 2y³? I'm confused now. Can someone ...
August 15, 2007

fractions
Jacob is making a recipe and requires 3/8 cups of water for stew. He needs to double the recipe . Find your answer in simplest form
May 23, 2007

CHemistry
Which one of the following is expected to be the strongest Lewis acid? Fe, Fe+, Fe2+, Fe3+ Which do you think would accept electrons the easier? Fe(s) or Fe^+? Do that same kind of logic on the others one by one.
April 27, 2007

Chemistry
If an equal number of moles of the weak acid HOCN and the strong base KOH are added to water, the resulting solution will be acidic, basic or neutral? There is a complicated answer and a sensible answer. Both arrive at the same answer. But here is the logic for the sensible--I...
April 27, 2007

Algebra HW
Find the vertex of the function y = –x2 + 2x + 8. it shows me different points as the answer. Im not sure how to find that point. Here are the points: (1,7) or (1,9) or (4,-2) or (-1,-9) Answered in a previous post. Here it is again: Here's a quick way to find the ...
March 20, 2007

Albebra
Find the vertex of the function y = –x2 + 2x + 8. It is where the derivative -2x + 2 = 0. Since you probably haven't learned about derivatives, do it this way: Rewrite is as -x^2 +2x +8 = -(x-1)^2 + 7 Now look at the form of the formula on the right. It can never be ...
March 20, 2007

Algebra
Which expression simplifies to –1? A. 7 + w B. x - 2 C. 3 - y ------ ----- ----- w + 7 x + 2 y - 3 D. 4 + z ----- -4 + z A
March 20, 2007

Algebra 1
how do i graph x + y = 1 put y on one side y=-x+1 im doing an online test and its asking me to find the equation that matches the graph. But im not sure how to figure it out. well the graph should have a negative slope with 1 as y-intercept look for a graph with those tips. it...
March 20, 2007

Social Studies
What is Nunavut's nickname and motto? Scroll down to the weather section of this site for Nunavut's nickname. (Broken Link Removed) This site has its motto. http://homeschooling.about.com/library/blcanumotto.htm
February 8, 2007

microeconomics
Question 4. (50 points) In an auction in the market for wholesale electricity, producers of electricity submit bids for each generator that they operate. The bid is the minimum price the operator of the generator is willing to accept for before it will turn it on to supply ...
September 22, 2006

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