First divide the coefficients:-
-18 / -12 = 3/2
a^-2 / a^-4 = a^2
b^-5 / b^-6 = b
so the expression simplifies to 3a^2b / 2
Answer:
Step-by-step explanation:

Well that symbol is an indention or multiply sign of expression
2.8a^2=55
a^2=55/2.8
a= square root of 55/2.8
5x5 - 10x = 0
5x5 - 10x = 5x • (x4 - 2)