Mary has a toy which is in the shape of a right prism with triangular bases. the sides of its bases are each 4 feet and its approximate height is 3.5 feet. the length of the prism between the bases is 10 feet. what is the approximate surface area of this right prism?

1.We have to find equivalent expression of ⇒ 54 x+18

These are the equivalent expression of

=3×3×3×2× x+3×3×2

=3×3×2×(3 x+1)

=18×(3 x+1)

2.⇒Equivalent expression of→ 18×(3 x-1)

=18× 3 x -18[Using commutative property of Multiplication with respect to subtraction)

=54 x-18

3.⇒Equivalent expression of→6×9 x+ 6×1

                 =54 x +6

⇒Option B

6×9 x +6×3equivalent expression of →54 x+18

⇒Option C

54 x+6equivalent expression of →6×9 x+ 6×1

⇒Option D

3×(18 x+2)equivalent expression of →6×9 x+ 6×1

⇒Option F

9×6 x -9×2equivalent expression of → 18×(3 x-1)

(credit to: not me-)