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 2y^6 +12y^4 +5y^3 +30y
Step-by-step explanation:
Given:
 rectangle height: 2y^3 +5
 and width: y^3+6y
Find:
 the area as a polynomial
Solution:
 The area is the product of height and width:
 A = (2y^3 +5)(y^3 +6y)
 A = (2y^3)(y^3 +6y) +5(y^3 +6y)
 A = 2y^6 +12y^4 +5y^3 +30y . . . . area of the rectangle