Sunday

February 19, 2017
Total # Posts: 2,193

**chemistri**

what are van der waals forces

*March 10, 2012*

**work hours**

If i am making $11.50 an hour, 4 hours a day from monday through friday, how much do i get by the end of the month?

*March 8, 2012*

**Calculus**

I keep getting the wrong answer :| I don't know what I have done wrong...

*March 7, 2012*

**Calculus**

Could someone help me setup an equation for this equation? --------------------------------- A city bus system carries 4000 passengers a day throughout a large city. The cost to ride the bus is $1.50/person. The owner realizes that 100 fewer people would ride the bus for each...

*March 7, 2012*

**physical science**

6. If one body is positively charged and another body is negatively charged, free electrons tend to [A. move from the negatively charged body to the positively charged body.] B. remain in the positively charged body. C. remain in the negatively charged body. D. move from the ...

*March 6, 2012*

**INTRODUCTION TO THE SHORT STORY, PART 1**

d is correct answer just took the pf test

*March 5, 2012*

**Engish**

I need to find the statment of life in the call of the wild by jack london

*March 4, 2012*

**Calculus**

The fuel efficiency, E, in litres per 100 km, for a car driven at speed v, in km/h is E(v)=1600v/(v^2+6400). a) Determine the legal speed speed that will maximize the fuel efficiency if the speed limit is 50 km/h. The answer is 50 km/h but my teacher said it can't be that...

*March 4, 2012*

**Calculus**

An object moves in a straight line. Its velocity, in m/s, at time t is v(t)=4t^2/(1+t^2),t≥0. Determine the maximum and minimum velocities on the interval 1≤x≤4.

*March 3, 2012*

**Math**

The concentration C(t), in milligrams per cubic centimetre, of a certain medicine in a patient's bloodstream is given by C(t)= (0.1t)/(t+3)^2 where t is number of hours after the medicine is taken. Determine the maximum and minimum concentrations between the first and ...

*March 3, 2012*

**Calculus**

An object moves in a straight line. Its velocity, in m/s, at time t is v(t)=4t^2/(1+t^2),t≥0. Determine the maximum and minimum velocities on the interval 1≤x≤4. The answer says min. velocity is 0m/s but has no maximum?

*March 3, 2012*

**Calculus**

Can someone explain this question to me? What intervals should I use to test whether or not the graph is concave up or down. I know that no points or equations are given so we have to estimate. Here is the URL for the graph. imgur dotcom/FdQCV

*March 3, 2012*

**Calculus**

Let f(x)=(2x^3-x^2+2x+1)/(x^2+1). What is the equation of the oblique asymptote of f(x)? Can someone show me how to do the long division one for this question. I have always used synthetic division but realized there are some questions that require to do long division.

*February 29, 2012*

**Calculus**

Let f(x)=x^2-8x+16 and g(x) x^2-16. For what values of x is f(x)/g(x) increasing? Explain plz~

*February 28, 2012*

**Physics 161**

what is your "m" in your equations stand for?

*February 28, 2012*

**Physics 161**

A cat dozes on a stationary merry-go-round, at a radius of 6.9 m from the center of the ride. The operator turns on the ride and brings it up to its proper turning rate of one complete rotation every 7.3 s. What is the least coefficient of static friction between the cat and ...

*February 28, 2012*

**Calculus**

Let f(x)= (3x^2-2x+1)/(x-1). What are the types of asymptotes of f(x)? What are the equations of all the asymptotes of f(x)? The types of asymptote are vertical and oblique? x=1? Is there something wrong I did

*February 28, 2012*

**Calculus**

Determine the points at which f'(x)=0 for each of the following functions: f(x)= x^3+6x^2+1 f'(x)=3x^2+12x What to do next?

*February 25, 2012*

**Calculus**

The fuel efficiency, E, in litres per 100 km, for a car driven at speed v, in km/h is E(v)=1600v/(v^2+6400) a) determine the legal speed that will maximize the fuel efficiency using speed limit of 50 km/h

*February 24, 2012*

**Calculus**

An object moves in a straight line. Its velocity, in m/s, at time t is v(t)=4t^2/(4+t^3), t>(greater or equal)0. Determine the maximum and minimum velocities over time interval 1<t<4 I got minimum as 1= 4/5. However for maximum at t=4, I got 16/17 but the book says 4/3?

