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0

Sorry
4*sqrt(2)+7*sqrt(2)-3*sqrt(2)

GuestJan 25, 2013

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GuestJan 25, 2013

Jan 24, 2013

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Slow cashier works at - 1 Customer per 3 minutes.
Faster cashier works at - 1 Customer per 2 minutes.

So, every 6 minutes, both cashiers will serve exactly 5 customers.
(6 is the lowest common denominator for 3 and 2)

20 divided by 5 = 4.

4 x 6 = 24.

Between the both of them, it will take 24 minutes to serve 20 people.

In that 24 minutes, the slow cashier will serve 8 of the 20 customers.
and the faster cashier will serve the remaining 12.

GuestJan 24, 2013

Jan 23, 2013

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admin:
[input]x^2 + -14x + 45 = 0[/input]

GuestJan 23, 2013

+3146

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[input]x^2 + -14x + 45 = 0[/input]

adminJan 23, 2013

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How to Measure a Cylinder

Radius=r
pi = 3.14159 (approx.)
Area=A
Height=h
Volume=v
First calculate the area of the circle: A=pi*r*r
Then multiply by the height to attain volume: v = A*h = pi*r*r*h

GuestJan 23, 2013

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Step 1: Add up the numbers in your given data set. For example, let’s say you were given a set of data for trees in California (heights in feet):

3, 21, 98, 203, 17, 9

Add them together:

3 + 21 + 98 + 203 + 17 + 9 = 351

Step 2: Square your answer:

351 × 351 = 123,201

…and divide by the number of items in your data set. We have 6 items in our example so:

123,201 / 6 = 20,533.5

Set this number aside for a moment.

Step 3: Take your set of original numbers from Step 1, and square them individually this time:

3 × 3 + 21 × 21 + 98 × 98 + 203 × 203 + 17 × 17 + 9 × 9

Add those numbers (the squares) together:

9 + 441 + 9604 + 41209 + 289 + 81 = 51,633

Step 4: Subtract the amount in Step 2 from the amount in Step 3.

51,633 – 20,533.5 = 31,099.5

Set this number aside for a moment.

Step 5: Subtract 1 from the number of items in your data set. For our example:

6 – 1 = 5

Step 6: Divide the number in Step 4 by the number in Step 5. This gives you the variance:

31,099.5 / 5 = 6,219.9

Step 7: Take the square root of your answer from Step 6. This gives you the standard deviation:

√6,219.9 = 78.86634

GuestJan 23, 2013

+3146

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[input]expand((a+b)^2)[/input]

adminJan 23, 2013

Jan 22, 2013

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si lo eres de todas y yo creo que 100 por cientoooooo besito besito muac muac xoxo

GuestJan 22, 2013

Jan 21, 2013

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GuestJan 21, 2013

Jan 20, 2013

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if a stands for acceleration, meters per seconds squared (m/s²)

GuestJan 20, 2013

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127.38х100/309=41.2%

GuestJan 20, 2013

Jan 12, 2013

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value in 2002 = v(2002) = 9220000

value in 2003 = v(2003) = v(2002) - .112 * v(2002) = v(2002) * (1 - .112)

value in 2004 = v(2004) = v(2003) - .112 * v(2003) = v(2003) * (1 - .112) = v(2002) * (1 - .112)^2

v(2005) = v(2002) * (1 - .112)^3

v(2009) = v(2002)*(1-.112)^7 = 9220000*(.888)^7 = $4,014,409.59 (approx.)

so the equation you seek is v(year) = $9220000*(.888)^(year-2002)

GuestJan 12, 2013

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for tan^2(angle) can you use: tan(angle) x tan(angle) ?

GuestJan 12, 2013

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to change back-and-forth between positive and negative, click on the (+-) button before you enter a number. after you enter the number, but before you enter an operator, you can click on the (+-) button again to change the sign again - as many times as you want.

GuestJan 12, 2013

0

the basic formula for arithmetic sequence is a(n) = a(1) + (n-1) * d

the basic formula for arithmetic series is s(n) = ((a(1) + a(n))/2) * n

given s(3) = 15 and s(7) = 63. plugging in all of the known quantities into s(7) - s(3) gives

a(7) - a(3) = 8. plugging all values into this gives 4 * d = 8 or d = 2.

given s(3) = (a(1) + a(2) + a(3)) = 3 * a(1) + 3 * d = 3 * a(1) + 6 = 15 or a(1) = 3.

with a(1) = 3 and d = 2, we can get a(20) = a(1) + 19 * d = 3 + 38 = 41.

given a(1) and a(20), we can get s(20) = ((3 + 41)/2)*20 = 22 * 20 = 440.

GuestJan 12, 2013

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as you know, elena, to write this number (1 followed by a googol of zeros) it would take longer than the age of the universe and more paper (or whatever medium) than would fit in the universe, but i will get you started and wish you good luck...
10

GuestJan 12, 2013

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under standard conditions: pH + pOH = 14, so pOH = 14 - pH or pOH = 10.1 when pH = 3.9

GuestJan 12, 2013

Jan 11, 2013

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If it's times is 78.

GuestJan 11, 2013

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Is that times? Or raised to a power?

GuestJan 11, 2013

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No worries the answer is 78.

GuestJan 11, 2013

Jan 10, 2013

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(21-2X) * ((30-2X)/2) * X = (21-2X) * (15-X) * X = (315 - 30X - 21X + 10X^2) * X = (10X^2 - 51X + 315) * X = 10X^3 - 51X^2 + 315X

GuestJan 10, 2013

Jan 9, 2013

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3.33333333333333

GuestJan 9, 2013

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cube root of -162:
negative 5.4513617785
didn't find the other one

GuestJan 9, 2013

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angles are complementary when their sum is 90 degrees.

let's call your two (complementary) angles x and y.

we know two things about x and y:

1. x + y = 90

2. y = 29 * x

we can combine these two facts - one way is

x + y = x + (29 * x) = 30 * x = 90 or x = 3 degrees. if x=3, then y=29*3=90-3=87 degrees.

GuestJan 9, 2013

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