Science & Mathematics - 28 August 2007

Over the weekend the Cheney's drove 450 miles. They drove three thimes as many miles on Sunday as they did Saturday. a. 3x=450 b. x+ x/3 =450 c. 3x -x =450 d. x + 3x=450

2007-08-28 13:02:50 · 10 answers · asked by Marie R 1 in Mathematics

a half gram in a nickel
1 gram in a dime
around 22-26 grams in an ounce
4 ounces in a quarter pound
8 ounces in a half pound
16 ounces in a pound

2007-08-28 13:02:23 · 6 answers · asked by Anonymous in Mathematics

2007-08-28 13:00:28 · 5 answers · asked by chad 2 in Physics

Insert grouping signals in the expression so that the expression is 14.

9 + 39 + 22 ÷ 11 - 9 + 3

thanks in advance!!

2007-08-28 12:59:09 · 11 answers · asked by Anonymous in Mathematics

2007-08-28 12:58:28 · 3 answers · asked by Azumi 2 in Biology

i dont know how to do this problem. its very very hard. = )

#2. a farmer owns a triangular field ABC. The side [AC] is 104m, the side [AB] is 65m and the angle between these two sides is 60 degrees.

a) calculate the length of the third side of the field

b) find the area of the field in the form p *squareroot*(3), where p is an integer

(same prob) Let D be a point on [BC] such that [AD] bisects the 60 degree angle. The farmer divides the field into two parts by constructing a straight fence [AD] of length x meters.

c) (I) show that the area of the smaller part is given by (65x) / 4 and find an expression for the area of the larger part
(II) hence, find the value of x in the form q *squareroot* (3), where q is an integer

d) prove that BD / DC = 5 / 8

PS. if its too long to answer here, you can email me at real_name_x@yahoo.com

thank again.

2007-08-28 12:58:25 · 1 answers · asked by john doe 2 in Mathematics

I have a math problem that has to do about parachutists and longitude. It says that the change in altitude is -25 ft/s. what does the 's ' stand for? Thanks guys!

2007-08-28 12:56:44 · 5 answers · asked by the.m.kid 2 in Mathematics

Write the equation of the line with x-intercept (–8, 0) and undefined slope.

2007-08-28 12:51:09 · 6 answers · asked by Anonymous in Mathematics

Question: Explain how rescue teams could use two of the postulates to locate a distress signal.

Here are the postulates:
Through any two points, there is exactly one line.
Through any three noncollinear points, there is exactly one plane containing them.
If two points lie in a plane, then the line containing those points lie in the plane.
If two lines intersect, then they intersect in exactly one point.
If two planes intersect, then they intersect in exactly one line.

Question 2:
What is the formula for the maximum number of segments determined by n points.

2007-08-28 12:50:15 · 1 answers · asked by Anonymous 2 in Mathematics

What is the simplified form of the MIdpoint Formula if one of the endpoints of a segment is (0,0), and the other is (x,y)?

2007-08-28 12:49:41 · 3 answers · asked by jkvbmc 2 in Mathematics

Rewrite the equation y = –3x + 5 as a function of x.

2007-08-28 12:48:35 · 5 answers · asked by Anonymous in Mathematics

2007-08-28 12:48:11 · 5 answers · asked by shogun644 1 in Mathematics

If i have 179c units of beans then how do I calcuate the weight of one bean??

2007-08-28 12:45:37 · 3 answers · asked by Steven V 2 in Chemistry

2007-08-28 12:45:10 · 12 answers · asked by emilyjih 2 in Mathematics

Find the average of the set of numbers.Round the average to the nearest tenth.

here is the numbers (16,9,3,25,3)

2007-08-28 12:43:52 · 11 answers · asked by Hoe 1 in Mathematics

5. The director of a summer day camp estimates that 100 children will join if the camp fee is $250, but for each $20 decrease in the fee, ten more children will enroll.

