Question

помогите пж............

Answer 1

x + 3x + 5= 17
4x= 17 -5
4x = 12
x = 3

Answer 2

10к-0,83=10*0,83-0,83=7,47
10к-0,83=10*8,3-0,83=82,17
10к-0,83=10*0,083-0,83=0

Answer 3

спс

Answer 4

пж)))