Friday

March 27, 2015

March 27, 2015

Total # Posts: 2,922

**physics**

Two boat landings are 6.0 km apart on the same bank of a stream that flows at 2.8 km/h. A motorboat makes the round trip between the two landings in 50 minutes. What is the speed of the boat relative to the water?
*September 14, 2011*

**physics**

At t = 0, a stone is dropped from a cliff above a lake; 2.1 seconds later another stone is thrown downward from the same point with an initial speed of 33 m/s. Both stones hit the water at the same instant. Find the height of the cliff
*September 14, 2011*

**Physics**

it is going directly north
*September 14, 2011*

**Physics**

A plane flies at an airspeed of 242 km/h. A wind is blowing at 72 km/h toward the direction 60° east of north. What is the speed of the plane relative to the ground?
*September 14, 2011*

**Pre-calculus**

how to graph the polynomial function f(x)= -x^4 - 4x^2 by hand. Please Help!!!
*September 14, 2011*

**calculus**

given f(x)=3x-5 , evaluate each of the following f(4) F(x+2) f(-x)
*September 14, 2011*

**Math**

polynomials (2z - 7) (-z + 3)
*September 13, 2011*

**Math**

In December,the average total rainfall in all of the deserts together is 0.89 mm. Explain how to use the figures from the table to write a comparison of the total desert rainfall in August and December.
*September 13, 2011*

**math**

By default, your numerical entry is scored as correct if it is within 1% of the correct answer. A rule of thumb is always to enter at least 3 digits for numerical questions. If the correct answer is 7.08809, which of the following entries would be counted as correct? 7.024 7....
*September 12, 2011*

**geometry**

What is the area of the top of a box that is 14 by 19 cm?
*September 11, 2011*

**Physics**

Two trucks having equal speeds hit their brakes at the same time, but truck has three times the acceleration as truck . Question:If truck B stops in time T, how long (in terms of T) will it take for truck A to stop?
*September 10, 2011*

**psychology**

if there is a positive correlation between the number of computers one possesses and the person’s heart health. what is a third variable (X) that may explain this correlation that is a cause of each one of the two variables. If X goes up the number of computers is likely ...
*September 9, 2011*

**english**

what logic does jack use to assure the others that there are no large beasts on the island?
*September 8, 2011*

**Physics**

An austronaut orbits the Earth in the space shuttle, in one complete orbit, is the magnitude of thr displacement the same as the distance traveled?
*September 8, 2011*

**math**

I need help to justify my square root answer. I think if I could have an example that would help me with the rest of my homework. One of my problems is the square root of 31. thx.
*September 7, 2011*

**physics**

part 1 Simpson drives his car with an average veloc- ity of 47.5 km/h to the east. How long will it take him to drive 137 km on a straight highway? Answer in units of h part 2 How much time would Simpson save by in- creasing his average velocity to 105 km/h to the east? Answer...
*September 6, 2011*

**physics**

How much time would Simpson save by in- creasing his average velocity to 105 km/h to the east? Answer in units of min
*September 6, 2011*

**physics**

It takes you 9.7 min to walk with an average velocity of 2.2 m/s to the north from the bus stop to the museum entrance. How far did you walk? Answer in units of m
*September 6, 2011*

**College statistics**

Do students at various universities differ in how sociable they are? Twenty-five students were randomly selected from each of three universities in a region and were asked to report on the amount of time they spent socializing each day with other students. The result for ...
*September 5, 2011*

**chemistry**

The density of brass is 8,600 kg/m3 or 8.6 g/mL. You have 2 kg of brass. What is the volume?
*September 3, 2011*

**Math**

35x+3150-30x=3420 5x=270 x=270 Row 1 54 seats Row 2 51 seats
*August 31, 2011*

**Math**

At the Sacramento Monarchs home games, Row 1 seats cost $35 each and Row 2 seats cost $30 each. The 105 seats in these rows were sold out for the season. The total receipts for them were $3420. How many of each seat were sold?
*August 31, 2011*

**Algebra 1**

Find the distance between the pair of points (-8,2) (-9,5). Express as a decimal approximation rounded to the nearest hundredth if necessary.
*August 30, 2011*

**Finance**

Johnson Motors’ bonds have 0 years remaining to maturity. Interest is paid annually, the bonds have a $1,000 par value, and the coupon rate is 8 percent. The bonds have a yield to maturity of 9 percent. What is the current market price of these bonds?
*August 30, 2011*

**chemistry**

Which of the following can be classified as a pure compound? Choose one answer. a. iodine, I2 b. sugar, C12H22O11 c. mercury, Hg d. alcohol in water, C2H5OH in H2O e. carbon, C
*August 23, 2011*

**History**

I need help on this also :(
*August 9, 2011*

**Physics**

Hi, I have this question, except I don't know to solve. I think it has something to do with exponential decay and heat flow, but I would like some more help. "3 kg of ice and a 12-pack of ice-cold soda are placed in a 25" x 25" x 40" (outside dimensions...
*August 9, 2011*

**Biochemistry**

Given that ∆Go’ = -15 kJ/mol and k1 = 1.5 X 10-6s-1, calculate k2.
*August 3, 2011*

**Math**

nvm, just solved it.
*August 3, 2011*

**Math**

Solve the equaton by completing the square. 4x^2-8x-3=0
*August 3, 2011*

**physics**

A tennis ball of mass 0.057 kg is served. It strikes the ground with a velocity of 54 m/s (120 mph) at an angle of 21° below the horizontal. Just after the bounce it is moving at 51 m/s at an angle of 19° above the horizontal. If the interaction with the ground lasts 0...
*August 2, 2011*

**physics**

A ceiling fan has four blades, each with a mass of 0.40 kg and a length of 65 cm. Model each blade as a rod connected to the fan axle at one end. When the fan is turned on, it takes 4.45 s for the fan to reach its final angular speed of 2.3 rev/s. What torque was applied to ...
*August 2, 2011*

**physics**

Martin caught a fish and wanted to know how much it weighed, but he didn't have a scale. He did, however, have a stopwatch, a spring, and a 5.50 N weight. He attached the weight to the spring and found that the spring would oscillate 20 times in 64 s. Next he hung the fish...
*August 1, 2011*

**physics**

A car moving at 35 mi/h is stopped by jamming on the brakes and locking the wheels. The car skids 53 ft before coming to rest. How far would the car skid if it were initially moving at 56 mi/h?
*August 1, 2011*

**Math**

Bryan and Kim are painting a house. Working together they can paint a house in three-fifths the time it takes Kim to paint the house working alone. Bryan takes 15 hours to paint the house alone. How long does it take Kim to paint the house working alone?
*August 1, 2011*

**Math / Linear Equations**

I was looking on a website that teaches linear algebra and it had this problem: 3x - 15 _______ =0 2x + 1 And it says the answer is: x = 5 But I don't understand how to get that answer so I hope someone can give me step by step directions for it.
*July 30, 2011*

**math**

Solve: x(x-3)=x-9 Is this correct? Thanks x^2 - 3x = x - 9 x^2 - 3x -x = 9 x^2 - 4x - 9 = 0
*July 28, 2011*

**math**

2a^2+3=7a 2a^2-7a+3=0 2a-1)*(a-3)=0 2a-1=0 or a-3=0 a=1/2 or a=3
*July 28, 2011*

**math**

solve by factoring 2a^2+3=7a Thanks
*July 28, 2011*

**math**

factor out the greatest common factor -36m^2n^3-60mn^4+18m^4n^2
*July 27, 2011*

**MATH!**

is this correct? Completely factor the following expression: 64y^2-49z^2 Is the answer: 128 y-49
*July 27, 2011*

**Can someone help me with this one Please! :)**

factor out the greatest common factor -36m^2n^3-60mn^4+18m^4n^2
*July 27, 2011*

**Is this correct?**

is this correct? Completely factor the following expression: 64y^2-49z^2 Is the answer: 128 y-49
*July 27, 2011*

**Algebra**

factor out the greatest common factor -36m^2n^3-60mn^4+18m^4n^2
*July 26, 2011*

**math**

Interval notation is a method of writing down a set of numbers. Usually, this is used to describe a certain span or group of spans of numbers along a axis, such as an x-axis. However, this notation can be used to describe any group of numbers. For example, consider the set of ...
*July 26, 2011*

**math**

is this correct? Completely factor the following expression: 64y^2-49z^2 Is the answer: 128 y-49
*July 26, 2011*

**Pre cal**

)a function f is defined as f(x) = 3*2^x describe the end behavior of f, please describe in detail how you got the answer and explain your abbreviations.
*July 25, 2011*

**Pre Cal**

ok, thats wahat i thought but wasn't sure.
*July 25, 2011*

**Pre Cal**

what is the big +x? and so the answer is "so for big +x the function looks like just plain old x, a straight line of slope +1" and "then the numerator is positive x^2 and the denominator looks like x so the result is again looks like x, that same straight line ...
*July 25, 2011*

**Pre Cal**

what does it mean when it says describe the end behavior of f and whats that for f(x)=(x^2+x+3)/(x-1) and f(x)= 3*2^x, please explain everything, and if you use --> tell me what that means, cuz i have no clue
*July 25, 2011*

