Kristin is using paper for an art project that is 0.025 mm thick. If she glues a layer of the paper onto a construction board with a thickness of 7 x 10-2 mm, what will the total thickness of the paper and the construction board be?

$12. that is my answer.

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see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -