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December 21, 2014

Posts by Jake


Total # Posts: 1,791

Math
Bob can swim at a rate of 5km/h. He is in a river that is flowing at a rate of 9 km/h. a) if bob swims upstream, what is his relative velocity to the ground? b)if bob swims downstream, what is his relative velocity to the ground? c) Someone decides to help Bob out of the water...
March 19, 2012

Chemistry
Why doesn't water undergo electrolysis? Why does Na2SO4 undergo electrolysis?
March 19, 2012

trig
verify that 2/1+cos theta - tan squared (theta/2) = 1
March 19, 2012

Math
Multiplying a vector by a scalar results in: a) a scalar b) a perpendicular vector c) a collinear vector c) a parallel scalar
March 18, 2012

Math
Sabrina and John cut a pie into 4 slices. Sabrina eats 2 slices. John eats the rest. What fraction names the part of the pie that John eats?
March 14, 2012

Biology
Among humans, increased interest in food intake normally occurs _____. only after the production of glucose in the liver can no longer meet metabolic needs when fewer calories are taken in than are expended, but only after the body depletes its reserves of fat in the liver via...
March 14, 2012

SCIENCE/ earth
Thanks Ms Sue!!!
March 14, 2012

SCIENCE/ earth
plate tectonics crossword puzzle what Qs and As can i use??????? PLZZZZZ HELP ME!!!!!!!!!!!!!
March 14, 2012

PHYSICS
A space explorer is 4.6 billion km away from a certain star, and observes that the gravitational force of attraction exerted on the spacecraft by the star is 500 N. What will the force become when the craft has approached to a position 2 billion km from the star?
March 11, 2012

PHYSICS
Determine the value for the acceleration due to gravity at the surface of the planet Mars, given the following data: Mass of Mars = 6 .42 x 10^23 kg Radius of Mars = 3.37 x 10^6 m Thanks!
March 10, 2012

chemistri
so are dispersion forces one of them?
March 10, 2012

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

math
3/7
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

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

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

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