Saturday
February 6, 2016

# Posts by LEA

Total # Posts: 218

Bio
Why were plants helpful in the early development of land? What is the one most important resource plants that moved to land had to develop a means of obtaining?
January 9, 2016

Physics
1) Design a gear system using 12, 34 and 36 teeth gears that achieve a gear ratio of 13.5:1 and has the top and bottom gear spinning in opposite directions. 2) For a pulley system with 8 supporting strands, how far would you have to pull the rope to lift a 125 kg object 1.0 ...
January 5, 2016

Physics
For a pulley system with 8 supporting strands, how far would you have to pull the rope to lift a 125 kg object 1.0 meters off the ground? What if the pulley system were only 80% efficient?
January 5, 2016

Science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere Chromosphere*************** Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar system? Hydrogen and...
November 7, 2015

Social studies
Against what country was the atomic bomb used? A)Japan B)France C)Europe D)Russia
October 31, 2015

Math 10
Express as sum or difference of logarithm log of x(3x-5) to the base of 4
September 9, 2015

Math
what is the lcm of 4,6,18
August 31, 2015

Physics
A 50 kg ice hockey player standing on a frictionless ice surface throws a ball, mass of 5.0 kg horizontally with a speed of 3.0 m/s. With what speed will the player recoil? • What formula/s should I use?
August 31, 2015

Social Studies
Thank you
May 13, 2015

Social Studies
Which description characterizes volcanic islands and not coral atolls? A. Good soil for farming B. Islands are made of tiny skeletons C. Danger of flooding from raising ocean levels D. Sea salt in soil I don't know What was a likely motivation to send colonists to ...
May 13, 2015

math
Suppose sin x =4/5 , 0<x<pi/2 and cos y = -1/2, pi/2 <y< pi evaluate cos (x-y)
January 22, 2015

chemistry
may i ask where did the 1.0 g/mL go?
January 6, 2015

Math
Find all solutions to the equation 3sqrt(3-x)=-3/2. The 3 is the small number outside of the sqrt.
December 4, 2014

math
350 student in the school, 3 boys for every 2 girls how boys are there?
September 21, 2014

physics
a bullet is fired horizontally from the top of a cliff that is 30m above a long lake. if the horizontal speed of the bullet is 600 m/s, how far from the bottom of the cliff does the bullet strike the surface of the lake ? with what velocity will the bullet strike the lake'...
September 13, 2014

Geology
Question: A tectonic plate that is being subducted along much of its boundary tends to move _________ a tectonic plate that is not being subducted. a) slower than b) faster than c) the same rate as d) over
September 8, 2014

Socials urgent
I need to know the following for these places: Port Moody, Chinatown, Fort Langley (all in british columbia canada) 1. what the area was intially used for (history in late 1800s) 2. what the area is used for today (popular tourist attraction or activites) 3. any brief ...
June 11, 2014

mth-stat-help-plz
In conducting a hypothesis test for the difference in two population means where the standard deviations are known and the null hypothesis is: o H : uA - uB ≥ 0 What is the p-value assuming that the test statistic has been found to be z = 2.52? A) 0.0059 B) 0....
December 9, 2013

math-true/false
9.)The actual weight of 2-pound sacks of salted peanuts is found to be normally distributed with a mean equal to 2.04 pounds and a standard deviation of 0.25 pounds. Given this information, the probability of a sack weighing more than 2.40 pounds is 0.4251. **TRUE OR FALSE...
December 9, 2013

math
Consider the following hypothesis statement using alpha = .05, and data from two independent samples: Ho: µ1 - µ2 = 0 Ha: µ1 - µ2 not equal to 0 X1 = 237, X2 = 218 ¬1 = 54, ¬2 = 63 n1 = 42, n2 = 35 a) Calculate the appropriate test ...
November 29, 2013

MTH- STAT 201
Can someone please help how to solve this I keep getting the wrong answer so I am now freaking out and clueless 23) The following data show the average retirement ages for a random sample of workers in Boscov’s and a random sample of workers in ShopRite. Boscov’s: ...
November 29, 2013

math-stupid stat
A manufacturing firm is planning the initial public offering of its stock in order to raise sufficient capital to finance a new plant. With current earnings of \$1.61 a share, the firm and its underwriters are contemplating an offering price of \$21, or about 13 times earnings. ...
November 21, 2013

