answer this question as soon as possible (discrete math question)
1. let = { ∈ ℤ| = + 4 for some integer }, = { ∈ ℤ| = −2 for some integer b}, and = { ∈ ℤ| = + 16 for some integer }.
prove or disprove the following:
(a) ⊆
(b) ⊆
(c) = a

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

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The monthly texting plan of all star cell is $11 per month and $0.25 per text. the monthly texting plan of top line cell is $14 per month and $0.15 per text. a student wants to set up a system of equations to find the number of texts for which the total monthly cost of the two companies is the same. he uses the variables x and y. he lets y represent the total monthly cost. what will x represent? x = number of texts x = cost of the total number of texts x = total monthly cost x = cost of each text