Answer :

Answer: y = 5

Step-by-step explanation:

  1. [tex]x^{3} +15 = 140[/tex]
  2. Subtract both sides by 15
  3. [tex]x^{3} =125[/tex]
  4. Cube root both sides
  5. [tex]\sqrt[3]{y^3} =\sqrt[3]{125}[/tex]
  6. y = 5