Mathematics - 1 November 2007

1.
2 cars leave the same place at the same time, but drive in opposite directions along a straight road. 1 car averages 55mi/h and the other 65mi/h. in how many hours will they be 250 miles apart?
a. about 1.7 hours
b. about 2.1 hours
c. about 3.8 hours
d. about 4.5 hours

2.
helen rode her bike for 2 hours at a constant speed of 6km/h. she took the same route to come home but increased her speed by 6km/h. how far did she ride?
a. 36km
b. 24km
c. 18km
d. 4.5km

3. A helicopter leaves an airport and flies south 180mi/h. 30 minutes later, an airplane leaves the airport and follows the same route as the helicopter, only at a higher elevation. the airplane is flying 330mi/h. how many minutes will it take the airplane to catch up to the helicopter?
a. 12
b. 24
c. 40
d. 48

ps: this is not my homework but a review for a midterm coming up. if u could explain how u got the answers it be great. thanks

2007-11-01 07:45:45 · 8 answers · asked by Anonymous

need details of how you came up with the answer. thank you

2007-11-01 07:38:07 · 8 answers · asked by Dixie 1

need details as to how you get the answer to this question.

2007-11-01 07:35:52 · 6 answers · asked by Dixie 1

The perimeter of a right angled triangle is 70 and the sum of the squares of its three sides is 1682. Find the lengths of the three sides

2007-11-01 07:11:48 · 6 answers · asked by rma 1

if x -> infinity and f(x)=(square root of (9x^6 - x) ) / (x^3 +1)

2007-11-01 07:06:06 · 3 answers · asked by Moi 2

Please help; I am stuck.

2007-11-01 07:01:45 · 5 answers · asked by RogerDodger 1

2007-11-01 06:55:34 · 16 answers · asked by Anonymous

Given the definition of a powerful number (a number where, for every prime factor p, p^2 is also a factor), I would think all powerful numbers would be of the form m = (ab)^2 where a and b are integers and at least one is a prime number. However, every definition I have seen for powerful numbers states the form as m = (a^2)(b^3). Why?

2007-11-01 06:52:49 · 3 answers · asked by Winkerbean 2

Question: How many legs are there in the bus?

You are looking for a number, not words! It's not a trick question...

Can you figure this one out...

- There are 7 girls on a bus

- Each girl has 7 backpacks

- In each backpack, there are 7 big cats

- For every big cat there are 7 little cats

How many legs are there in the bus?

2007-11-01 06:51:25 · 2 answers · asked by RC 1

i need to know how to do it soon as possible

2007-11-01 06:49:25 · 6 answers · asked by Anonymous

Does anyone can tell me an answer? I cannot solve it!

2007-11-01 06:41:24 · 6 answers · asked by Anonymous

z=(3+i)^3
I can't find any examples of this variety of problem in this format, where the second number is an irrational/complex number. Can anyone explain the steps in solving a problem like this please?

2007-11-01 06:41:08 · 3 answers · asked by Anonymous

y=-4y
3x+2y=20

2007-11-01 06:40:42 · 7 answers · asked by butterflt 1

maths

2007-11-01 06:34:42 · 5 answers · asked by Anonymous

1. What is the equation for the parabola whose vertex is (3,-6) and focus is (4,-6)?

2007-11-01 06:31:37 · 1 answers · asked by Anonymous

Heres what I said
2sinxcosx=sin2x isn't that a rule?
then y=sin2x
then the derivative of that is
2cos2x
right
or do u have to do it as a product?

2007-11-01 06:24:22 · 5 answers · asked by limallama 4

I am considering taking a college geometry course. I am a little concerned because I haven't had very much high school geometry(probably 2 months worth). I wanted to know if anyone has taken college geometry and whta their thought on it are? Would someone like me be able to handle it?

2007-11-01 06:20:10 · 3 answers · asked by aba 2

I am writing a lesson on the unit circle and I understand its various properties concerning the trigonometric functions (ie. the sin of an angle is equal to the y coordinate of the point at which the terminal side of the angle intersects with the circle). However what other unique features does the unit circle exhibit? How else can it be used in a lesson? Where is the usefullness of the unit circle applied in practical applications?
Thank You for all your help in advance!

2007-11-01 06:15:48 · 2 answers · asked by Joseph P 4

What would be you're expected success rate? Would it be something other than 1 in 3?

2007-11-01 06:13:16 · 9 answers · asked by Justin H 7

Click the link to see the question and the multiple choice answers. First person to answer with the right answer will get 5 stars?





http://tinypic.com/view.php?pic=6b9pnck&s=1

2007-11-01 06:10:02 · 1 answers · asked by Anonymous

Let x equal the # of them who score perfect on sat.
What is p(x) for x =0,1,2,3?

2007-11-01 06:01:25 · 1 answers · asked by Anonymous

2007-11-01 05:35:14 · 6 answers · asked by . 1

ok well metrix a= (in brackets i don't know how to put them up)
a b
c d

metrix b=
e f
g h


now the question-
A does not have an inverse B has an inverse
Column A
ad-bc


Column B
eh-fg


1. the quantity in column a is greater
2. the quantity in column b is greater
3. the two quantities are equal
4. the realationship cannot be determined on the basis of the information supplied.




I am so lost on this question i had no clue how to solve it should i assign numbers to the letter and then work it out. can someone please help me?

2007-11-01 05:26:18 · 5 answers · asked by Amber 1

help me

2007-11-01 05:23:00 · 7 answers · asked by . 1

2007-11-01 05:16:00 · 10 answers · asked by amylc06 1

1 (x^2)z + yz - xy = 10

2. (x^2)/4 + (y^2)/9 + z^2 = 1

Just have to determine and prove whether or not z is a function of x and y. I'm kind of stumped as there are no examples I could find anywhere.

2007-11-01 05:15:02 · 5 answers · asked by jerseyshore 2

2007-11-01 05:10:28 · 6 answers · asked by Anonymous

2007-11-01 05:09:34 · 6 answers · asked by Anonymous

Also why find the median and IQR

2007-11-01 04:58:08 · 7 answers · asked by Anonymous

A Pteri with a light appetite could not finish his Rainbow Melt Pizza. In fact, he could only eat exactly half of it.

If the diameter of the pizza was 50cm, and the half-pizza was a perfect semicircle, what is the area of the smallest square box, in square centimetres, that could contain the half pizza? Please disregard the thickness of the box, round to the nearest whole number, and please only submit a number for your answer.

Any help on how to solve this would be great, as my math skills are a bit rusty.

2007-11-01 04:56:33 · 3 answers · asked by Anonymous