*February 22, 2012*

**Calculus**

An object moves in a straight line. Its velocity, in m/s, at time t is v(t)=4t^2/(4+t^3), t>(greater or equal)0. Determine the maximum and minimum velocities over time interval 1<t<4 I got minimum as 1= 4/5. However for maximum at t=4, I got 16/17 but the book says 4/3?

*February 22, 2012*

**Calculus**

For which point(s) on the graph of f(x)=5x/(x+2) is the slope of the tangent 2/5? a) (-3,15) b) (7, 35/9) c) (3,3) and (-7,7) d) (24, 60/13) Answer is C?

*February 21, 2012*

**Calculus**

Thanks!

*February 21, 2012*

**Calculus**

Verify if correct or not please =) What is the slope of the normal to y= (x^2-1)/(x+5) at (1,0) a) -3 b) -1/2 c) -1/3 d) 1/3 Answer is A, -3. ---------------------------------------- What is the y-intercept of the line that is tangent to f(x)=4/(3x+1) at (-1, -2)? a)-5 b) -3/4...

*February 21, 2012*

**Math**

if h(t) = 17.4 * 1.23^1, find h(13)

*February 20, 2012*

**math - probability**

1. 7 over 8

*February 20, 2012*

**Ground School: Regulations**

I am working on my private pilot license and these regulation things, HOW do you learn all of them?????????

*February 20, 2012*

**Piloting: stumped**

We are taking the class together and have questions about it. we aren't the same person!!

*February 20, 2012*

**math**

If you flip 2 coins then 25% chance

*February 20, 2012*

**math**

4 out of 5 that the number will be less than 900

*February 20, 2012*

**Math**

if f is an exponential function, and f(5)=20 and f(9) = 14, use the add-multiply property to calculate f(13),f(17), and f(21). Show your method

*February 19, 2012*

**chemistryyyy**

A solution is made by dissolving 0.0100 mol of HF in enough water to make 1.00 L of solution. At 23 °C, the osmotic pressure of the solution is 0.308 atm. What is the percent ionization of this acid? Please help.

*February 19, 2012*

**Calculus-derivatives**

Verify these answers~ 1. For what value(s) of x does f(x)=(x^2-16)^5 have a horizontal tangent? a) x=-4,4 b) x=-4,0,4 c) x=0 d) x=0,4 Answer is B, x=-4,0,4 --------------------------------------- 2. What is the derivative of f(x)=(3x^2+7)^3? a) f'(x)=3(3x^2+7)^2 b) f'(...

*February 18, 2012*

**Calculus-derivatives**

What is the slope of the tangent of each curve at given point y=√(16x^3), (4,32) If I find the derivative of y=√(16x^3) Will it be 16/-x^3

*February 15, 2012*

**Calculus-derivatives**

So for number 1 the answer is t=1 -2+2t=0 2t=2 2/2=1

*February 15, 2012*

**Calculus-derivatives**

Oh crap nvm!

*February 15, 2012*

**Calculus-derivatives**

For number one we find the derivative of 3-2t+t^2 wouldn't that be t-2?

*February 15, 2012*

**Calculus-derivatives**

Explain how to do these questions~ 1. An object moves in a straight line with its position at time t seconds given by s(t) = 3-2t+t^2, where s is the measured in metres. At what time is the object not moving? 2. Determine the coordinates of the point(s) on the graph of y=3x- 1...

*February 15, 2012*

**Math**

a ship leaves sydney heads and travels 45 km due east. it then returns and travels 86 km due north. how far is it from its starting point? please guys step by step.. thank you in advance.

*February 15, 2012*

**Calculus**

Explain how you got the answer please.

*February 14, 2012*

**Calculus**

What is the derivative of 6/x?

*February 14, 2012*

**Calculus**

For each function, find the derivtive f'(a) for given value of a f(x) = sqrt(x+1), a=0

*February 14, 2012*

**Calculus**

Thank you~

*February 13, 2012*

**Calculus**

May I know where you got 5a + 5h - 2

*February 13, 2012*

**Calculus**

Find each function, find f(a+h) and f(a+h)-f(a) a) f(x)=5x-2

*February 13, 2012*

**English**

What are 25 facts about Mr. Frank after the annex

*February 13, 2012*

**Calculus**

Why is it important to determine continuity of the function?

*February 13, 2012*

**Math**

State the equation of the line passing through the points (7,-1) and (2,2) a) 5x+3y-16=0 b) -5x-3x-16=0 c) -3x - 5y - 16=0 d) 3x + 5y-16=0 ------------------------------------ Is letter D correct?

*February 12, 2012*

**Chemistry**

How do you find the ratio of moles of oxygen to moles of tin? What would be the Empirical formula of tin oxide from the result of ratio? From my calculations I got the moles as: Moles of oxygen = 1.761 x 10^-2 Moles of Tin = 8.944 x 10^-3 Thanks!

*February 11, 2012*

**Calculus**

Examine the continuity of the function h(x)=[-x, if x<0 .......0, if x=0 .......x, if x>0 I don't understand this question...

*February 10, 2012*

**Calculus**

Thank you~~

*February 8, 2012*

**Calculus**

Determine the equation of the line described by the given information. a) slope -2/3, passing through (0,6) b) passing through points (2,7) and (6,11) c) parallel to y=4x-6 passing through point (2,6)

*February 8, 2012*

**Calculus**

Determine an expression, in simplified form, for the slope of the secant PQ. Given: P(1,3) , Q(1+h, f(1+h)) , where f(x) = 3x^2 PQ=Y2-Y1/X2-X1 I keep getting wrong answer, arghhh.

*February 8, 2012*

**Calculus**

How to rationalize this question? (√3 - √2)/(√3+√2) Do I multiply those two by(√3 - √2) or (√3 + √2)

*February 7, 2012*

**algebra**

How do you write someone is older than 27 by less than 38 as an inequality?

*February 4, 2012*

**Physics**

An elevator (mass 4175 kg) is to be designed so that the maximum acceleration is 0.0700g. What is the maximum force the motor should exert on the supporting cable?

*February 1, 2012*

**Precalculus**

How can i write this in log form 5^-2 = 0.04

*February 1, 2012*

**Precalculus**

Quad III and IV? May I know how you got 3.86132? and value for quad IV?

*January 31, 2012*

**Precalculus**

Solve for x, 0<x<2pi 3sin^2x - sinx -2=0 Its not factorable, do I use quadratic formula?

*January 31, 2012*

**Precalculus**

The answer says:16.0 or 74.0 degrees :|

*January 31, 2012*

**Precalculus**

When a projectile leaves a starting point at an angle of elevation of theta with a velocity v, the horizontal distance it travels is determined by: d=v^2/(32) sin2theta Where d is measured in feet and v in feet per second. An outfielder throws the ball at a speed of 75 miles ...

*January 31, 2012*

**Physics**

10m/s

*January 31, 2012*

**Precalculus**

Write 4log2+log6-log3 as a single logarithm. Explain with steps please!~~

*January 30, 2012*

**Precalculus**

If the base was 2 then it would be cuberoot 2^6?

*January 29, 2012*

**Precalculus**

Evaluate log(Base4) ^3sqrt64 (The ^3 is an exponent infront of sqrt 64) I keep getting wrong answer :|

*January 29, 2012*

**Precalculus**

Solve for x: 6^(x+3) - 6^x = 215. I got answer as 1, is it correct?

*January 29, 2012*

**Precalculus**

Thankk you! Took me long to figure it out!

*January 28, 2012*

**Precalculus**

Solve 5^(2-x) = 1/125 for x.

*January 28, 2012*

**Math**

How do I solve this if there is no equation to this 1. The population of the bacteria in a Petri dish increases by a factor of 10 every 10 hour. If there are initally 20 bacteria in the dish, how long will it take before the population increases to 60,000 to the nearest tenth ...

*January 28, 2012*

**history**

What is the term for the power to make final decisions?

*January 28, 2012*

**government**

What is the term for the power to make final decisions?

*January 28, 2012*

**Math**

Determine the exact value of cos 465 degrees a) √3 + √2/2 b) √2 + √3√2/4 c)√2 - √3√2/4 d)2+√2-√3√2/4

*January 27, 2012*

**Math**

Explain how to do this with steps please. 1. Simplify cos(x-y)+cos(x+y)/cosx I did some of these so far, don't know if it is correct. Formula: cosxcosy= cos(x+y)+cos(x-y)/2 cos(x-y)+cos(x+y)/cosx =cosxcosy/2cosx

*January 26, 2012*

**Math**

Explain how to do this with steps please. 1. Simplify cos(x-y)+cos(x+y)/cosx Formula: cosxcosy= cos(x+y)+cos(x-y)/2 cos(x-y)+cos(x+y)/cosx =cosxcosy/2cosx

*January 26, 2012*

**Math**

Justine measures the milk in two different cartons. One carton contains 1 liter and 665 milliliters of whole milk, and the other carton contains 1 liter and 183 milliliters of chocolate milk. How much more whole milk is there than chocolate milk?

