Question

пожалуйста помогите срочно

Answer 1

2)

3a = 15*4

3a = 60

a = 60 : 3

a = 20

4)

29b + 172 = 5³ * 3

29b + 172 = 125 * 3

29b + 172 = 375

29b = 375 - 172

29b = 203

b = 203 : 29

b = 7