The hamers plan to add a rectangular shaped pool to their backyard/ the pool will have a 4-foot deck around it, as shown in the diagram below.

See the attachment. I find it easier to split up the deck as such. We can now take areas of these 4 new rectangles that we made that we can find the dimensions for easily.

Left rectangle: 4*33 = 132 feet

Right rectangle: 4*33 = 132 feet

Top rectangle: 4*15 = 60 feet

Bottom rectangle: 4*15 = 60 feet

Add up all these areas to find the total area of the deck:

132 + 132 + 60 + 60 = 384 feet total.

This is answer C.

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m