MATH-STAT
Cinemark Theaters knows that a certain hit movie ran an average of 84 days in each city, and the corresponding standard deviation was 10 days. The manager of the southeastern part of Dallas was interested in comparing the movie’s popularity in his region with that in all ...
November 21, 2013

math- stat 201
I got 1.66667 so we should hire a new consultant?
November 21, 2013

math- stat 201
A firm hires a pool of financial consultants to discuss portfolio recommendations with its clients. The CEO believes that another financial consultant should be hired if the average phone consultation exceeds 350 seconds. A random sample of 100 phone calls revealed a mean of ...
November 21, 2013

statistics 201
A firm hires a pool of financial consultants to discuss portfolio recommendations with its clients. The CEO believes that another financial consultant should be hired if the average phone consultation exceeds 350 seconds. A random sample of 100 phone calls revealed a mean of ...
November 21, 2013

History
Who financed the Middle, the South and the New England colonies?
October 14, 2013

Anatomy
It consists of a core of titin, forming a strand that continues across the I band to the Z line on that side
September 25, 2013

U.S.History
How are Primeval and Saga related to U.S. history. Also what does Saga mean?
September 20, 2013

To MS SUE
September 19, 2013

Square root**
September 19, 2013

Please check my answers on the following questions Simplify: (X^6)^1/2 = x^3 1000000^1/6 I don't know this one (64n^12)^-1/6 = 1/0.5n^2 (9n^4)^1/2. = 3n^2 36^3/2 = my answer is 2 in the index of the aware root of 36^3 343^-4/3 I don't know this one Thanks
September 19, 2013

chemistry
Express the following numbers in scientific notation. (c) 0.9589 (d) 745 (e) 74100 (f) 0.002031
September 15, 2013

chemistry
A 18.2 g sample of an unknown compound contains 0.7 g of oxygen. What is the percent by mass of oxygen in the compound?
September 15, 2013

math
find the number of 8 units to the right of -3
June 15, 2013

chemistry - thank you:)
What volume of H2SO4 0.04 M is required to completely neutralize 200 mL of Al(OH)3 0.02M?
May 13, 2013

CHEMISTRY HELP!!!
A silver ring is dropped in a solution of Pb(NO3)2 for a certain period. Will you find it intact? Explain.
May 11, 2013

chemistry
Can a solution of CrCl3 be stored in an aluminum container?
May 11, 2013

algebra 2
Students at a high school all took the same English test. The scores are approximately normally distributed with a mean of 77 and a standard deviation of 9. If 2500 students took the test, approximately how many scored above 86 or below 68%?
April 8, 2013

algebra 2
In a high school, 35% of the 3500 students participate in sports. The school board is proposing a participation fee to help with costs. To get student opinion, the school board randomly selects a committee of 6 students to join a discussion of the proposal. That is the ...
April 8, 2013

Albebra 2
A school wants to determine the average time it takes students to get to school. Every student coming off the bus is surveyed. What is the sampling method used? Does the sample have a bias?
April 8, 2013

algebra 2
In a cooler there are 8 bottles of grape juice and 12 bottles of orange juice. There are also 6 blueberry yogurts and 9 strawberry yogurts. If you grab a bottle of juice and a yogurt without looking, what is the probability that you get a grape juice and a blueberry yogurt?
April 8, 2013

algebra2
What are the mean, variance and standard deviation of these values? 62,41,54,60,49,58.
April 8, 2013

Algebra 2
A teacher is choosing 4 students from a class of 30 to represent the class at a science fair. In how many ways can the teacher choose the students?
April 8, 2013

Algebra 2
I keep coming up with 1 as the answer and thats not a choice?
March 13, 2013

Algebra 2
Susan keeps track of the number of tickets sold for each play presented at the community theater. Within how many standard deviations of th mean do all the values fall? 135, 71, 69, 80, 158, 152, 161, 96, 122, 118, 87, 85. 3 4 5 2
March 13, 2013

