Sorry, but I calculate again with my computer, and the result is: 75,36 cubic inches. That's my idea.

Lê Quốc Trần Anh was wrong, the correct answer is : 

\(75,3982236....\approx75,4\) (cubic inches)

The area of the label is: \(\left(4:2\right)^2\pi.6=75,36\left(cubic-inches\right)\)

So the area of the label is: \(75,36cubic-inches\)

At a speed of 50km/h, the time to complete is : 

\(t=\dfrac{s}{t}=\dfrac{900}{50}=18\left(hour\right)\)

Change : 900 km = 900. 0,62137 = 559.233 miles 

So , the velocity calculated by miles/hour is : \(\dfrac{599.233}{18}=33.29.....\approx33.291\)  (miles/hour)

With the time complete in 3 hours, the velocity is : \(\dfrac{599.233}{3}=199.744\) (miles/hour)

Hence, there are 199.744 - 33.291 = 166.453 (miles/hour) faster you must average while driving.

I don't very good at English

But I will study English much

Too can do some hard questions

One half \(=0,5\)

From \(0,5\rightarrow2,25\)

The number is two-thirds of the distance from 0,5 to 2,25 is \(\left(2,25-0,5\right)\cdot\dfrac{2}{3}=\dfrac{7}{6}\)

So the number is \(\dfrac{7}{6}\left(=1\dfrac{1}{6}\right)\)

There are : 

\(1+2+3+..+99=\dfrac{99.100}{2}=99.50=4950\) (7s) and 99 9s before the hundredth 9, so the answer is : 4950 + 99 = 5049

The perimeter of the larger decagon is: \(76:\dfrac{1}{2}=152\left(cm\right)\)

ANSWER: 152cm

We can easily prove that EFGH is a square

\(\Rightarrow EH=EF=\dfrac{HF}{\sqrt{2}}=\dfrac{AB}{\sqrt{2}}=\sqrt{2}\left(m\right)\)

The area of the sector EFH is : \(\dfrac{\left(\sqrt{2}\right)^2\pi}{4}=\dfrac{\pi}{2}\left(m^2\right)\)

\(S_{EFH}=\dfrac{\left(\sqrt{2}\right)^2}{2}=1\left(m^2\right)\)

The answer is : \(2\left(\dfrac{\pi}{2}-1\right)=\pi-2\approx1.14\)

Because AP=2PB and AB=10-(-2)=12 so AP\(=\dfrac{AB}{1+2}=\dfrac{12}{3}=4\)

So the answer is:(6,7)

B A 10 8 -2 P

Because AP=2PB and AB=10-(-2)=12 so AP=AB1+2=123=4

So the answer is:(6,7)

No one can climb because coconut trees do not have bananas

When Simba left, the distance from Simba and Mary is 55 miles.

Simba travel faster than Mary the number of mph is:

65-55 = 10 (mph)

So the time Simba catches up to Mary is:

55 : 10 = 5,5 ( hours)

Or 14 : 30 from the beginning