Iwould like to know if 4 dm is greater or less than 40 cm

If 1 is divided by the sum of y& 4.the result is equal to 3 divided by 4, find the value of m

Acircular garden with radius of 8 feet is surrounded by a circular path with a width of 3 feet. what is the approximate area of the path alone? use 3.14 for π

For what value of (y) is 3^3/3^y =1/9