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Thu Feb 28, 2013 10:52 pm
Forum: Calculus
Topic: Velocity? "A ball is thrown vertically upward..."
Replies: 1
Views: 2798

### Velocity? "A ball is thrown vertically upward..."

A ball is thrown vertically upward from the top o f a 100-ft-high building. Its height above the ground at time t is given by h(t)=100+30t-16t^2 At what time is the ball falling toward the earth at 46 ft/sec? I've worked this problem several times, yet I always come out with the answer as t=-1/2. Th...
Tue May 03, 2011 4:09 pm
Forum: Intermediate Algebra
Topic: economic formula
Replies: 5
Views: 5198

### Re:

What do you mean by a sales volume equation? Or a revenue equation? I have never heard of either of them. Thanks for your help!
Thu Apr 28, 2011 5:20 pm
Forum: Intermediate Algebra
Topic: economic formula
Replies: 5
Views: 5198

### Re: economic formula

Thank you. I understand the canoe example, and that is actually how I began my problem, writing down concrete numbers and translating it to a formula, and figured that, for my problem, my equation was -20p^2+100p+1000. And they only ask for an equation, not an answer, so I figured I did not need to ...
Thu Apr 28, 2011 4:47 pm
Forum: Intermediate Algebra
Topic: economic formula
Replies: 5
Views: 5198

### economic formula

I've been given an economics problem in my calculus class. I have an example with a formula, from a previous assignment, but it doesn't seem to apply to my current problem. Suppose that 1000 frankfurters can be sold every week at a food stand for \$1 each. For every increase of \$.20 per frankfurter, ...
Wed Mar 23, 2011 6:52 pm
Forum: Calculus
Topic: non linear function derivative
Replies: 2
Views: 3047

### Re: non linear function derivative

Thank you so much for your help. I derivated with respect to time. So x dx/dt + y dy/dt =0. Solve algebraically and get dx/dt= -ydy/xdt and plug in the given values. The velocity, -3, is dy/dt, and x and y are 4 and 3, respectively. The answer is 9/4.

Thanks again!
Fri Mar 18, 2011 7:19 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: imaginary numbers? value of (1 + i)^100
Replies: 4
Views: 3736

### Re: imaginary numbers? value of (1 + i)^100

So the answer would be 2^50?
Fri Mar 18, 2011 7:10 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: imaginary numbers? value of (1 + i)^100
Replies: 4
Views: 3736

### Re: imaginary numbers? value of (1 + i)^100

You are right, I wasn't thinking.
Fri Mar 18, 2011 7:08 pm
Forum: Calculus
Topic: non linear function derivative
Replies: 2
Views: 3047

### non linear function derivative

A particle moves in a circular orbit described by the equation x^2 +y^2=25. As it passes through (4.3), its y coordinate is decreasing at a rate of 3 units/sec. What is the rate of change of the x coordinate the instant the particle is passing through the point (4,3)? I figured I would dreivate the ...
Tue Jan 18, 2011 5:44 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: imaginary numbers? value of (1 + i)^100
Replies: 4
Views: 3736

### imaginary numbers? value of (1 + i)^100

(1+i)^100 equals which of the following quantities?
(a) 2^100
(b) -2^50
(c) 2^50
(d)1-2^100

I do know that i^2 is -1. so i^100=-1^50, right?
1^100=1.
So, 1-1^50 is what I come up with, and that is 0. Not an option. Can you tell me where I'm going wrong?
Mon Dec 13, 2010 8:40 pm
Forum: Calculus
Topic: Functional notation confusing.
Replies: 6
Views: 5620

### Re: Functional notation confusing.

I'm sorry to be so thick. Can we start over? f(x)=2/x and (f(x+h)-f(x))/h so I sub the second equation into the first, right? And end up with 2h/((x+h)-x), which must not be right... because solved algebraically it does NOT give me the right answer. So I need help with the very first step, I think. ...

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