Answer:
In the step-by-step explanation!
Step-by-step explanation:
Not sure if it is too late but here:
1.)

2.)

3.)

Hopes this help! Please give me Brainliest!
Hello
x
x +5
x + 7
x + x + 5 + x + 7 = 21
3 x = 21 - 12
3 x = 9
x = 3
3 , 5 et 7 pouces
Answer:
34
Step-by-step explanation: