What is 147.5% as a decimal?

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?