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In math term it's "Pi" 

Pi= 3.14

Or...

"The symbol used by mathematicians to represent the ratio of a circle's circumference to its diameter is the lowercase Greek letter π"

Can you tell us your problem?

Cos 2theta = -4/5

ARCcos2 theta = arcos (-4/5)

2theta = 143.13 degrees

theta = 71.565 degrees      BUT this is in the WRONG range of  90 - 135     SO we need to find the value in the second quandrant which corresponds to 71.565

180 - 71.565 = 108.435 degrees

What is 10:30-8:10

I assume you want to calculate the time elapsed between 10:30-8:10. If that is the case, you should always specify whether it is AM or PM. At any rate, it doesn't matter: I'm going to assume that it is 10:30AM to 8:10PM = 9 hours and 40 minutes. If that is not the case, then specify it correctly next time.

This is a calculator site. Use it. 

You do realize this is a calculator site ? Nevertheless, it's 44.

Hard to tell. Depending on when he left, in what direction, and how he travled, we could limit the options.

Depending on where your located. It could be the sky. or ceiling. Maybe even something else ...

Mexico

They are a unit of measurement for an angle. They are defined so that the length of an arc diveded by the radius equals the angle in radians.

The cat's potential energy before jumping is:

\(PE=mgh\)

\(PE=5\times9.81\times3\)

\(PE=147J\)

This will all be transferred to kinetic energy just before the cat hits the floor.

\(KE=\frac{mv^2}{2}\)

\(147=\frac{5v^2}{2}\)

\(v=7.67m/s\)

The formula for kinetic energy is

\(KE=\frac{mv^2}{2}\)

\(1,850=\frac{12v^2}{2}\)

\(v=17.6m/s\)

Use the formula:

\(v^2=u^2+2as\)

Where v is final velocity, u is intitial velocity, a is acceleration, and s is distance.

v = 0 because the ball will stop moving upwards as it reaches it's peak height.

u = 12m/s as given in the question.

a = -9.81m/s/s because gravity is the force acting against the ball.

s is what we want to find.

\(0^2=12^2+2\times-9.81\times s\)

\(s=7.3m\)

This question may have been a joke, but it takes extensive proof to prove simply sums like this. For example, in Russel and Whitehead's "Principia", it took over 360 pages to prove 1+1=2.

Find the area of a regular hexagon with apothem length of 5 centimeters

a = apothem

a = 5 cm

\(\begin{array}{rcll} \mathbf{ A_n } & \mathbf{=} & \mathbf{ n\cdot a^2 \cdot \tan( \frac{180^{\circ}}{n} ) } \end{array}\)

hexagon: n = 6

\(\begin{array}{rcll} A_6 &=& 6\cdot a^2 \cdot \tan( \frac{180^{\circ}}{6} )\\ A_6 &=& 6\cdot 5^2 \cdot \tan( 30^{\circ} ) \qquad &| \qquad \tan( 30^{\circ} )=\frac13 \cdot \sqrt{3} \\ A_6 &=& 6\cdot 5^2 \cdot \frac13 \cdot \sqrt{3} \\ A_6 &=& 2\cdot 5^2 \cdot \sqrt{3} \\ A_6 &=& 2\cdot 25 \cdot \sqrt{3} \\ A_6 &=& 50 \cdot \sqrt{3} \\ A_6 &=& 86.6025403784\ \text{cm}^2 \\ \end{array}\)

The area of a regular hexagon with apothem length of 5 centimeters is \(86.6\ \text{cm}^2\)

4900000000000

 Sorry Guest, you got the wrong numbers too!      

CORRECTED (DUE TO USING  4350800 MISTAKENLY INSTEAD OF 43508000)

29.2 /4350800  =  100/x

x = 100/29.2  * 43508000 = 149,000,000  sq km = Earth's surface total area  (land surface is given as 43508000)

As a ratio: (TO FIND WATER SURFACE)

70.8/29.2  =  x/ 43508000

x =  70.8/29.2   * 43508000  =  105,492,000 sq km   is the water surface area

CHECK:  TOTAL AREA - LAND AREA = WATER AREA

                149000000 - 43508000 = 105,492,00  sq km                 OK!  Finally !

-6/-5. No, you cannot reduce it, but you can turn into a mixed fraction:

=6/5=1 1/5.

You added in an extra one.

It is $852,185.81, or Eight hundred fifty-two thousand one hundred eighty-five dollars and eighty-one cents.

Learn to use the calculator here.

What is 1.21777064382 as a fraction=1 674/3095 approximately.