Question

2ˣ⁻¹$geq$15

Answer 1

2^(x - 1) ≥ 15
2^(x - 1) = 15
2^x * 1/2 = 15
2^x = 30
x = log2 (30)

x ≥  log2 (30)
x ∈ [  log2 (30); + ∞)