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741

Telescope optics

A simple telescope has an objective lens of focal length 100 cm and an eyepiece lens of focal length 5 cm. It is used to look at the moon, which subtends an angle of 0.009 rad. What is the diameter read more ..

Guest Jul 15, 2017

751

what ist the needed force to throw up a stone of 1 kg 1 m high

what ist the force needed to throw up a stone of 1 kg 1 m high

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Guest Jul 15, 2017

1046

Log(e) and Log?

What is Log(e) in relation to Log?

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Guest Jul 15, 2017

2036

The area of Alabama is 51,718 square miles and its population is 4,779,736. The area of Missouri is 69,709 square miles and its population i

The area of Alabama is 51,718 square miles and its population is 4,779,736. The area of Missouri is 69,709 square miles and its population is 5,988,927. The average state population density is 87.4 people per square mile. How do the population densities read more ..

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Guest Jul 15, 2017

1295

Repost: Mailbox question (Confusing high school problem)

Question is: In how many ways can 4 postcards be mailed into 3 mail boxes?

This is a topic IGCSE 0606 additional maths: Counting and the binomial expansion; The product principle)
There are 3 unique mail boxes and 4 read more ..

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Guest Jul 15, 2017

1158

Maths Compund Angles Trignometry

cos(pi/7) + (cos(pi/7))^2 - 2(cos(pi/7))^3

heureka ●●●●●●

Guest Jul 15, 2017

1674

+56

Four+circles.jpg

Four+circles.jpg

(Note: above that should be a hyperlink to the diagram...)
read more ..

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Trinityvamp286 Jul 15, 2017

1878

+56

Circles

A circle passes through two adjacent vertices of a square and is tangent to one side of the
square. If the side length of the square is 2, what is the radius of the circle?

need answer and explination as soon as possible read more ..

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Trinityvamp286 Jul 15, 2017

662

statistics

Assume that population means are to be estimated from the samples described. Use the sample results to approximate the margin of error and 95% confidence interval. Sample size equals =100, sample mean equals 76, sample standard deviation equals 13. read more ..

Guest Jul 15, 2017

Jul 14, 2017

950

Find equation through line

find an equation of the liner through (-78,-56) paralled with the line given by -8+52x+97y=0

hectictar ●

Guest Jul 14, 2017

1122

+56

I am trying to solve for (x y)... I have two angles...

I am trying to solve for (x y)... I have two angles...
acute+obtuse
\/ \/
(4x)˚ + (6x+y)˚=180˚ read more ..

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Trinityvamp286 Jul 14, 2017

2515

+4623

help please

The strength of a bar magnet's magnetic field decreases with distance according to what is known as an inverse cube law; multiplying the distance from the magnet by a factor of k divides the magnetic field strength by a factor of .Suppose the magnetic read more ..

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tertre Jul 14, 2017

1025

+166

Graphing & Understanding Linear Equations

Given the equation y = 1/2x + 1....
Is it true that any point on the line is a solution point of the equation?
Is it true that any solution point of the equation is a point on the line?
Please Explain read more ..

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MrPatel Jul 14, 2017

1205

+77

geometry question

Let $AB = 6$, $BC = 8$, and $AC = 10$. What is the area of the circumcircle of $\triangle ABC$ minus the area of the incircle of $\triangle ABC$?

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eileenthecoolbean Jul 14, 2017

661

how is this sloved

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Guest Jul 14, 2017

2105

+77

Another geometry question... Help plz

Quadrilateral $ABCD$ is a square, and segment $AE$ is perpendicular to segment $ED$. If $AE = 8$ units and $DE = 6$ units, what is the area of pentagon $AEDCB$, in square units?

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eileenthecoolbean Jul 14, 2017

1035

+77

geometry help plz?

Find the inradius of $\triangle JKL$ if $JK=JL=17$ and $KL = 16$.

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eileenthecoolbean Jul 14, 2017

824

Exponential change

Sara puts in 13 000$ in the account with the interest rate of 3.5%. How many years does it take before the amount has increased to 20 000$?

The answer is 13 years but I having some trouble finding how to solve the question. Please, read more ..

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Guest Jul 14, 2017

923

I have 5 apples. I will eat 2 of them. How many different pairs of apples can I eat?

Is there a special way for working out these types of questions?

geno3141 ●

Guest Jul 14, 2017

665

Financial models

What rate of interest compounded annually is required to triple an investment in 20 years? The rate of interest required is %? (Round to 2 decimal places as needed)

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Guest Jul 14, 2017

676

Financial models

What rate of interest compounded annually is required to triple an investment in 20 years?
The rate of interest required is %?

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Guest Jul 14, 2017

-1

840

help!!!

uuu
zzz
xxx
:) read more ..

off-topic

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Guest Jul 14, 2017

991

4 postcards be mailed into 3 mail boxes?

Question is: In how many ways can 4 postcards be mailed into 3 mail boxes?
Im extremely confused. How does one do this.

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Guest Jul 14, 2017

824

+27

When is 'choose' used?

I think another name is called: Binomial Coefficient. Like 4 choose 3 = 4! / (3!*(4-3)!)
When would this be used in the real world, if that make sense.

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DeadRight Jul 14, 2017

All Questions ⁺⁰237641 Questions

Telescope optics

what ist the needed force to throw up a stone of 1 kg 1 m high

Log(e) and Log?

The area of Alabama is 51,718 square miles and its population is 4,779,736. The area of Missouri is 69,709 square miles and its population i

Repost: Mailbox question (Confusing high school problem)

Maths Compund Angles Trignometry

Four+circles.jpg

Circles

statistics

Find equation through line

I am trying to solve for (x y)... I have two angles...

help please

Graphing & Understanding Linear Equations

geometry question

how is this sloved

Another geometry question... Help plz

geometry help plz?

Exponential change

I have 5 apples. I will eat 2 of them. How many different pairs of apples can I eat?

Financial models

Financial models

help!!!

4 postcards be mailed into 3 mail boxes?

When is 'choose' used?

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