You need to ask the question while you say you have troubles, But what can I help you with?
Answer:
A=0.5(a+b)h
=0.5(27+17)4=88units^2
Step-by-step explanation:
Hi, this is the notation for inclusion of all real
numbers.

We can also state numbers which are positive or negative with a sign on top of the R notation like so:
ns +sb = 5.4 cm
sb = en so en can be plugged in for sb
therefor es = 5.4