I need help with this please-

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

Y+ 2/y is it a polynomial in one variable or not? and if so, why?

Which equation represents h for right triangle abc