Plz im being time what is the reciprocal of 6 1/4 ?

4/25
1/64
−6 1/4
−42/5

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

Find the length of the diagonal of the rectangle. round your answer to the nearest tenth. || | | 8 m | | | | 11 m

Can some one me with these questions