 Homework Help College Algebra and Trigonometry en>fr fr>en By dancingincereal Comments: 767, member since Wed Feb 21, 2007On Sat Jun 18, 2011 02:54 PM
Locked by dancingincereal (174103) on 2011-06-19 07:00:13 I solved the problem.
I have two homework problems that I'm stuck on, and if anybody could provide me any help at all, that would be greatly appreciated. Also, if you have any other questions about the homework problems feel free to ask. Thanks for any help!
1) The distance, d, in miles that a person can see on a clear day from a height, h, in feet is given by d(h) = 1.22 square root of h.
a. Evaluate d(20,320) and explain what it means.
b. Estimate the height you need in order to see 100 miles.
c. Write your answer to part (b) with function notation.
2) (-150, 1800), m = -24
a. Write an equation in point-slope form for the line that passes through the given point and has the given slope.
b. Put your equation from part (a) into slope-intercept form. 2 Replies to College Algebra and Trigonometry |
re: College Algebra and Trigonometry en>fr fr>en By Mendel  Comments: 1790, member since Wed Feb 23, 2005On Sat Jun 18, 2011 07:51 PM
Are you sure question 1a is written correctly? The original statement gives "d" as a function of one variable, "h." In 1a, you're being asked to determine "d" as a function of two values (20 and 320), and it's not clear which of these is the height.
I'm not sure if I'm interpreting your initial formula correctly, but I'm assuming it means:
d= 1.22*h^(1/2) [note that h^(1/2) is an alternate way to express "square root of h"]
I'll walk you through 1b:
The distance you want to be able to see is 100 miles. This is the value for "d"
So: 100= 1.22*h^(1/2)
divide both sides by 1.22
81.96=h^(1/2)
Square both sides
6718 miles=h
This sounds like a ridiculously high value, so I'm not sure if I'm reading your original equation correctly.
2. equation of a line can be given as y=mx+b
You have values for m (-24), x(-150), and y(1800), so you can find "b" from here and write it into the equation. |
re: College Algebra and Trigonometry en>fr fr>en By dancingincereal Comments: 767, member since Wed Feb 21, 2007On Sun Jun 19, 2011 06:59 AM
Thanks for all of your work! I did type it correctly. I ended up getting help from a friend, and I understand it now.
It wanted you to use 20 and 320 as distance. So you plugged both into the original equation. It was a stupid problem.
But anyways, thank you so much! |