Answer:
It decreased by 61.5%
Step-by-step explanation:
Answer:155
If a=3 and b=5 then
3•5/15+3•6+7•5=155
105.84 cm
A = 1/2 bh
A = 1/2 (16.8) 12.6
A = 1/2 (211.68)
A = 105.84 cm
hope it helps :)
mark brainliest!!
36 is the anwser