**Math**

what does ---> +or - infinity mean? and what that for f(x)=(x^2+x+3)/(x-1) and f(x)= 3*2^x
*July 25, 2011*

**Math**

what does it mean to describe the end behavior of f in a graph?
*July 25, 2011*

**Pr-Cal/Trig**

Thanks
*July 25, 2011*

**Pr-Cal/Trig**

1)if the graph of f(x)=cotx is transformed by a horizontal shrink of 1/4 and a horizontal shift left pi, the result is the graph of: a) g(x)= cot[1/4(x-pi)] b) g(x)=cot[1/4(x+pi)] c) g(x)=cot[4(x-pi)] d) g(x)=cot[4(x+pi)] e) g(x)=cot[4x+pi] please include how you got the answer
*July 25, 2011*

**Pre Cal**

If the graph of f(x)=cotx is transformed by a horizontal shrink of 1/4 and a horizontal shift left pi, the result has what equation?
*July 25, 2011*

**Pre Cal**

please explain your b and a.
*July 25, 2011*

**Pre Cal**

a Function f is defined as f(x)=3*2^x a)is f increasing or decreasing? b)write equation for the horizontal asymptote c)describe the end behavior of
*July 25, 2011*

**Pre Cal**

why and how do you know
*July 25, 2011*

**Pre Cal**

Which of the following represents the graph of y=f(x) first shifted down 1 and reflected in the x-axis? a) y=f(-x)-1 b)y=-(f(x)-1) C)y=-f(x)-1 d) y=abs(f(x-1))
*July 25, 2011*

**Math**

subsitute you x in the f(x) equation for what g(x) equals. f(g(x))= 5(x^2+3) +2 =5x^2+15+2 =5x^2+17
*July 25, 2011*

**Pre Cal**

If the graph of f(x)=cotx is transformed by a horizontal shrink of 1/4 and a horizontal shift left pi, the result is what?
*July 25, 2011*

**Pre Cal**

a Function f is defined as f(x)=3*2^x a)is f increasing or decreasing? b)write equation for the horizontal asymptote c)describe the end behavior of f
*July 25, 2011*

**Pre Cal**

Which of the following represents the graph of y=f(x) first shifted down 1 and reflected in the x-axis? a) y=f(-x)-1 b)y=-(f(x)-1) C)y=-f(x)-1 d) y=abs(f(x-1))
*July 25, 2011*

**Pre Cal**

which of the following best describes the behavior of thre function f(x)=(x^2-2x)/(x^2-4) at the values not in its domain? a) one vertical asymptote, no removable discontinuities b) 2 vertical asymptotes c) two removable discontinuities d) one removable discontinuity, one ...
*July 24, 2011*

**math**

a 6' person is standing x feet away form a 10' lamppost. what is the distance d from the base of the lamppost to the end of the person's shadow, expressed as a function of x
*July 24, 2011*

**Pre Cal**

simplify the quotient: [x(5x+1)-3(x^2+1)]/ [(x-1)^2]
*July 24, 2011*

**Pre Cal**

a piece of wire 5 inches long is to be cut into two pieces. One piece is x inches long and is to be bent into the shape of a square. the other piece is to be bent into the shape of a circle. Find an expression for the total area made up by the square and the circle as a ...
*July 24, 2011*

**Pre Cal**

find the surface area of a box of hieght h whose base dimensions are p and q, and that satisfies either one of the following conditions: a) the box is closed. b) the box has an open top. c) the box has an open top and a square base.
*July 24, 2011*

**Pre Cal**

a function f is defined as f(x)= square root of (x+4). a) identify the domain of the function b) identify the range of the function c)Compute the intercept d) compute the x intercept E) sketch a graph of the function
*July 24, 2011*

**Pre Cal**

a 6 foot person is standing x feet away form a 10 foot lamppost. What is the distance d from the base of the lamppost to the end of the persons shadow, espressed as a function of x.
*July 24, 2011*

**english**

can you check to see if i identified the verbs correctly and used the correct tense. 1. For as long as I can remember, education has been a constant factor in my life. ( present progressive) 2. I received my first academic award in elementary school and it changed my whole ...
*July 22, 2011*

**business**

Discuss the pros and cons of the following statement: "Egalitarian companies are more innovative".
*July 19, 2011*

**Chemistry**

A line in the Lyman series of the hydrogen atom emission results from the transition of an electron from the n=3 level to the ground state level. a) What n level (#) is the ground state level for the hydrogen atom? b) What is the energy of this photon in Joules? c) What is the...
*July 18, 2011*

**Chemistry**

I don't understand this problem at all, I'm very confused, help would be greatly appreciated
*July 17, 2011*

**Chemistry**

c) What is the frequency (in Hz) and wavelength (in nm) of the emitted photon?
*July 17, 2011*

