Mathematics - 8 October 2007

then a= and b=

can someone show me how to do this

2007-10-08 09:25:00 · 1 answers · asked by Anonymous

Today we were told to revise standard form but some of it I really don't understand. It's probably just a silly misunderstanding but could someone say it in plain and clear.

One of the questions: 52100 in standard form and the answer is 5.21 x 10 to the power of 4.


Our teacher said the dec pl. has to be between 1 - 10. But then wouldn't 52.1 be between one and ten?

Please explain as I have a test!

2007-10-08 09:22:15 · 7 answers · asked by xthedarkladyx 1

2007-10-08 09:19:51 · 11 answers · asked by shawna 2

You may use any of the commonly used operations except 4 factorial. You can ONLY use four 4's. No more, no less. The only digit you can use is 4.

Hint: You can use 4/4, exponents, square root of four, 44, .4, 4 to the square root of 4 power, etc, etc.
The only operation you may not use is 4! (4x3x2x1)

Good luck!

2007-10-08 09:17:09 · 3 answers · asked by ... 2

2007-10-08 09:12:53 · 21 answers · asked by dj 1

I'm confused. If I use the (a-b) squared - my answer should be a^2 - 2ab+b^2..... But - I must be doing something wrong because I don't have the right answer.... Please help!

2007-10-08 09:06:49 · 6 answers · asked by Deb 1

2007-10-08 09:03:03 · 15 answers · asked by dj 1

AB = 2x+7
BC = 3x+5
AC = 5x-4

The perimeter is 58.

Find me x and AB.

2007-10-08 09:01:55 · 9 answers · asked by Yahoo! King 1

Here is the question:
A toy manufacturer is introducing two new dolls, My First Baby and My Real Baby. IN one hour, the company can produce 8 First Babies or 20 Real Babies. Because of demand, the company produces at least twice as many First Babies as Real Babies. The company spends no more than 48 hours per week making these two dolls. The profit on each First Baby is $3.00, and the profit on each Real Baby is $7.50. Find the number and type of dolls that should be produced to maximize profit.

I used F for fthe number of First Babies and R for the number of Real Babies. All I am sure of is that F is greater than or equal to zero, R is greater than or equal to zero and that F is greater than or equal to 2R. I am unsure of the other equations needed to be graphed, since I keep getting the wrong answers. The correct answer is 320 First Babies and 160 Real Babies. How do you get that as a maximum value?

2007-10-08 08:57:27 · 3 answers · asked by Fly Like Jordan 3

where on earth could he be?

the north pole is one place. i need some more places. and south pole doesnt work. challenging, isnt this?

2007-10-08 08:54:26 · 11 answers · asked by Meow* 2

This is one of the math questions that my 8 year old was given for homework. I've tried to help him. I've been on math site after math site - with no luck. Who gives a 3rd grader this kind of question?! I just don't remember math problems being this difficult when I was his age. Can anyone help us?

2007-10-08 08:53:10 · 6 answers · asked by MADS1228 3

2007-10-08 08:52:59 · 10 answers · asked by dj 1

2007-10-08 08:46:34 · 6 answers · asked by alan p 2

2007-10-08 08:43:16 · 9 answers · asked by dj 1

You invest $4075 at 6.3% per annum compounded quarterly. Determine the number of quarters required for your investment to exceed $13150. Round any partial quarter up to the next quarter.

2007-10-08 08:42:19 · 5 answers · asked by Maddie1830 2

Water moves past a 10cm board in 1.3 seconds.
Evaluate and write the FORMULA to figure out how far the water will travel in a second.

Please Help, I forgot the formula -_-

2007-10-08 08:41:26 · 5 answers · asked by ajkid 1

please i will choose you for best answer

2007-10-08 08:39:23 · 11 answers · asked by Anonymous

2007-10-08 08:37:33 · 24 answers · asked by dj 1

The parametric equations of the line of intersection of the two planes
2x+8y+8z=8 and –2x–7y–5z=4
found by Gauss-Jordan elimination are
x= _____+___t
y=______+___t
z=______+___t

2007-10-08 08:34:58 · 2 answers · asked by Anonymous

Let l be the line that passes through the point P=(2,3,9) and is parallel to the line with parametric equations
x= -9+7t
y= 9+5t
z= 8 -9t
The vector equation of l is x=p+td where
p=(___,____,_____)T
d= (___,____,_____)T

2007-10-08 08:32:49 · 1 answers · asked by Anonymous

if the question says.....Degree of the polynomial 8x^2y...

^means power((exponets))

wuld it b 2 or 3 im really confused...

2007-10-08 08:31:11 · 1 answers · asked by Stephen 2

each year in order to save 122000 in 14 years for a child's college expenses? Assume the annual amount is added continuously over the period of each year.

2007-10-08 08:28:16 · 4 answers · asked by simonkf2002 1

What's the answer for the equation:
the square root of 3+4i = a+bi

This is what I got so far:
I squared both sides to get rid of the square root and it becomes:
3+4i = (a+bi)(a+bi).
Then: 3+4i = a (squared) + 2abi - b (squared)
Then: 3+4i = a (squared) + b(squared) + 2abi
So the real numbers equal each other and the imaginary numbers equal each other: a(squared) +b(squared) = 3 and 4 =2ab.

But when I use substitution, I get 4 really weird answers and I'm not sure if they're correct or not.
I got [(+ or -) 2 (+ or -) i] and [(+ or -) 1/i (+ or -) 2]
Are these correct?

2007-10-08 08:26:01 · 2 answers · asked by Anonymous

Given the expression (h-4)/(sqroot of h - 2)
simply by ratinalization and simplify, evaluate the expression for h=4.

i dont understand. can some one help.

2007-10-08 08:24:43 · 2 answers · asked by ♥ AnGeL ♥ 3

this was in the continuity chapter and i don't understand it. i know it is true, but i am not sure how i am supposed to justify.

2007-10-08 08:24:23 · 1 answers · asked by Anonymous

Find a unit vector with positive first coordinate that is orthogonal to the plane through the points
P = (-4, 5, 4), Q = (-1, 8, 7), and R = (-1, 8, 8)
Thanx guys. I have trouble solving it.

2007-10-08 08:23:42 · 1 answers · asked by Anonymous

Proof that, for all z, w an element of C (complex numbers);

| z + w | <= | z | + | w |

(<= means less or equal to).

Thanks for the help.

2007-10-08 08:22:16 · 3 answers · asked by thehill88o 1

what is 'a'

2007-10-08 08:21:52 · 4 answers · asked by Anonymous

Convert this to meters per second.

2007-10-08 08:11:57 · 7 answers · asked by redbeetlebug00 1

2007-10-08 08:06:32 · 3 answers · asked by Anonymous