You have an envelope that is 9.5 inches by 4.2 inches and has a triangular flap with a height of 2.4 inches. what is the area of the envelope?

See attachment
area of recangle=legnth times width
area of triangle=1/2 times base times height

recangle:
legnth=9.5
width=4.2
area=9.5*4.2=39.9

triangle
base=9.5
height=2.4
aera=1/2 times 2.4 times 9.5=1.2 times 9.5=11.4

add them
39.9+11.4=51.3

area is 51.3 square inches

give other user brainliest, my mistake

Answer erosion,oil spills,pollution,tourism,urban development;

B. is the correct answer