In the function y =.08x + 5, y represents the cost of water per gallons and x represents the number of gallons. how much does rhe cost of water increase foe every gallon

Given the following point on the unit circle, find the angle, to the nearest  tenth of a degree, of the terminal side through that point, 0≤θ< 360. p=([tex]\frac{ \sqrt{10} }{4} [/tex]