PLease help on this :) both of them :))

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

Askateboard ramp is in the shape of a right triangle what is the height of the ramp

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