Answer asa which of the following sets are closed under addition? select all that apply. a) integers b) irrational numbers c) whole numbers d) polynomials

  A, C, D

Step-by-step explanation:

The sum of two irrational numbers may be rational:

  √2 + (-√2) = 0

so that set is not closed under addition.

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For any of the other sets, addition of two members of the set always results in another (not necessarily different) member of the set.

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1

do your own work and don"t cheat.

step-by-step explanation: