Tuesday
December 6, 2016

# Posts by JH

Total # Posts: 57

physics
A riverboat travels with a velocity of 4.60 m/s from one shore to another. The velocity of the river is 2.30 m/s. If the width of the river is 72.0 m, how far does the boat travel downstream to reach the other shore?
September 21, 2016

chemistry
a solution contains 0.216 moles of a base and 0.614 moles of the conjuagte acid in a total volume of 800 mL. The pH of the solution 9.65. what is the value for kb of the base? the answer is 1.27E-4 how do you do it? do you need to convert from moles to molarity idek.
March 27, 2015

Math
kajdhkajhdd
October 25, 2014

Math
Let 'x' equal (2theta/3). If cot(x) = -sqrt3, then tan(x) = -1/sqrt3. Locating Tan(x) on the unit circle brings us pi/6. So, X=pi6 is the same as (2theta/3)=pi/6. Multiply both sides by 3. 2theta=pi/2. Multiply both sides by 1/2. Theta=pi/4. <<done
September 29, 2014

Management
Uhm Management, a slew of your answers are incorrect - I mean more than half are
May 17, 2012

Precalculus
NEED HELP!! Find all numbers t such that cos^-1 t = sin^-1 t.
April 11, 2010

Precalculus
I got them :). Thank you so much for explaining it really well, my textbook doesn't explain well at all, that's why I was struggling!! Thank you once again!!
April 6, 2010

Precalculus
PLEASE HELP!! Solve: 1. cos(arcsin(4/5))= ?? 2. tan(arccos(4/5))= ?? 3. cos(arctan(3))= ?? Note: Give exact answers!!
April 6, 2010

Precalculus(NEED HELP ASAP PLEASE!!)
So, tan(theta)=sin(theta)/cos(theta) cos(theta)=sin(theta)/tan(theta) =(1/sqrt(10))/(1/3) = 3/sqrt(10) ?? But its incorrect!! What am I doing wrong?
March 28, 2010

Precalculus(NEED HELP ASAP PLEASE!!)
cot(theta)= 3 pi < theta < 3pi/2 Find: sin(theta)= -1 ? cos(theta)= -3 ? tan(theta)= 1/3 ? sec(theta)= -1/3 ? csc(theta)= -1 ? That's what I came up with, but they are not correct, PLEASE help me where I went wrong!!
March 28, 2010

Precalculus(NEED HELP ASAP PLEASE!!)
PLEASE HELP!! csc(theta)= -3/2 3pi/2 < theta < 2pi Find: sin(theta)= _____ ? cos(theta)= _____ ? tan(theta)= _____ ? cot(theta)= _____ ? sec(theta)= _____ ?
March 28, 2010

Precalculus(NEED HELP ASAP PLEASE!!)
PLEASE HELP!! sin(theta)= 1/3 pi/2 < theta < pi Find: cos(theta)= ______ ? tan(theta)= ______ ? cot(theta)= ______ ? sec(theta)= ______ ? csc(theta)= ______ ?
March 28, 2010

Precalculus(NEED HELP ASAP PLEASE!!)
Damon I don't understand you 2nd post but is the answer: 0, pi/2, pi, and 3 pi/2 ?? If it is.. then unfortunately its not the correct answer. Do you think you went wrong somewhere?
March 25, 2010

Precalculus(NEED HELP ASAP PLEASE!!)
Solve: sin(theta)+cos(theta) = 1 0 < or equal to theta < 2pi Solution Set:__________ ?
March 25, 2010

Precalculus(NEED HELP ASAP PLEASE!!)
Solve: sin(theta)cos(theta)-sin(theta)−cos(theta)+1 = 0, 0 < or equal to theta < 2pi Solution Set: ____________ ?
March 25, 2010

Precalculus
Can anyone help me with this question please!! Show that (cosh x)^2 - (sinh x)^2 = 1 for every real number x.
March 22, 2010

Precalculus
Suppose f is a function with exponential decay. Explain why the function g defined by g(x)=1/f(x) is a function with exponential growth. PLEASE HELP!!
March 10, 2010

Precalculus
Explain why there does not exist a point on the horizontal axis whose distance from (5,4) equals 3. HELP!!
March 10, 2010

Precalculus
yes, these two points does equal to 15, but how did you find these points?
March 9, 2010

Precalculus
Find two points, one on the horizontal axis and one on the vertical axis, such that the distance between these two points equals 15. NEED HELP PLEASE!!
March 9, 2010

Precalculus
Yes, 1 is the answer. Thanks a lot for your help Reiny :)
March 9, 2010

Precalculus
This is an online assignment, we write the answer and the computer system recognizes whether the answer is right or wrong, but doesn't give any hint. See if this helps: The instructor gave us the formula 10log E/E0 and this question told us what EO is so we just plugged it...
March 9, 2010

Precalculus
No unfortunately this is not the correct answer :(, is there any other way of doing this question?
March 9, 2010

Precalculus
I have posted this question earlier as well but was unable to receive an answer. I don't know how to do this question at all, so PLEASE help me with this question and also show me the steps, so that I can learn. I would appreciate it a lot. A high sound level of 120 dB is ...
March 9, 2010

Precalculus
Right, I was using the radius as 100, but got it now. Thanks!!
March 9, 2010

Precalculus
A line segment has endpoints A=(1,3) and B=(13,19). a) Find the equation of the circle for which the segment AB is a diameter. Ans: (x - 7)^2 + (y - 11)^2 = 100 b) Accurate to the nearest tenth, the circumference of this circle is _______ ? I was able to find a)the equation ...
March 9, 2010

