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“Worms” answer

question 1 :

(17 x 33) / 100 = 5.61 5.61 x 7 +17 = 56.27 After 7 weeks there are nearly 56 worms.

Question 2 :

999 = 5.61x+ 17 999 - 17 = 5.61x x = 982 / 5.61 x = 175.04 There will be 999 worms after 175 weeks.

Question 3 :

9 x 6 x 6 = 324 After 1 day, birds eat 324 worms. 3 x 324 = 972 If they begin eating at sunday, wednesday they should have eaten 972 worms.

Posted in Group5.

answer two

  • There is +1 for the years and approximatly +17 for the people.

- The best equation is 17x+y.

- There will be 5670 people in Denmark in 2020.

Posted in Group7.

Re exercise of geometry

Hello guys, it's a new version of the exercise of geometry. 
We hope that it will be more clear. 
If you need some helps, make a comments.

Take a lead pencil and draw the figure described below :

-Firstly draw an equilateral triangle ABC, 
the sides have a length of 10cm.

-Draw the height of [AB]. 
Extend the height, it must be a line. 
The instersection of the height and [AB)is H. 
The height is also called (HC).

-Then do all the bisectors of the triangle.

-Draw a circle which has as 
center the intersection of the bisectors. 
The circle is called F, with a radius of 2cm.

-After, draw another circle, F', 
with C as center and for radius [HC].

-F' cut (HC) to the point N. 

-Now draw a new circle F'' 
with the same diameter that F and with N as center.

-Finally you must erase the bisectors and F'.

You have finish. 


Question bonus : Now try to find what this figure represent. 
An indication, we are 37 hours in.

Good luck!=D

Posted in Group5.

answer exercise math

Calculate X : tan 25° = x/1000

x = tan25° * 1000

x = 466 meters

Calculate Y : tan 55° = Y/1000

y = tan55°*1000

y = 1428 meters

Calculate Z = 1428-466

z = 962 meters

The plane traveled 962 meters in 20s.

Posted in Group7.

Linear Functions

Hello this is the exercice of math about linears functions

1)Witch is the function G(x)



  1. find with the calculus if C[-3;-5] is in g(x)

  2. Dress the variation's table of f(x) and g(x)

4)If x=2 find f(x) with f(x)=x3-2x²+4

5)is h a linear function  h(2)=4 and h(3)=6 Find the expression of h:

Posted in Group2.


You are a chairman of a gas and water company. 1) For your products, you have to find lewis' representation of the water and te butanol (it's a gas) ? 2) You have 1kg of water and 2kg of butanol. How mol of water and buanol have you got 3) You have find he bilan equation of a concurent company but the equation in not complete. Complete this equation : C3H8+.......O2->.........CO2+......H2O

Posted in Group8.

Chemistry exercise

A man had stolen the recipe of a magic potion. He can read : In a flask of 250 ml, put 6*10-2 mol of sodium hydroxide. Then add 7 mol of water and 1,6*10-2 mol of glucose powder and finally three drops of methylene blue. Obstruct the flask and shake the solution. Transform the recipe with adapts units

Posted in Group7.

Math exercise 2

ABCD is a rectangle trapeze with AB=6; CD=2 and AD=4. M is a point on [AD] and AM=x. AMNP is a rectangleas N is a point on [BC] and H is the orthogonal projection of C on (AB). 1) Give the interval that belong to x. 2) Prove that the triangle CHB is isocele rectangle in H. Prove that PB = x.

Posted in Group7.

An exercise of geometry

Welcome in France !

Make an isoscele triangle ABC in A.

AB = 8 cm and BC = 6 cm --> The base is down.

Find the midpoint N of the base.

Make a semi-circle whose the centre is N. The radius of the semi-circle is 2 cm.

Be careful : the semi-circle is inside of the isoscele triangle.

The two intersections of the semi-circle with the base are called O and P.

Draw the mediator of ABC.

Draw a perpendeicular line (d) to [AN]. The length between A and this line is 4,5 cm.

Draw an another perpendicular (f) line to [AN] but this time, the length between A and this line is 3 cm.

The intersections of (f) and [AB] and [AC] are called R and S.

The intersections of (d) and [AB] and [AC] are called T and U.

The intersection of (f) and [AN] is called K.

The intersection of (d) and [AN] is called J.

Make a circle C whose the centre is J with a radius of 1,3 cm

Make a circle C' whose the centre is K with a radius of 1 cm

The intersections of C and (d) are called W and X

The intersections of C' and (f) are called Z and Y.

Draw the lines segments [YW] and [ZX]. You must have the trapezium WXYZ.

Erase the line segment [OP].

Erase the line segment [TW].

Erase the line segment [XU].

Erase the line segment [RZ].

Erase the line segment [SY].

Erase the circles C and C'.

Now you must guess which famous and French monument is it ?

Posted in Group9.

Math exercise 2

Hello ! It's the second exercise of maths :

Thibault breed Merin, a young fighter dragon. He want him to have an armour and gave all of his measures to the armourer. But, some of them was erased.

Here is what stay :

Total length : 15m

Length of the head : 3m

Length of a leg : 1,5m

Waistline : 6,28m

Surface of the body : 31,4m²

Surface of the tail : 23,4m²

Breadth of the body :

Length of the body :

Surface of a rectangle : 1,5m²

Breadth of a rectangle of wing :

Length of a wing :

Breadth of a wing :

Surface of a wing :

Wingspan :

Each wing is composed by 3 equals rectangles. The body and the tail are cylinders.


Posted in Group3.