Science & Mathematics - 4 October 2007

7-3(8t-10)=85
+3 +3
7(8t-10)=88
>distribute<
7x8t = 56t
7x-10 = -70

56t + 70 = 88
-70 -70
56t=18
56t/56 18/56
t= .3

i know this probably isnt correct
im in algebra 1 in case that helps at all?

pleeeese help

2007-10-04 13:08:34 · 4 answers · asked by Anonymous in Mathematics

um 3 questions plz..

1. A square is inscribed in a circle. How fast is the area of the square changing when the area of the circle is increasing at the rate of 1 inch squared / minute?

2. If tan (x +y ) = x then dy/dx is???

3. suppose f(3)=2
f' (3) =5
f'' (3) = -2

then d^2 / dx^2 of (f^2 (x)) at x=3 is equal to

* then answer to that problem is 42 which made me think that how i solved it was wrong..

2007-10-04 13:06:27 · 1 answers · asked by Anonymous in Mathematics

2007-10-04 13:06:16 · 5 answers · asked by Anonymous in Botany

how would i set up the equation??

2007-10-04 13:06:02 · 11 answers · asked by princesskam1 3 in Mathematics

2007-10-04 13:03:36 · 2 answers · asked by Mike D 1 in Earth Sciences & Geology

Angles=

90

75

15


Sides =

100


Find the other sides.

2007-10-04 13:01:16 · 2 answers · asked by zyfoxmaster 3 in Mathematics

Does a strong reducing agent have a high oxidation potential?

2007-10-04 12:57:38 · 1 answers · asked by Anonymous in Chemistry

An object with an intial velocity of 2 m/s upward is in free fall. What is it's velocity 1 second later?

Please answer and explain how you solved.
Thanks

2007-10-04 12:56:17 · 5 answers · asked by Anonymous in Mathematics

Translate th following sentence into in Algebraic equation:
Five times the difference of a number,p, and 6 is 14

2007-10-04 12:55:31 · 15 answers · asked by Andre R. 1 in Mathematics

heres a challenge:

My birthday is may 8th 10 pts to whoever tells me the exact date thats 6 months from my birthday.

2007-10-04 12:55:16 · 5 answers · asked by em 2 in Mathematics

PLEASE HELP

2007-10-04 12:54:39 · 2 answers · asked by Anonymous in Mathematics

2007-10-04 12:53:53 · 4 answers · asked by marissa 2 in Mathematics

If you travelled at the speed of light and turned your headlights on, would you be able to see where you were going?

2007-10-04 12:53:29 · 12 answers · asked by stammer 1 in Astronomy & Space

2007-10-04 12:53:07 · 1 answers · asked by funkee_fresh721 2 in Other - Science

1/2b + 4 = 1/8b + 88

Anyone know?

2007-10-04 12:51:18 · 4 answers · asked by Anonymous in Mathematics

2007-10-04 12:50:32 · 7 answers · asked by michael g 1 in Mathematics

how do u do it? best answers gets 10 points

2007-10-04 12:47:39 · 2 answers · asked by Anonymous in Mathematics

-9(6+x)-2x= -10
+9 +9
(6+x)-2x= -1
-6 -6
x-2x= -7
3x= -7

3x/3 -7/3
x= -2.3

is this right?
im not suree
please help =]

2007-10-04 12:47:23 · 4 answers · asked by Anonymous in Mathematics

This is the question:

There are four integers between 100 and 1000 that are equal to the sum of the cubes of their digits. Three of them are 153, 371, 407. What is the fourth such integer

how do you do it and what is the answer?

2007-10-04 12:45:43 · 1 answers · asked by dotadh 1 in Mathematics

2007-10-04 12:45:29 · 3 answers · asked by Candice T 1 in Earth Sciences & Geology

The question -

An integer n has a square whose tens digit is odd. Find the units digit of n^2

what is the answer and how do you do it?

2007-10-04 12:44:20 · 1 answers · asked by dotadh 1 in Mathematics

could some one explain mass number and what they look like for different isotopes

2007-10-04 12:43:39 · 4 answers · asked by Anonymous in Chemistry

I know it has to do with friction and heat and what not, but I'm wondering about the color of light on this. See, I put two pieces of tape together, and, in the dark, I pulled them apart. They produced a blue band of light at the point where they were being pulled apart. Why is the color of that blue?

2007-10-04 12:42:51 · 1 answers · asked by Anonymous in Other - Science

4 + b > 20 but the less than sign is underlined

2007-10-04 12:41:32 · 13 answers · asked by rockdemon3 1 in Mathematics

just tell me how u got the answer like with synthetic dicvision or something

2007-10-04 12:41:28 · 2 answers · asked by meshru_101 1 in Mathematics

5 pulleys, 2 fixed and 3 movable, are connected by a single cord. What load can an effort of 100N move with this machine. I hope the solution would be in detail for me to analyze.
Next, we hadn't made the experiment but I hope you would directly tell me the answer. Which machine would be likely to have the greatest efficiency?why?
Last, How does the actual mech'l advantage of a simple machine change with the load?
Thank you to the person who answers this. And God Bless you.

2007-10-04 12:40:23 · 1 answers · asked by Ross 1 in Physics

A woman at an airport is towing her 15.0 kg suitcase at constant speed by pulling on the strap at an angle above the horizontal (Fig. P4.40). She pulls on the strap with a 24.0 N force, and the friction force on the suitcase is 10.0 N.

(a) What angle does the strap make with the horizontal?
65.37 degrees
(b) What normal force does the ground exert on the suitcase?
___?____

I already found the angle but how do I solve the 2nd part?? Thank you!

http://books.google.com/books?id=wDKD4IggBJ4C&pg=PA112&lpg=PA112&dq=fig+%22p4+40%22+college+physics&source=web&ots=fnlu-8GTUY&sig=mKHKkKuaFVoOM2kBNN8XHj_VY0k

This link has fig P4.40 on it.

2007-10-04 12:37:57 · 1 answers · asked by redblitz528 1 in Physics

1. a car accelerates constantly. it started at 10 m with a velocity of 15 m/s and ended at 40 m with velocity of 60 m/s, what was the acceleration?
2. a person falls out of a hot air balloon. eyewitnesses reported that it took the person 5 secs. to hit the ground. what was the person's velocity just before they hit the ground?
3. a car with an intitial velocity of 30 m/s slammed on the brakes and skidded to a stop. if the skid marks created by the tires were 15 m long, and the car experienced constant acceleration, what was the car's acceleration while the brakes were applied.
4. if the driver of a car applied the brakes so that the car had an acceleration of -3m/s^2, and the car started out with a velocity of 50 m/s, what was the distance required for the car to come to a stop?

use one of the following equations:
1. V=Vo+at 2. X=Xo+Vo t+1/2at^2
3. v^2=Vo^2+2a(X-Xo)

thank you if you do help......

2007-10-04 12:36:48 · 1 answers · asked by anynomous 1 in Physics

2007-10-04 12:35:46 · 14 answers · asked by Anonymous in Physics

ok these are really simple but my teacher marked these wrong but we get to redo it, so i really want to get this right =]

ok here we go [ btw this is really simple ]

find the mean of
14 14 15 15 15 15 15 15 16 16 16 16 16 16 16 17 17 17 18 19 19 19
((ROUND TO THE NEAREST TENTH))

NEXT........................

find the Lower Quartile and Upper Quartile of ..
13 17 18 20 21 25 26 30

NEXT..

Grade 7 students surveyed to determine how many hours per day they spent on various activties. The results are shown in the circle graph below. About how many hours per day altogether was spent sleeping AND watching tv.

socalizing 13%
watching tv 13%
h.w 8%
eating 8%
sleeping 33%
school 25%



THANK YOU EVERYONE!
[if you could show me how to do it that would be great too. =]

2007-10-04 12:35:03 · 4 answers · asked by Anonymous in Mathematics