$437.96 is the answer u can use a equation like the one above
100+75+70+x= 360° (sum of interior angles of quadrilateral)
x= 360-245= 115°
Answer:b x (3a+c)
Step-by-step explanation:
Collect like terms
3ab + 3cb-2bc
3ab+cb
Factor out b from the expression
b x(3a+c)
and the area would be 
.