P.E.M.D.A.S
First , you multiply.
200+(-16)4
200+(-64)
Since they have different signs, you subtract and keep the sign of the greater absolute value.
200+(-64)=136
Answer:
Step-by-step explanation:
1/2 * ( 9 * 6 * 10)
1/2 * 540
270 
7 would probably end up being 6 12/12 if I am doing his correctly.
Do the ones in pararenthes first then match them and U will get the answer