Precalculus(NEED HELP ASAP PLEASE!!)
So I get...... 10log(120/10^-12) = 140.7918125 But its incorrect :( what am I doing wrong ?
March 7, 2010

Precalculus(NEED HELP ASAP PLEASE!!)
NEED HELP ASAP PLEASE!! A high sound level of 120 dB is regarded as the threshold of pain for the average listener. If the threshold of hearing is 10^−12 watts/m^2, then the intensity of the sound corresponding to 120 dB is ____________ watts/m^2.
March 7, 2010

Precalculus
NEED HELP ASAP PLEASE!! A savings account starts with \$600 and pays 5% interest per year, compounded four times per year. a) A function that models the amount in dollars in the bank account after m years is A(m)=____________? b) How much will be in the savings account after 3 ...
March 4, 2010

Precalculus
NEED HELP ASAP PLEASE!! A bacteria culture starts with 2000 bacteria and the population doubles every 3 hours. a) A function that models the number of bacteria after t hours is p(t)=____________? b) The number of bacteria present after 5 hours will be about _____ ? c) The ...
March 4, 2010

Precalculus
I REALLY NEED HELP WITH THIS QUESTION, PLEASE HELP!! Give an example of a logarithmic function g, which has a vertical asymptote x = –2, and passes through the origin.
March 3, 2010

math
P=2l+2w (move 2w to the other side) -2w=2l-p 2w=2l+p w=2l+p/2 (make everything equal to w and cancel whatever is possible in this case 2) w = l+p (Final Answer) Hope this helps!!
March 3, 2010

Precalculus
Please help me with these questions ASAP!! Suppose that f(x)=log3(x-1) a)If f(6)=1.4 and f(8)=1.7,then evaluate log3(35) and log3(7/5). b)If f(3)=0.6, find log9(2).
March 3, 2010

Precalculus
PLEASE HELP ME WITH THESE QUESTION AS MUCH AS POSSIBLE!! Evaluate without a calculator. Give exact answers: a) log(log(10)) = ? b) square root (log(100)) - log(square root(100)) = ? c) log((square root 10^3)(square root 10^5)(square root 10) = ? d) 1000^log(3) = ? e) log(1/log...
March 1, 2010

Math
Evaluate the expression without using a calculator: log4(2)= ____? Use a calculator to find the logarithm accurate to four decimal places: log4(27)= ____?
February 14, 2010

Math
For the following, use the inverse relationship between logarithms and exponentials to determine x. log2(x^2−2x)=3 Solution Set:_____________? I don't know how to do this question at all :( Please help and show the work as well so that I can learn! Thanks.
February 13, 2010

Precalculus
Suppose f(x) = 3^x a) Find x where f(x) = 1/27. b) Estimate the value of x where f(x) = 24. So, a) f(x) = 3^x f(1/27) = 3^1/27 b) f(x) = 3^x f(24) = 3^24 Don't know how to solve them :( Please Help!!
February 10, 2010

Precalculus
Polynomials Problem: 1. List three factors of g(x) of the form x−r: x + 1, x - 1, x - 2 2. The smallest possible value for the degree of g is 3. 3. A function of the form axn that approximates g(x) for large values of |x| is f(x)= 3x^3. 4. This tells us that the degree ...
February 7, 2010

Precalculus
Thank You so much MathMate, the answer you gave is right :)
February 7, 2010

Precalculus
The question didn't list h(x) that's what we are trying to figure out using the all the information above (1-3). If (x^2+1) is also a factor of h(x), then h(x) = ____________ ?
February 7, 2010

Precalculus
Polynomials Problem: 1. List two factors of h(x) of the form x−r: x, x + 2 (right answer) 2. A function of the form ax^n that approximates h(x) for large values of |x| is f(x)= 2x^4. (right answer) 3. This tells us that the degree of h is 4 and the coefficient of the ...
February 7, 2010

Precalculus
State the domain of f(x) = x / x^2+4x+1
February 2, 2010

Precalculus
Sorry I don't understand y^2=-x^2 ?? Shouldn't it be:(y)(y)=(x)(-x) y^2 = -x ??
January 31, 2010

Precalculus
Give an example to show that the product of two one-to-one function is not necessarily a one-to-one function.
January 31, 2010

Precalculus
Suppose h(x) = 3/x^2-1. Find two nontrivial functions such that h(x)=(f o g)(x) (f o g referring to f of g)
January 31, 2010

Precalculus
Thanks!!
January 31, 2010

Precalculus
Show that sum of two even function with the same domain is an even function.
January 31, 2010

Math
f(0) = 0 is right f(-1) = 10 f(-1) = 5(-1)^2 - 5(-1) = 5(1) - (-5) = 5 + 5 = 10 f(2) = 10 f(2) = 5(2)^2 - 5(2) = 5(4) - 10 = 20 - 10 = 10 HOPE THIS HELPS!!
January 31, 2010

math
Thank You :)
January 31, 2010

math
Explain why there does not exist a function whose domain is {-1,0,3} and whose range is {3,4,7,9}. PLEASE EXPLAIN!!
January 31, 2010

math
Express the function f(x) = −[ 1/3]x^2 + 2x + 3 in the form f(x) = a(x + p)^2 + q by completing the square: f(x) = −[ 1/3]x^2 + 2x + 3
January 28, 2010

math
Express the function f(x) = −[ 1/3]x^2 + 2x + 3 in the form f(x) = a(x + p)^2 + q by completing the square: f(x) = −[ 1/3]x^2 + 2x + 3
January 28, 2010

math
The Question makes no sense to me. Have you forgoten anything?
December 2, 2008

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