1) Dado os conjuntos A = {1, 4, 6, 9} e B = {1,6,7, 10}, a união de A com B (A ∪ B) é: a) A ∪ B = {1, 4, 6, 7, 9, 10}
b) A ∪ B = {1, 6, 9}
c) A ∪ B = {1, 6}
d) A ∪ B = {6, 9}
e) A ∪ B = {1}

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step-by-step explanation:

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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 -