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Number of shoes produced in 10 years is approximately 2 × 10^6 pairs of shoes

Step-by-step explanation:

Number of shoes produced per month = 1.81 × 10^4 ≈ 2 × 10^4

Number of months in 10 years = 1.2 × 10² ≈ 1 × 10²

⇒ Number of shoes that will be produced in 10 years = (2 × 10^4)(1 × 10²)

          = 2 × 10^6 pairs of shoes in 10 years.

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 -