Mathematics - 6 September 2007

The temperature at 0800 is -3 degree celsius
The temperature at 1400 is 15 degree celsius.

(a) Find the difference between the two temperatures.

The answer is 15 - (-3) = 15 +3
= 18 degree celsius.

Why must I take the temp at 1400 minus the temp at 0800 instead of the other way round which is -3 - (15) = -18? Explain please?

(b) Assuming that the temp rises at a steady rate, find the temperature at 1220.

Please show your workings clearly and explain, thanks a lot! :)

2007-09-06 18:07:37 · 4 answers · asked by ♪£yricảl♪ 4

show best answer

2007-09-06 18:05:12 · 6 answers · asked by The Prophyt 2

2007-09-06 17:56:26 · 10 answers · asked by Anonymous

Okay, I feel REALLY stupid for asking this, but I just can't figure it out. I need to perform a calculation on a number in order to get the desired result, but every time I try, I keep getting the opposite of what I want.

Here are some test examples:

Number = 5,000
Result = 200

Number = 10,000
Result = 100

Number = 20,000
Result = 50

Number = 40,000
Result = 25

etc.

Can anyone think of a formula to convert the number into the result?

Thanks!

2007-09-06 17:55:59 · 5 answers · asked by Anonymous

When it comes to calculus, domain and range confuse the heck outta me! Could someone explain/help me with this problem?

f(x) = tan^-1x from -10≤x≤10

Also, I need to find f^-1(x). Aaaah help!!

Thank you!

2007-09-06 17:45:34 · 4 answers · asked by Anonymous

2007-09-06 17:43:51 · 5 answers · asked by amj4_ever 1

show work best

2007-09-06 17:32:43 · 3 answers · asked by The Prophyt 2

2007-09-06 17:27:30 · 8 answers · asked by badjazz911 1

why are the answers different just because one has parenthesis?

2007-09-06 17:26:50 · 5 answers · asked by azncutie45 2

2007-09-06 17:22:32 · 8 answers · asked by K-Mill 1

Factor - Product
Divisor and Dividend - Quotient
? - Sum

2007-09-06 17:20:14 · 5 answers · asked by bob 2

thanks guys for anwering my previous problem!
but i forgot to add this one:

Solve.

1)x(x-1)=x

2007-09-06 17:19:54 · 3 answers · asked by iltwym_7591 2

#12:

Prove this conjecture:

Let f(x) be a function defined on the positive integers such that:

f(x) = x/2 if x is even
f(x) = (3*x+1)/2 if x is odd

Now I proved all the previous ones, but I need inspiration on this one. My teacher will give me extra credit on a test if i solve it, so help please!

2007-09-06 17:19:32 · 2 answers · asked by Anonymous

2007-09-06 17:16:40 · 0 answers · asked by Anonymous

jsut wanna make sure the answer is x=83 1/3

2007-09-06 17:14:11 · 12 answers · asked by Anonymous

5*2875*8954/ 55885*9= X
???

2007-09-06 17:12:23 · 8 answers · asked by Anonymous

2007-09-06 17:07:13 · 2 answers · asked by help4x 1

I'm slow.. can anyone do this one and show me the steps so I know how it should be done..

Simplify:

3x - (5x+4)

2007-09-06 17:02:26 · 9 answers · asked by Anonymous

Solve.

a) x * x = 1

b) x * x = x
the answer is supposed to be {1, 0}??
can anyone tell me why it's {1, 0}?

c) x(x-1) = x(x+1)
the answer is {0}

2007-09-06 17:01:30 · 7 answers · asked by iltwym_7591 2

2007-09-06 16:54:16 · 6 answers · asked by Anonymous

2007-09-06 16:51:37 · 5 answers · asked by TAMSEY W 1

2007-09-06 16:48:39 · 10 answers · asked by animalhouser07 2

2y+x=4

Can you please explain the steps...

And this 1... like multiplying exponents

2007-09-06 16:45:59 · 7 answers · asked by ♦Swine♣Flu♠Mutant♥ 3

I'm having a bit of trouble on my calculus worksheet, can someone explain to me how to simplify sin²x-1 and cos³y+cos(y)sin²(y)? Thank you!

2007-09-06 16:44:55 · 3 answers · asked by Anonymous

I an fairly sure that I did the solving right but im not sure if I flipped the signs correctly. If anyone would briefly look over some of these and tell me if I have the inequality signs the right way I will greatly appreciate it.

1) -12> 24x
-1/2> x


2) -7k< 63
k> -9

3)8a -15 > 73
a> 11

4) 57 -4t > 13
t<11

5) -18 -5y > 52
y<-14

6) 14 -4y > 38
y < -6

7) 4(x+3) < 44
x< 8

8) 2 (m-3) +7 < 21
m<10

9) 4(n-2) -6 > 18
n>8

10) 9x+18>9x -27
x> -2.5

11) 6x -13 < 6(x-2)
x< 1/12

12) -12x+60+12x< 180
x= any real numbers

13) -21x+49 +21x>50
Not possible

2007-09-06 16:39:44 · 3 answers · asked by Hi 3

2007-09-06 16:39:34 · 3 answers · asked by specialone18 5

how do you do this?

2007-09-06 16:38:17 · 8 answers · asked by Anonymous

2. how do you evaluate -7 - 'a' for 'a' = -6

2007-09-06 16:37:41 · 1 answers · asked by animalhouser07 2

I really dont know how 2 do this. Please help.

2007-09-06 16:36:53 · 1 answers · asked by Anonymous

2007-09-06 16:30:54 · 12 answers · asked by :() 1