1. evaluate: -5x^0 + (65)^2/3 + (1/16) ^-1/2 2. if f(x)=(x+13)^1/2 + (x-5)^0 +(x+5)^-2/3, find f(3).

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Given that sin∅ = 1/4, 0 < ∅ < π/2, what is the exact value of cos∅? a. (√4)/4 b. (√15)/4 c. (4π)/2 d. (4√2)/4