Algebra 2
What are the mean, variance, and standard deviation of these values? Round to the nearest 10th. 92, 97, 53, 90, 95, 98
March 13, 2013

algebra
Simplify 3x(x^2 + 6x - 8)
March 7, 2013

algebra
Thanks!
March 7, 2013

algebra
That's just the way the question was asked?
March 7, 2013

algebra
multiply using FOIL and identify values of a, b, & c. (5x +5)(6x - 8)
March 7, 2013

algebra
Simplify (uv)0 ______ (u3 v)2
March 7, 2013

Algebra
Simplify (x^-6)-3
March 7, 2013

Algebra
Simplify 6x - x^2 (x-3)
March 7, 2013

Algebra
Simplify (x-7)( x+7)
March 7, 2013

algebra 2
Can you find the error for me in this equation, find the explicit formula, evaluate the formula for n? I think the error is in the a2-a1 formula.and the -62.50. I know the pattern is 62.50 paid per month. Your uncle loaned you some money and did not charge interest. The amount...
February 21, 2013

algebra 2
what is the 6th term of the geometric sequence 2000, 800, 320,..../
February 20, 2013

algebra 2
Your uncle loaned you some money and did not charge interest. The amount you owe him at the end of each of the first 5 months is \$937.50, \$875.00, \$760.00, and \$687.00. If the pattern continues, how much will you still owe him at the end of one year?
February 20, 2013

Albebra 2
Are these correct? a1=(-3x1)2 +4=13 a2=(-3x2)2+4-40 a3=(-3x3)2+4=85 a4=(-3x4)2+4=148 a5=(-3x4)2+4=229 a6=(-3x4)2+4=328 The first six terms of the sequence are 13, 40, 85, 148, 229, 328 I keep coming up with these answers but there is suppose to be an error somewhere.
February 18, 2013

Algebra 2
What is a recursive definition for the sequence 3, 5, 9, 17, 33..... My answer was adding muliple of numbers, is this correct?
February 18, 2013

Algebra 2
Got it, thanks!
February 18, 2013

Algebra 2
What are the first 6 terms of the sequence with the explicit formula an=-3n2+4?
February 18, 2013

Analytic Geometry
Find the equation of the circle touching the lines x+2y=4, x+2y=2 and y=2x-5 Please I need help, its for my homework
January 31, 2013

Analytic Geometry
Find the equation of the circle with radius sqrt2 tangent to the line x+y=3 and having its center on the line y=4x
January 29, 2013

Analytic Geometry
Find the equation of a circle passing through (-1,6) and tangent to the lines x-2y+8=0 and 2x+y+6=0. Please I really need your help. I just do not know what to do.
January 28, 2013

Analytic Geometry
Find the equation of a circle passing through (3,7) and tangent to the line x-3y+8=0. Please, How do I solve this? Help me
January 26, 2013

Analytic Geometry
Find the equation of a circle passing through (3,7) and tangent to the line x-3y+8=0. Please, How do I solve this? Help me
January 26, 2013

Analytic Geometry
Find the equation of a circle passing through (3,7) and tangent to the lines x-3y+8=0 and y=3x. Please Help me solve this. Explain it to me slowly cause I am not really good with this
January 26, 2013

Analytic Geometry
Are you all using directed distance?
January 25, 2013

Biology
What is the probability that any two humans with the same parents will be identical(other than identical twins)for each parent's gametes?
October 17, 2012

Language Arts
What does it mean to write a paper in APA format?
October 17, 2012

chemistry
Water has a bent molecular shape, but what if water had a linear molecular shape would the molecule be polar or non-polar? Explain This is what I know pls correct me if I'm wrong. It would be nonpolar because it is symmetric so the charge is equally distributed.
October 5, 2012

chemistry
The formulas for ethane, ethene and ethyne are C2H6, C2H4, and C2H2 respectively. Rank this chemicals 1,2,3 (highest)in terms of strength of IMF and explain the structures of the three molecules. I rank these three based on the bond length so I got C2H2, C2H4, C2H6. I know the...
October 5, 2012

chemistry
what is the complete ionic equation for the double displacement of CuNO3(aq)+K2S(aq)
October 4, 2012

chemistry
Why is gas a chemical reaction not detectable by sight? Explain? my answer is because the atoms or molecules of matter in the gaseous state move freely among each other, and are, in most instances, packed more loosely than the molecules of the same substance in the solid or ...
October 4, 2012

