Respuesta :

Step-by-step explanation:

Use the area formula for rectangles in both questions.

[tex]area = l \times w[/tex]

16. 70 = 7(x + 4)

70 = 7x + 28

42 = 7x

x = 6

17. 55 = 5(3x - 1)

55 = 15x - 5

60 = 15x

x = 4