# Laurie

Newest questions and responses by Laurie-
## Physics

The average wind speed at a height of 80m over the North Sea is estimated to be about 9 m/s. Norway plans to build a 10-MW wind turbine in the North Sea, which will have blades of diameter 145m producing an average of 3 MW of power. Calculate the

*asked on August 24, 2018* -
## Physics

The human eye can detect light of wavelengths up to 400 nm. Calculate the temperature at which a heated piece of metal would start to emit visible light (start to glow red). I used Wien's law and got 7,250 K, but I'm not sure if it's correct since metal

*asked on August 24, 2018* -
## Algebra

Let "n" be a positive integer. How many points (x,y) in the coordinate plane are there such that x and y are integers and 0

*asked on October 25, 2017* -
## Algebra

Let "n" be a positive integer. How many points (x,y) in the coordinate plane are there such that x and y are integers and 0

*asked on October 24, 2017* -
## Math

A farmer has 1,000 yards of fence to use to make a rectangular corral. Let x be the length of the corral. Why does A(x)=x(500-x) represent this situation? Where did the 500 come from?

*asked on October 13, 2017* -
## Math

If a light bulb that burns 3 hours a day lasts for 22.8 years, then how long will a light bulb that burns for 7 hours a day last?

*asked on September 13, 2017* -
## math

A depositor opens a new savings account with $ 8000 at 8 % compounded semiannually. At the beginning of year 3, an additional $6000 is deposited. At the end of four years, what is the balance in the account?

*asked on April 16, 2017* -
## chemisty

if you react 1.20g of copper metal with excess silver nitrate, how many moles of silver metal are produced?

*asked on November 20, 2016* -
## Gaussian Elimination Method

z-d-b=200 z +2b=250 b=150

*asked on October 30, 2016* -
## Math

Find two numbers whose product is 20 and whose quotient is 5

*asked on September 20, 2016* -
## Algebra

The monthly income I, in dollars, from a new product is given by I(t) = 75000 − 55000e^−0.003t where t is the time, in months, since the product was first put on the market. (Round your answers to the nearest dollar amount.) (a) What was the monthly

*asked on May 15, 2016* -
## Math

If a 2-inch pipe will fill a tank in 6 hours, how long will it require for a 3-inch pipe to fill it?

*asked on May 6, 2016* -
## Math

Donations to an annual fundraiser are 15% greater this year than last year. Last year, donations were 10% greater than the year before. The amount raised this year was $10,120. How much was raised 2 years ago?

*asked on April 16, 2016* -
## Math

40 students are in the science club. 45% are girls. New girls enter the club and now the percentage of girls is 56%. How many new girls join the club?

*asked on April 15, 2016* -
## Science

A basketball momentarily changes shape as it bounces off the floor. This is due to balanced forces acting on the ball. True False False?

*asked on February 10, 2016* -
## Technology

1. Which of the following is NOT an example of a objective question? A. multiple choice B. essay** C. true/false D. matching 2. Why is it important to recognize the key word in an essay question? A. It will provide the answer in an essay B. It will show

*asked on February 9, 2016* -
## Algebra 2

I have gotten two different answers to the following problem. Can someone please let me know which answer is correct? (5 - 6)³ + 14 ÷ (2 + 5) = -1 + 14/7 = -1 + 2 = 1 or 1 + 14/7 = 1 + 2 = 3 I think it is 1. Thank you.

*asked on August 10, 2015* -
## algbra 2

Can you let me know if the answer to the following problem is 11 2/3? Thank you 4² + [15 ÷ 9 - 3(2)] = 11 2/3??

*asked on August 10, 2015* -
## Thank You To All of You Who Help

Thank you to all the people that answers questions on this website. It is truly helpful to people like me. I don't know how to respond to those of you that help me, but Thank You!

*asked on August 1, 2015* -
## High school Algebra

For the following example: 5 * 6 - 2 * 4 = 30 - 8 Does this represent the substitution property? I am assuming yes since you are substituting 5*6 for 30 on the other side of the equation. Thank you to those who answer. I was not sure how to send a thank

*asked on August 1, 2015* -
## Algebra II

Can you please help me solve the following problem: 4² + [15 + 9 - 3(2)] Thank you.

*asked on May 29, 2015* -
## algebra

The length of a rectangular piece of steel in a bridge is 4 meters less than triple the width. The perimeter of the piece of steel in a bridge is 4 meters less than triple the width. The perimeter of the piece of steel is 48 meters. Find the length of the

*asked on February 5, 2015* -
## Microeconomics

10. Bob must ship his belongings worth 1,000 to England from Latin America. The prob- ability that a ship sinks and he loses the entire value of his shipment is 0.1. Assume that if one ship sinks it does not affect the probability that the second ship

*asked on October 20, 2014* -
## Math

A car rental company charges $100 for the first 50 miles and $10 for every additional 10 miles. If Gregg traveled 150 miles, how much would he pay?

*asked on October 1, 2014* -
## math

A car rental company charges $100 for the first 50 miles and $10 for every additional 10 miles. If Gregg traveled 150 miles, how much would he pay? I know the answer intuitively is $200, but how do I set up this equation

*asked on October 1, 2014* -
## English

My father was a hard working man but didn't earn much money. Is this sentence correctly punctuated?

*asked on September 6, 2014* -
## Calculus

Find the area of the region enclosed by the parabolas y=x^2 and y+2x-x^2

*asked on May 21, 2014* -
## Calculus

2x -------- (x-2)(x+2) using partial fractions That's supposed to be a division sign of some sort

*asked on May 21, 2014* -
## Calculus

xe^x using integration by parts

*asked on May 21, 2014* -
## Physics

1. A car decelerates at -3.8 without skidding when coming to rest on a level road. What would be its deceleration if the road is inclined at 9.3° and the car moves uphill? (Asume the same static friction coefficient and the car is on the verge of

*asked on March 25, 2014* -
## math

How many edges are in K15, the complete graph with 15 vertices

*asked on December 9, 2013* -
## Math

Mr. Thomas spent 1600.00 of his savings on a TV and 2/5 of the remainder on a refrigerator. He had 1/3 of his original amount of savings left. What was Mr. Thomas's original savings?

*asked on November 11, 2013* -
## Biology

What could be a benefit for a plant that can switch between cyclic and non-cyclic electron transport? Think about the products of electron transport and what products are needed for the Calvin Cycle.

*asked on November 1, 2013* -
## Chemistry

Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 6 to n = 1.

*asked on October 10, 2013* -
## Algebra

Multiply: -8(2a+4b-6)

*asked on September 30, 2013* -
## math

is the formula "y=x to the 7th power" an example of a proportional relationship?

*asked on April 30, 2013* -
## t-test

For a single-sample t-test the t(17) = 2.90, p

*asked on March 30, 2013* -
## statistics

Want to find if students who are musicians have higher Iq test scores than the general population. the researcher predicts that playing music is associated with higher IQ scores. the researcher selects a sample of 75 musicians from area and gives them an

*asked on March 30, 2013* -
## Probability

The probability that an individual egg in a carton of eggs is cracked is 0.05. You have picked out a carton of 1 dozen eggs (that’s 12 eggs) at the grocery store. Determine the probability that at most two of the eggs in the carton are cracked

*asked on February 27, 2013* -
## Probabilities Help

The probability that an individual egg in a carton of eggs is cracked is 0.05. You have picked out a carton of 1 dozen eggs (that’s 12 eggs) at the grocery store. Determine the probability that at most two of the eggs in the carton are cracked

*asked on February 27, 2013* -
## Probabilities Help

The probability that an individual egg in a carton of eggs is cracked is 0.05. You have picked out a carton of 1 dozen eggs (that’s 12 eggs) at the grocery store. Determine the probability that at most two of the eggs in the carton are cracked

*asked on February 27, 2013* -
## algebra

Determine the comparable interest rate for a $50,000 loan when the quoted information is 11.4% + 0.5 pt + $300.

*asked on November 24, 2012* -
## Physics

The length of the rod will become exactly half of its original value. The length of the rod remains the same. The length of the rod will decrease. The length of the rod will increase. Wouldn't the length double, thus being answer D?

*asked on October 24, 2012* -
## Physics

The length of the rod will become exactly half of its original value. The length of the rod remains the same. The length of the rod will decrease. The length of the rod will increase. Wouldn't the length double, thus being answer D?

*asked on October 23, 2012* -
## Physics

If a rod is moving at a velocity equal to 1/2 the speed of light parallel to its length, what will a stationary observer observe about its length? The length of the rod will become exactly half of its original value. The length of the rod remains the same.

*asked on October 23, 2012* -
## Physics

The length of the rod will become exactly half of its original value. The length of the rod remains the same. The length of the rod will decrease. The length of the rod will increase. Wouldn't the length double, thus being answer D? No one has answered

*asked on October 22, 2012* -
## physics

If a rod is moving at a velocity equal to 1/2 the speed of light parallel to its length, what will a stationary observer observe about its length? The length of the rod will become exactly half of its original value. The length of the rod remains the same.

*asked on October 22, 2012* -
## math

Find (gof)(-2) f(x)=Squareroot of 4-x; g(x)=1-3x^2

*asked on October 9, 2012* -
## math

What is the domain of the function f(x)=11/Squareroot of 4-x^2 a.(-11,11) b.[-11,11] c. (-2,2) d. [-2,2] What is the range of the function? y=8/Squareroot of 4-x^2 a. [4, infinity) b. (-infinity, 4] c. [8, infinity) d. (-infinity, 12] e. [6, infinity) f.

*asked on October 9, 2012* -
## Math/Algebra

y^2+6+2(y^2+5) My answer is 3y^2+16 (simplifying) but the hawkes learning system won't accept this answer. Am I missing something?

*asked on September 4, 2012* -
## Calculus Voulme

find the volume of the solid generated by revolving the region r bounded by the graphs of the given equations about the y-axis. x^2+y^2=1 x=1 y=1

*asked on July 19, 2012* -
## calculus derivatives

Please confirm: {(5x+2)^4/x^2-3x+1)^3}= 20(5x+2)^2(x^2-3x+1)^3 -3x^2(5x+2)^4 (x^2-3x+1)^2/(x^2-3x+1)^6

*asked on July 19, 2012* -
## algebra

Joey is flying a kite that is attached to a string 200 yards long. The kite is as high as it can go and is flying directly above Joey's house which is 50 yards in front of Joey. How high above the ground is the kite?

*asked on June 27, 2012* -
## Physics

Six light bulbs are connected in parallel to a 9.0 V battery. Each bulb has a resistance of 3.0 ohms. What is the current in each bulb?

*asked on May 15, 2012* -
## math

how to factor w^2r^2-1

*asked on April 3, 2012* -
## Chemistry

A 1 kg block of ice, at 0.0 celcius is added to a picnic cooler. How much heat will the ice remove as it melts into water at 0.0celcius?

*asked on March 22, 2012* -
## Chemistry

What volume of 3.0M sodium hydroxide will be needed to neutralize 2.0 L of 1.0M hydrochloric acid?

*asked on March 21, 2012* -
## Math

Use a radius of 50 and 3 for pi to estimate the area. Then use a radius of 40 and 3 for pi to estimate the area. Is your answer reasonable? Why?

*asked on March 7, 2012* -
## physics

Lasers are used to try to produce controlled fusion reactions. These lasers require brief pulses of energy that are stored in large rooms filled with capacitors. One such room has a capacitance of 64 10-3 F charged to a potential difference of 7 kV. (a)

*asked on January 12, 2012* -
## ETHNIC DIVERSITY

I am trying to locate credible information in regards to the following question. Please note, I do not want the answers, just possible locations that might provide me with a place to start looking as I can not find anything recent. According to research

*asked on November 16, 2011* -
## math

An arcade uses 3 different colored tokens for their game machines. For $20 you can purchase any of the following mixtures of tokens: 14 gold, 20 silver, and 24 bronze; OR, 20 gold, 15 silver, and 19 bronze; OR, 30 gold, 5 silver, and 13 bronze. What is the

*asked on October 28, 2011* -
## Chemistry

Element X has three istotopes, X⁹⁵, X⁹⁶, and X⁹⁸. Element X has an atomic mass of 96.344u. If X-98 has a mass of 98.0001u and an abundance of 19.8%, what are the abundances of X-96 (mass of 95.9988u) and X-95 (mass of 95.0011u)?

