Answer:
448
Step-by-step explanation:
A=((a+b)/2) h=(17+39)/2·16=448
1/2 or 0.5
x+75=180
x=180-75
x=105
x and a are on a straight line
a straight line=180
so you add the x to a=180
what? if u mean by rounding, its 103
78
