1) you have to use this formula: K=K0(1+r)^n (y=b*a^x)

r is persent, and n is the number of weeks.

K=17*(1,33)^7 = 125,144

there will be 125 worms after 7 weeks.

2) We now use the same formula:

999=17*(1.33)^x

x=log(999/17)/log(1,33)

x=14,28

it will take 15 weeks to make 999 worms

x²=(2x)²+(5/2x)²-2*2x*5)2x*cos ACB(angle)

…

x²=1x²/4*cos ACB

x²/(x²/4)= cos ACB

x²*4/x²= cos ACB

4x²/x²= cos ACB

4= cos ACB

So the cosinus of c is 4.

2)

The formule for find the aera of a triangle is (b*h)/2

so in this triangle is (5/2(AB)*cosC)*h/2 (but we are not sure)

2020-2004=16

Y=15.47*0.186*16

=201.98

In the year 2020, will there are 201.98 searches on “Santa Claus”

2) We change x by the number of years between 2004 and 1990.

1990-2004=-14

Y=15.47*0.186*-14

=-176

In the year 1990, there were 176 searches on “Santa Claus”

3) Can you give us more presision about this question. thanks

]]>And yes again |DE| is 12 ]]>

Okay, I just think that french is a very difficult language to learn. ]]>

QUESTION 1:

(BC) perpenducular to (AE) and (DE) perpendicular to (AE).

If to lines are perpendicular to a same line,so they

are parallels

So (BC) and (DE) are parallels.

A is on (BD) and (CE) and (BC) parallel to (DE)

so, with the theorem of Thalés we have :

BC/DE = AC/AE = (AB/AD)

4/DE = 7/21 we use the cross system

we have : 4*21=7DE

4*21/7=DE

DE=12

There are more people who speak french but it’s a very dificult language for French to ]]>