Please help with the steps!

4. 0 is the centre of this circle and point Q is a point of tangency. Determine the value of c. If necessary, give your answer to the nearest tenth. 5. Point O is the centre of the circle. Points P and Q are points of tangency. Determine the values of x and y. Justify your solutions. 6. Point O is the centre of the circle. Point P is a point of tangency. Determine the value of x to the nearest tenth. Justify your solution. 7. Point O is the centre of the circle. Point P is a point of tangency. Determine the values of a" and y. Justify your solutions. 268. A wheel has radius 30 cm. It rolls along the ground toward a tack that is 58 cm from the point where the wheel currently touches the ground. What is the distance, d, between the tack and the closest point on the circumference of the wheel? Give the answer to the nearest tenth of a centimetre. 9. A circular plate has radius 13 cm. It is packed in a square cardboard frame whose 4 edges just touch the plate. What is the distance, d, from the centre of the plate to a corner of the frame? Give the answer to the nearest tenth of a centimetre. 13 com 10. Draw and label a diagram to illustrate the relationship between a chord, its perpendicular bisector, and the centre of a circle. 11. 0 is the centre of the circle. Determine the value of x to the nearest tenth, if necessary