Mathematics - 5 December 2007

In this magic square, A, B, and C are single-digit numbers, 2A means twice A, etc. Every row, column, and both diagonals add up to the same total. What is that total? Solve for each letter. (4 answers)

2A C 2C

A+2B A+B A

B 3A 2B

2007-12-05 11:51:16 · 2 answers · asked by Anonymous

Hi. I have a really important math assignment due tomorrow. My teacher was absent when we were given it and he hasn't done any problems like this in class (nor are there any similar ones in the book). So, I'm clueless as to where to start. I'm not looking for someone to just tell me the answer, I really want an explanation. Help?

"A reflecting telescope has a parabolic mirror for which the distance from the vertex to the focus is 26 feet. If the distance across the top of the mirror is 72 inches, how deep is the mirror in the center?"

My immediate thought is that the 72 inches should be converted to 6 feet before starting the problem, but after that I've got nothing.

2007-12-05 11:49:28 · 1 answers · asked by Aldo 1

Write an equation of the line containing the point (3,-2) and
a). perpendicular to the line 3x+4y=5
b). parallel to the line y=2x+5

2007-12-05 11:44:25 · 2 answers · asked by 23344 2

2007-12-05 11:31:10 · 4 answers · asked by BlackMamba 5

tanΦ=3
pi<0<((3pi)/2)

the answer is [(square root(10))+1]/ -3, but i don't know how to get the answer

2007-12-05 11:26:31 · 1 answers · asked by someone 1

2007-12-05 11:15:27 · 2 answers · asked by lazeriz420 1

y = -x² + 8x - 20

and if possible, reduce it...

2007-12-05 11:08:49 · 2 answers · asked by Juan C 6

Express the trinomial as the product of its greatest monomial factor and another polynomial

2007-12-05 11:08:45 · 4 answers · asked by Jazz 2

i need help finding the domain and solving
1. 3 log(base 5)x=1.5

and find the domain in

y=log (2-x)

all procedure please
and thank you

2007-12-05 11:03:15 · 3 answers · asked by confused20077 3

1. Mrs. hunt runs a child care facility in her home. she is currently watching two children, Chase Kim and Kerry Oh.
Mrs. Kim picks up Chase late about 20% of the time and Mr. Oh picks up Kerry late about 30% of the time. on any day, what is the probability that both children will be picked on time?

2. what is the probability that both children will be picked up late?

please show work and state the final answer clearly

2007-12-05 11:03:07 · 1 answers · asked by Anonymous

How would you find the apothem and perimeter if you were just given the area of 800 square centimeters?

2007-12-05 11:03:03 · 1 answers · asked by L337est 4

A salt content in the Caspian Sea is 0.13 kilograms for every liter of water. How many kilograms of salt are in 70 liters?

2007-12-05 11:02:12 · 4 answers · asked by amandanl95 2

She determies that the angle of elevation of the kite is fifty eight degrees. What is the height of the kite from the ground?

2007-12-05 10:55:18 · 7 answers · asked by Anonymous

Solve each equation over the set of complex numbers.

If f(x)=3x+5 and g(x)=x-1, find f[g(-1)].

I don't understand how to do this problem.

2007-12-05 10:55:03 · 2 answers · asked by Anonymous

(13)/(x^2)+1=(6)/(x)
Solve for x, express in simplest a+bi form.
i knw how to solve for x (well i thought i did ) but i dont get where the i is coming from cuz there is no negative square root. Please help

2007-12-05 10:45:25 · 1 answers · asked by help 1

1) profit for company: P(x) = -2.9x^2 + 28.4x - 40.2
x is number of years and P(x) is profit in thousands of dollars.

(a) Find year the company saw profit.
(b) Find the year the company hahd the highest profit and what profit was.
(c) Find the year the company begins to lose money,


- I totally forgot how to do this stuff but remember a little. If someone could remind me what to do to start it off, I can help him out. THANKS!! :)

2007-12-05 10:31:38 · 3 answers · asked by Anonymous

sqrt of x times sqrt of x =?

2007-12-05 10:17:22 · 4 answers · asked by Desilicious 1

The half life of plutonium-234 is 9 hours. If 50 milligrams is present now, how much will be present in 4 days? Our book has the formula, I just dont know how to rearrange the problem/numbers to work out how the book says. Please help!

2007-12-05 10:11:04 · 2 answers · asked by Anonymous

2007-12-05 10:10:28 · 4 answers · asked by Anonymous

1: Steven has 3 pounds of brand 121 nuts that sell for $2.23 a pound. He also has brand 330 nuts that sell for $1.75 a pound. If he wants a mixture of nuts that sell for $1.93 a pound, how many pounds of brand 330 should he add?






3 pounds
5 pounds
6 pounds
8 pounds


2: Brianna has 2 pounds of brand 176 nuts that sell for $3 a pound. She also has brand 391 nuts that sell for $1.74 a pound. If she wants a mixture of nuts that sell for $2.58 a pound, how many pounds of brand 391 should she add?






2 pounds
1/2 pound
1 pound
3 pounds


3: Mr. Lowe bought some three-cent stamps and some two-cent stamps. The total cost was $8.90. How many stamps of each kind did he buy if the total number was 345 stamps?






200 three-cent and 145 two-cent
175 three-cent and 170 two-cent
145 three-cent and 200 two-cent
150 three-cent and 195 two-cent


4: A bank teller has a package of five-dollar bills and a package of ten-dollar bills. The total value is $1110. How many bills of each denomination has he, if the total number of bills is 142?






80 fives and 62 tens
63 tens and 79 fives
42 tens and 100 fives
80 tens and 62 fives


5: How many pounds of coffee selling for $2.25 a pound should be added to eight pounds of coffee selling for $3.75 a pound to create a blend, which will sell for $3.45 a pound?






1 pound
2 pounds
3 pounds
4 pounds

2007-12-05 10:07:07 · 3 answers · asked by Est.1992 6

its
y=1.5x+5
can i even solve for y?
please help!

2007-12-05 10:06:27 · 5 answers · asked by Anonymous

x + 2y – z = -2
3x + 4y + 4z = 5
2x + 3y + 2z = 2

2007-12-05 10:04:26 · 1 answers · asked by jared r 1

2007-12-05 10:01:47 · 10 answers · asked by Anonymous

Determine the number of ordered pairs, (p,q) so that p and q are chosen from the set {1, 3, 5, 7.........., 1999} and p>q.

Most thoroughly explained gets the 10. =)

2007-12-05 10:00:32 · 2 answers · asked by Sunrayye 5

2007-12-05 09:55:55 · 11 answers · asked by Paul T 1

21x + -12
_______________
(3x + -2) + (2 + -3x)

The line represents division. So 21x + -12 divided by the 3x + -2. etc

2007-12-05 09:55:32 · 4 answers · asked by Anonymous

x^2 -3x-7=0

Basically I don't know if I should add or subtract the square root of b squared.
Please Help!

2007-12-05 09:43:57 · 2 answers · asked by Lee 4

Can't get the computer to let me put in the exponent.

2007-12-05 09:40:43 · 6 answers · asked by TAT 7

At 7:00 Joe starts jogging at 6mph. At 7:10 Ken starts off after him. How fast must Ken run in order to overtake Joe at 7:30? The teacher uses a chart. We know D doesn't matter. We know time for Joe is 1/2hr and for Ken is 1/3hr. We do not know what formula to use for rate for each of them to figure d=r x t. Thank you!

2007-12-05 09:37:02 · 3 answers · asked by imok42day2003 1

I know x=1/2^3, but can I simplify it more?
How do I simplify it.

2007-12-05 09:30:50 · 6 answers · asked by Anonymous