EP-21 What is a requirement for fire extinguishers on a boat?
Must be filled with water
Must be red or orange in color
Must be Coast Guard approved
Must be permanently mounted

Must be Coast Guard approved

Step-by-step explanation:

--The use Coast Guard has a fire extinguisher requirement based on the boat size.

-The fire extinguisher on board has to be approved by the US Coast guard for protection of the engine compartment.

part a:

9x2 + 24x + 16 =

(3x + 4)^2

each side measures (3x + 4) units.

part b:

16x^2 - 25y^2 =

= (4x + 5y)(4x - 5y)

the dimensions of the rectangle are (4x + 5y) units and (4x - 5y) units.