Rodrigo utiliza um controle remoto composto somente das teclas 0, 1, 2, 3, 4, 5, 6, 7, 8 e 9 para poder trocar os canais da sua televisão. Qual é a probabilidade (em porcentagem) de Rodrigo, com os olhos fechados, apertar, em uma única tentativa, um número múltiplo de 4? *

5x+2x=49

7x=49

x=7. 35 apples

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.

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

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step-by-step explanation: