Help!! no can seem to help me :/

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle

The amount of data left on the cell phone six gb for 81.5 gb of data is used how much data is available at the beginning of the cycle

Percy rides his bike 11.2 miles in 1.4 hours at a constant rate. write an equation to represent the proportional relationship between the number of hours percy rides, x,and the distance in miles, y, that he travels.