*January 26, 2012*

**Math**

How come I am not suppose to get rid of the the denominator?

*January 25, 2012*

**Math**

How many solutions does the equation cosx + 1/2 = 1 have for 0<x<2pi cosx+1/2=1 cosx+1=2 cosx=2-1 cosx=1 therefore 1 solution? A) 1 b) 2 c) 3 d) 4

*January 25, 2012*

**Math**

Solve (sinx-1)(cosx -1/2) = 0 where 0≤x<2pi a) pi/3, pi/2, 5pi/3 b) pi/6, 5pi/6, pi c) pi/3, pi, 5pi/3 d) pi/6, pi/2, 5pi/6

*January 25, 2012*

**Math**

Thank you~ T.T my school is fast paced, I am trying to keep up...

*January 25, 2012*

**Math**

How did you get 1 + cot^2 x?

*January 25, 2012*

**Math**

What is the first step. Explain please. Which expression is equivalent to cos^2x + cot^2x + sin2^x? a) 2csc^2x b) tan^2x c) cot^2x d) csc^2x cos^2x + cot^2x + sin2^x

*January 25, 2012*

**inventions**

Need to come up with an invention

*January 25, 2012*

**Precalculus**

Which value for x is a solution to cosx = sqrt of 2/2? a) -9pi/4 b) 3pi/4 c) -3pi/4 d) 4pi/3 What is the first step I should do?

*January 24, 2012*

**Math**

Options are a) 0 b) 1 c) -1 d) undefined

*January 24, 2012*

**Math**

Could someone explain the steps for this question. Simplify the expression tan(5pi/8)-tan(3pi/8)/1+tan(5pi/8)tan(3pi/8)

*January 24, 2012*

**English**

I am doing an application it says: Have you held any leadership type positions? Yes/No Please describe (100 words or less) I did not have any leadership type positions, so no. My question is, do I have to explain why I did not have any leadership or is it only if I say yes?

*January 23, 2012*

**math**

During an art contest you and a classmate each won blue ribbons for 1/3 of the pieces you entered. You won 2 blue ribbons and the classmate win 3. Explain how.

*January 20, 2012*

**Math**

If the diameter of a monster truck tire is 3.5 m and it makes one rotation every 5 seconds, how far does the tire roll in 1 minute? Diameter 3.5 radius: 3.5/2 = 1.75 12(2pi x 1.75) =131.9 m the book states that its 263.89 m? What did I do wrong?

*January 19, 2012*

**Math**

I am confused for number 3

*January 19, 2012*

**Math**

I am still confused for number 2. For number 3, you used the amplitude(which is 4) to find lowest+highest?

*January 18, 2012*

**Math**

1. The height of a bumble bee above the ground is modelled by h(t) = 0.5cos(2π t) + 2, where h is in metres and t is in seconds. At what time is the bee’s instantaneous rate of change of height with respect to time greatest? a.) 1 s b.) 1.25s c.) 1.5s d.) 2s Why is ...

*January 18, 2012*

**Math**

Thank you~

*January 18, 2012*

**Math**

Why is 32/5 = 6 2/5?

*January 18, 2012*

**Math**

If an object travels in a circle 32pi/5 radians, at what degree measure is it, relative to where it started? a) 1052° b) 144° c) 72° d) 98.6° I got 1152° but there is no option for the answer, what did I wrong?

*January 18, 2012*

**Math**

How do you find the distance? Please explain the steps >< A ball in a pinball machine moves 13 of the way through a circular groove that has radius 3 m. How far does the ball travel? a. 3.14 m b. 360 m c. 6.28 m d. 0.69 m

*January 18, 2012*

**math**

i think it is b credit unnion

*January 11, 2012*

**math**

7. A _______ is a group of people who agree to save their money together and to make loans to each other at a relatively low rate of interest. [A. commercial bank] B. credit union C. Christmas club D. investment firm

*January 11, 2012*

**math**

3. The gross income of David Vaughn is $785 per week. His deductions are $42.25, FICA tax; $90.33, income tax; 2% state tax; 1% city tax; and 3% retirement fund. What is her net income for one week? A. $675.32 B. $628.77 [C. $605.32] D. $749.77

*January 10, 2012*