Physics
A man on a 2m high ladder throws a ball in the air with an initial velocity of 22m/s. If the ball is not caught by the man and instead hits the ground, how long was it in the air and how high did it go?
September 30, 2012

arithmetic
lim x->0 (e^x^2 - 1)/(square root(1+sinx)- square root(cosx))
September 4, 2012

world geography
May 30, 2012

world geography
May 30, 2012

world geography
May 30, 2012

Physics
1.64e12
May 13, 2012

stats
Test the significance of the correlation coefficient r at a=0.05 for the data below. X values 59, 65, 73, 80, 89 Y values 97, 102, 110, 117, 125 A) Accept p=0 because 60.81<3.18 B) Reject p=0 because 61.13>3.18 C) Accept p=0 because 61.13<2.78 D) Reject p=0 because 60...
May 7, 2012

Statistics
a random group of seniors was selected from a university and asked about their plans for the following year. The school advising office claims that 50% of the students plan to work, 25% of the students plan to continue in school, and 25% of the students plan to take some time ...
May 7, 2012

statistics
A random group of customers at a fast food chain were asked whether they preferred hamburgers, chicken sandwiches, or fish sandwiches. The restaurant's marketing department claims that 40% of the customers prefer hamburgers, 46% of the customers prefer chicken sandwiches, ...
May 7, 2012

Statistics
Test the significance of the correlation coefficient r at a=0.05 for the data below. X values 59, 65, 73, 80, 89 Y values 97, 102, 110, 117, 125 A) Accept p=0 because 60.81<3.18 B) Reject p=0 because 61.13>3.18 C) Accept p=0 because 61.13<2.78 D) Reject p=0 because 60...
May 7, 2012

Statistics
The table list the sugar content of two types of apples from three different orchards. At a=0.05, test the claim that the sugar content of the apples and the orchard where they were grown are not related. Sugar Content------Orchard 1----- Orchard 2------Orchard 3 Apple type1...
May 7, 2012

Math
How do I simplify this? :l 4(x+y)]/(5x^2y^3) ÷ (-2x-2y)/10
April 27, 2012

math
The measure of one angle is 30 degrees less than one-third the measure of its supplement. Find the two angles.
March 14, 2012

math
The measure of one angle is 15 degrees more than half the measure of its complement. Find the measure of the two angles.
March 14, 2012

math
The average airspeed of a single-engine aircraft is 150 milesper hour. If the aircraft flew the same distance in two hours with the wind as it flew in 3 hours against the wind, what was the effect of the wind on the plane? What are the equations? What is wind speed?
March 14, 2012

math
A boat is rowed down a river a distance of 16 miles in 2 hours and it is rowed upstream the same distance in 8 hours. Let r represent the rate of the boat in still water in miles per hour, and let c represent the rate of the stream in miles per hour. Write the equation. What ...
March 14, 2012

math
The length of a rectangle is 4 times the width. The perimeter is 50cm. Find the length and width. Write the equations. What is the length and width?
March 14, 2012

math
A rectangle has a length of 4x and a width of 4x-2. Its perimeter is 12 inches. Find the length and width. Write the equations. What is the length and width?
March 14, 2012

math
Eighty people are separated into 2 groups. The first group is 8 less than 3 times as large as the second. Find the number of people in each group.
March 14, 2012

algebra 2
The larger of two numbers in 8 times the smaller. The difference between them is 42. Find the numbers. Write the equations. Find the numbers
March 14, 2012

Chemistry
What compounds can be formed by the reaction of K2SO4 and BaCI2?
February 27, 2012

Precalculus
1.Solve 5^(2x) -4(5^x)=12 2. Solve Log[8](log[8]x)=0
January 30, 2012

Math
Verify if this is the correct form please. Given the parent function f(x)=log[10]x, state the equation of the function that results from a vertical stretch by a factor of 2/5, a horizontal stretch by a factor of 3/4, a reflection in the y-axis, a horizontal translation 2 units...
January 30, 2012

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