*asked on October 8, 2011* -
## Chemistry

Element X has three istotopes, X⁹⁵, X⁹⁶, and X⁹⁸. Element X has an atomic mass of 96.344u. If X-98 has a mass of 98.0001u and an abundance of 19.8%, what are the abundances of X-96 (mass of 95.9988u) and X-95 (mass of 95.0011u)?

*asked on October 8, 2011* -
## Chemistry

Element X has three istotopes, X⁹⁵, X⁹⁶, and X⁹⁸. Element X has an atomic mass of 96.344u. If X-98 has a mass of 98.0001u and an abundance of 19.8%, what are the abundances of X-96 (mass of 95.9988u) and X-95 (mass of 95.0011u)?

*asked on October 8, 2011* -
## Chemistry

Nitrogen effused through a pinhole 1.7times as fast as another gaseous element at the same conditions.Estimate the other element's molar mass. Answer in units of g/mol

*asked on October 2, 2011* -
## Chemistry

A 23 L flask at 254 K and 19 Torr contains nitrogen. What mass of nitrogen is present? Answer in units of g.

*asked on October 2, 2011* -
## calculus

Find equations for the lines that are tangent and normal to the graph of y = sinx + 3 at x = pi

*asked on September 22, 2011* -
## math

Find the volume of a cone with a height of 7.1 m and a circular base whose radius is 3.2 m. Use 3.14 for pi.

*asked on August 8, 2011* -
## English

Can you tell me if I have this correct? I have to identify the adjectives and adverbs in this paragraph. Adjectives: early first huge high several Adverbs: monthly severely monthly ridiculously eventually immediately monthly Like so many people, early in

*asked on May 16, 2011* -
## algebra

F(4)=8 what is the ordered pair

*asked on March 31, 2011* -
## literature

In the book code orange: How do they cure the small pox?

*asked on March 8, 2011* -
## need help

I have this equation y+x=-7 I have to graph my answers to find out what my y is. I have tried everything, and I cannot get my points to cross. Any help would be great.

*asked on December 9, 2010* -
## health HCA/210

I have a 10 to 12 powerpoint slide due next week and I just wanted to get started on it. I need to explain where health insurance began, the purpose of health insurance, and I have to list the advantages and disadvantages to HMOs, Managed care, PPOs, POS,

*asked on December 2, 2010* -
## biology

If a brown-eyed man marries a blue-eyed woman and they have ten children, all brown-eyed, can you be certain that the man is homozygous? If the eleventh child has blue eyes, what will that show you about the father’s genotype?

*asked on November 15, 2010* -
## Marketing

Describe how companies have used marketing data to target wants and need.

*asked on September 26, 2010* -
## agriculture

can you unscramble this. It has to do with farming. dgpcrtouins

*asked on July 24, 2010* -
## Gender

How does the English language that is spoken in the US accomplish that men are portrayed as independent and serious, and are defined and described by activities and accomplishments?

*asked on June 25, 2010* -
## english

select the sentence in which the verb correctly agrees with the subject.

*asked on June 19, 2010* -
## physics

An 9.0 m, 210 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.75, and the ladder makes a 50.0° angle with the ground. How far up the ladder can an 890 N person climb before the ladder

*asked on June 10, 2010* -
## Communication and Listening Studies

When a speaker is 20 years older that the person listening, the listener's ability to listen is affected by what factors?

