1.

Write the set in roster form: {x : x = 7a, a∈N and 3

Answer»

Answer:

{28, 35, 42, 49}

Step-by-step explanation:

We have,

A = {x : x = 7A, a ∈ N and 3 < a ≤ 7}

So,

a = {4, 5, 6, 7}

Then,

A = {(7 × 4), (7 × 5), (7 × 6), (7 × 7)}

A = {28, 35, 42, 49}

Hence,

In Roster form, we get,

{28, 35, 42, 49}

HOPE it HELPED and believing you understood it....All the best



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