Answer:
-19ab + 2ab^2 +7
Step-by-step explanation:
all you do is combine the like terms. and the omly like terms are -10ab and -9ab. 2ab^2 is not one of the like terms simply because of that ^2.
i would say C
6.39*10^-4
according to the form that is used to convert usual into scientific notation it be like 6.39*10^-4
Step 1- Down
Step 2- (8 -1)
4÷1/5=20
3÷1/10=30
3÷1/4=12
2÷1/12=24
4÷1/9=36
5÷1/6=30
4÷1/8=32
3÷1/3=9