*asked on June 7, 2010* -
## american government

Consider the phrases “A belief in equal rights has often led to the belief in equality of opportunity;” and “American society does not emphasize equal results or equal rewards;” on p. 141 of the text. Explain these conceptions of equality in 200 to

*asked on April 30, 2010* -
## Data Management gr. 12

I am so confused about correlation equations. I don't know at all how to use them r= W (x-xXy-y)=Sxy __________________ n *the equation doesnt look exactly like this but it is similar, if i can get any help at all that would be great example question:

*asked on April 24, 2010* -
## math

trying to unscrable the letters jeatdcn into a math word

*asked on April 13, 2010* -
## Geometry-PLEASE CHECK ANSWERS!

In isosceles triangle DEF, DE=DF. Which of the following is true? 1)

*asked on February 23, 2010* -
## math

1. 3y=13divided by 2=>y= 2. 6divided by 15=12divided by y =>y= 3. 8 divided by 5 y - 4 = 20 =>y = 4. 3:8= y:32 =>y=

*asked on February 18, 2010* -
## pre calc

13-5e^2x=3

*asked on October 30, 2009* -
## Algebra Help

Solve. Find the exact solution(s). Simplify as much as possible. Show work. 2x^2 + 4x – 1 = 0

*asked on August 3, 2009* -
## Algebra

Solve. Find the exact solution(s). Simplify as much as possible. Show work. 2x^2 + 4x – 1 = 0

*asked on August 3, 2009* -
## Algebra

A contagious disease is infecting residents of a town of 7,300 residents. The number of residents infected t days after the disease has begun is given by the function f(t)=(7300)/1+500e^-0.5 t How many residents are infected with the disease after 6 days?

*asked on August 2, 2009* -
## Algebra

Consider the quadratic function f(x) = – x^2 + 10x – 26. Determine whether there is a maximum or minimum value and find that value.

*asked on July 7, 2009* -
## Algebra

Confused Please Help! Thanks! Let f(x) = 1 – 3x^2. Which of the following is true? Give a brief explanation. A. f is an odd function B. f is an even function C. f is neither odd nor even D. f is both odd and even

*asked on June 24, 2009* -
## Algebra

What is the answer? I came up with C. is this correct? Thanks for the help in advance! f(x)=root sign, and inside that x-2 and g(x)x-7. Which of the following is the domain of the quotient function f/g? A. (-infinity,2] B. (-infinity,7) U (7,infinity) C.

*asked on June 19, 2009* -
## Algebra

f(x)=root sign, and inside that x-2 and g(x)x-7. Which of the following is the domain of the quotient function? A. (-infinity,2] B. (-infinity,7) U (7,infinity) C. [2,7) U (7,infinity) D. (2, infinity)

*asked on June 19, 2009* -
## Algebra

Consider the line with equation 5x – 2y = 10. (a) Find the y-intercept for the given line. (b) Find the slope for a line parallel to the given line. (c) Find the slope for a line perpendicular to the given line.

*asked on June 16, 2009* -
## Algebra

I need to find the quotient function of the following: Given that f(x)=x^2-3 and g(x)=2x+1 find each of the following if it exists: a. (f/g)(-root3) b. (g/f)(-1/2)

*asked on June 14, 2009* -
## Algebra

Given that f(x) = x^2 -3 and g(x) = 2x+1, find each of the follwing, if it exists. Problem 1 (f/g)(-root3) Problem 2 (g/f)(-1/2)

*asked on June 11, 2009* -
## Algebra

Given that f(x) = x^2 -3 and g(x) = 2x+1, find each of the follwing, if it exists. Problem 1 (f/g)(-root3) Problem 2 (g/f)(-1/2)

*asked on June 11, 2009* -
## Algebra

Given that f(x) = x^2 -3 and g(x) = 2x+1, find each of the follwing, if it exists. Problem 1 (f/g)(-root3) Problem 2 (g/f)(-1/2)

*asked on June 11, 2009* -
## Math

What method would be used in financial reporting and would not involve salvage value until the last year of an asset's useful life?

*asked on June 8, 2009* -
## Math

What is the simple interest on a loan of $18,500 at 11% interest for 18 months?

*asked on June 2, 2009*

## Pages

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