A. Determine the linear equation that will represent the number of children who will enroll at a given fee. Hint: To write the slope, you need two points on the line. Show all work to receive full credit.






B. Graph the linear equation that represents the number of children who will enroll at a given fee.




C. Approximately how many students will enroll if the camp fee is $180? Round to the nearest child.




D. Approximately how many students will enroll if the camp is free? Round to the nearest child.

2007-08-28 12:40:15 · 1 answers · asked by janval m 1 in Mathematics

2007-08-28 12:39:37 · 14 answers · asked by ... 2 in Mathematics

I am stuck on this question. I need to determine the expected frequency, f_2, of the second harmonic (n=2) standing wave with the given:

hanging mass = 150 g, linear mass density = 4.1 g/m and the length of the string is L = 1.8 m.

The equation I have been using is f_n = (n*V) / (2*L). Except I don't know V and how do I use the linear mass density (mu) in this case?

2007-08-28 12:39:04 · 3 answers · asked by Anonymous in Physics

Beginning of Calculus:

f(x) = x^3 - 225x

Instructions: Determine an appropiate viewing rectangle on a Calculator. In other words I'm looking for domain and range. My problem is, I've been away from Math for a bit, thus I'm rusty on some of the skills. When it comes to looking for the domain and range (x/y min and max), would I want to use the intercepts to do so? How else would one go about stating the appropiate domain and range, or "viewing rectangle" for this guy. Thanks a lot.

Camaren

2007-08-28 12:35:19 · 2 answers · asked by Camaren 1 in Mathematics

2007-08-28 12:32:40 · 1 answers · asked by Anonymous in Biology

The question is:
Suppose a car is traveling at 20 m/s and the driver see's a traffic light turn red. After .530 seconds has elapsed (the reaction time) the driver appiles the breaks and the car decelerates at 7.00m/s^2. What is the stopping distance of the car as measured from the point where the driver notices the red light?


Please explain the formula's used to arrive at the answer. Thank you.

2007-08-28 12:32:27 · 2 answers · asked by Jamgirl108 1 in Physics

it also keeps boiling with the touch of a hand, does it have to do with the pressure?

2007-08-28 12:30:02 · 3 answers · asked by Johanna S 1 in Other - Science

2007-08-28 12:28:08 · 6 answers · asked by Anonymous in Biology

I'm sure i am double checking myself probably because i am tired but how do you do this problem

this is a multiplication problem 56
34

2007-08-28 12:27:45 · 2 answers · asked by coolmesillyme 1 in Mathematics

what is the definition of volcano?

2007-08-28 12:24:52 · 9 answers · asked by Anonymous in Other - Science

I am studying for trig because I am taking it my sophomore year.(next week classes start) But I only know some of it.
Okay, so I know that whole Soh-Cah-Toa rule.
But how do I find the sin,tan, and cos? It says to input the angle like sin(angle) but when I do, the answer doesn't come out correctly. Then is says that sin= o/h, but what if the angle doesn't have lengths?
For ex. these worksheet problems:

2007-08-28 12:23:42 · 2 answers · asked by ihatestuff 1 in Mathematics

2007-08-28 12:21:56 · 13 answers · asked by Anonymous in Astronomy & Space

I am taking an advanced math class this year and its the second day of school and I already have homework up the wall.
Any help will be greatful

Anyway here it is:
Directions: The symbol [x] means the greatest integer not greater than x. If f(x) = [x] + 4, find each value.

1) f(-4)
2)f(-6.3)
3)f(-√3)
4) f(-4 + t)

The next question is:
Directions: Name all values of x that are not in the domain of the given function.

5) f(x) = √x^2 - 9

Thank you for your help and if you could explain it that would be great.

Thanks again!

2007-08-28 12:19:17 · 1 answers · asked by balgne 3 in Mathematics

2007-08-28 12:12:24 · 1 answers · asked by Dhoopy 3 in Chemistry

2007-08-28 12:09:23 · 9 answers · asked by kassie 1 in Mathematics