Can anyone me with this question? errr

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.

Acentral angle measuring 160 degrees intercepts an arc in a circle whose radius is 4. what is the length of the arc the circle formed by this central angle? round the length of the arc to the nearest hundredth of a unit. a) 4.19 units b) 6.28 units c) 12.57 units d) 12.57 square units

The graph shows a vertical translation of y= square root of x cubedwhat is the range of the translated function? {yly < 0}{yly > 0}{yly is a natural number}{yly is a real number}