**Chemistry**

A line in the Lyman series of the hydrogen atom emission results from the transition of an electron from the n=3 level to the ground state level. a) What n level (#) is the ground state level for the hydrogen atom? b) What is the energy of this photon in Joules?
*July 17, 2011*

**Stats**

What z-score corresponds to a raw score of 68.7 when mean=60 and sd=4.3
*July 17, 2011*

**math**

(4y^3 − 5)^2 [4.6] Multiply.. Thanks :)
*July 17, 2011*

**chemistry**

How many grams of CuCl2 are required to make 75 mLof a 0.20M solution?
*July 15, 2011*

**chemistry**

What volume of 0.25M solution can be made from5.0 gof KCl?
*July 15, 2011*

**chemistry**

How many grams of KMnO4 should be used to prepare 2.00 L of a 0.500M solution?
*July 15, 2011*

**math**

Thank you
*July 15, 2011*

**math**

List the terms, coefficients, and degree of the following polynomial: 7x^4 – 3x^2 + 5x + 2/3 Can someone help me with this please. Thank You! :)
*July 15, 2011*

**biology**

Mitochondria vs Chloroplast The major difference between mitochondria and chloroplast is that the latter contains thylakoid membranes and pigment molecules, whereas the mitochondria membranes contain respiratory enzymes not found in chloroplast membranes. Chloroplasts ...
*July 15, 2011*

**Confidentiality of Health Information**

your medical records are private. but it depends on the 3rd parties requestiing the info for it to be made available to them. next time you visit the hospital save the medical records privacy act. almost any medical facility you go now will provide the info to you. someone ...
*July 14, 2011*

**Algebra**

Construct a truth table for (p ^ ~q) <-->q ^ is meant to be a conjunction symbol
*July 14, 2011*

**Algebra**

Construct a truth table for ~q v ~p. I am really lost here.
*July 14, 2011*

**Algebra**

Translate the following statement into English (~r v q)-> ~p The v in the center is for "disjunction" and "or" and that is an arrow meaning "if-then" after the parentheses. p=Jamie is on the train q=Sylvia is at the park r=Nigel is in the car
*July 14, 2011*

**Math**

Can someone help me with this one problem Please! :) Add: (-1/3x^2-1/4x+3/4)+(1/2x^2-1/4x-1/2)
*July 12, 2011*

**math**

List the coefficients of the given polynomial: -x3 – 4x2 + 3x – 6 My answer was going to be: -1, -4, 3, -6
*July 12, 2011*

**Math**

I completely agree with you. I am a visual learner and this book is so hard for me to understand it isn't even funny. I am so stressed out and i thank you for your help really.
*July 10, 2011*

**Math**

Simplify the following expression, and rewrite it in an equivalent form with positive exponents. 24x^3y^-3/72x^-5y^-1 My answer was going to be: 24/72*x^3/x^-5=y^=3/y^-1
*July 10, 2011*

**Math**

Thanks for your help. I wasn't even using the ^2 outside the parenthesis. Thank YOu! Ashley
*July 10, 2011*

**Math**

Raise the quantity in parentheses to the indicated exponent, and simplify the resulting expression. Express answers with positive exponents (-33xy^-1/66x^0y^-3)^2 This is the answer i am getting from TRYING to follow my online book. Please Help Me. Thank You! -33/66*x^-3/y^-1y...
*July 10, 2011*

**Math**

Simplify the following expression squareroot -14 squareroot -56 (My answer is going to be 7)
*July 10, 2011*

**Math ( Algebra)**

Short Answer: Raise the quantity in parentheses to the indicated exponent, and simplify the resulting expression. Express answers with positive exponents (-33xy^-1/66x^0y^-3)^2
*July 10, 2011*

**Math**

A sales representative must visit five cities. There are direct air connections between each of the cities. Use the multiplication rule of counting to determine the number of different choices the sales representative has for the order in which to visit the cities. ____choices
*July 7, 2011*

**Algebra 1 **

I have a problem that says: Combine these two statements into a single mathematical statement: x>2 and x<7. I'm not sure if I'm supposed to do this by graphing a number line or not, is there a way to do it without a number line?
*July 4, 2011*

**chemistry**

How many grams of Na2CO3 are required to completely react with 35.6mL of a 0.315M HCl solution? Na2O3(s) + 2HCl(aq) --> 2NaCl(aq( + CO2(g) + H2O(I)
*July 2, 2011*

**chemistry**

How many grams of Na2CO3 are required to completely react with 35.6mL of a 0.315M HCl solution? Na2O3(s) + 2HCl(aq) --> 2NaCl(aq( + CO2(g) + H2O(I)
*July 2, 2011*

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