1) Find a formula for a sub n for the arithmetic sequence a sub 1 = 7, d = 12. 2) Write the first 5 terms of the geometric sequence a sub 1 = 2, r = 2.

Step-by-step explanation:

nth term = a₁ + (n-1)d = 7 + (n-1)12

nth term = a₁rⁿ⁻¹ = 2×2ⁿ⁻¹ = 2ⁿ

a₁ = 2

a₂ = 4

a₃ = 8

a₄ = 16

a₅ = 32

[1] Formula for finding nth term,

a₁ + (n - 1)d = 7 + (n - 1)12

[2] Formula for finding nth term of g.p,

a₁rⁿ⁻¹ = 2×2ⁿ⁻¹ = 2ⁿ

Now, a₁ = 2; a₂ = 4; a₃ = 8; a₄ = 16; a₅ = 32.

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step-by-step explanation: