Les parents de luc augmente chaque anné son argent de poche mensuel de 10% en 2018 il a commencé avec 10€ Quel sera son montant en 2028?

168

step-by-step explanation:

i am pretty sure that the answer is 168

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

m∠a is 90°

m∠b is 40°