13. Find an equation of the circle with its center at the origin and tangent to the line 4a3y+19 = I}. 14. Find an equation of the line tangent to the circle :1:2 +3;2 Ea: Zy 15 = [I at the point (El, 5}. 15. A single-lane street 1!] ft wide goes through a semicircular tunnel with radius El ft. How high is the tunnel at the edge of each lane? Round off to 2 decimal places