The answer is:

 \(\dfrac{92.12+10.87}{12+10}=\dfrac{987}{11}\approx89,72\)

We have :

\(\dfrac{92.12+10.87}{12+10}=\dfrac{987}{11}\)≈ 89,72

So,the answer is : 89,72
 

The answer is:

 $\frac{92.12+10.87}{12+10}=\frac{987}{11}\approx 89,$$72$

ANSWER: 

The probability that the nickel comes up heads is 1/2. The probability that one or more of the other two coins comes up heads is 3/4. The probability that at least two heads come up, with one of them being the nickel, is 1/2 × 3/4 = 3/8.

a+b+c=50
The solid has the greatest possible volume when a=b=c=\(\dfrac{50}{3}\)=16,(6)(cm) (AMGM)
Since a,b and c are integers, a=16(cm), b=c=17(cm). V₁=abc=16.17.17=4624(cm³)

The least possible volume occurs when a=b=1;c=48; V₂=abc=1.1.48=48(cm³)

So the difference is V₁-V₂=4624-48=4576(cm³)

Oh, I forgot to put "(cm)" on the fourth line 

4 x 4 + 4 x 4 + 4 + 4 + 4 \(\div\) 4 + 4 \(\div\)4  = 42

I don't need any luck!

17x - 85 = 85 - 17x

<=> 17x + 17x = 85 + 85

<=> 34x           = 170

<=> x               = 5

17x - 85 = 85 - 17x

<=> 17x + 17x = 85 + 85

<=> 34x           = 170

<=> x               = 5

S= (3+5)x2:2=8(m2)

The area of this shape is:

( 3 + 5 ) x 2 : 2 = 8 ( m² )

Answer: ... 

Trapezoidal area is:

     \(\dfrac{\left(3+5\right)\times2}{2}=8\left(m^2\right)\)

                          Answer : 8 m² 

This article is too easy 

We see: \(4triangles=1big-square.\)

The area of the big square is: \(\left(1:2\right).4=2\left(square-unit\right)\).

So the answer is: \(2square-unit.\)

P/s: This question is asked before.