Question

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Answer 1

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Answer:

  21.  3x^2 +7x

  22.  6x^3 +3x

Step-by-step explanation:

21. The perimeter is the sum of the side lengths.

  P = (x^2 +3x +1) +(4x -1) +(2x^2)

  P = x^2(1 +2) +x(3 +4) +(1 -1) . . . . combine like terms

  P = 3x^2 +7x

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22. The area is the product of the dimensions.

  A = (3x)(2x^2 +1)

  A = 6x^3 +3x . . . . . use the distributive property