Pls help me

(-7a2 9a3x3 :(-3ax3)] : ( 10a) -(-20a b) : (-5a²b)

(-21a^5×b)/(2+4b)

Step by step explanation:

The question isn't complete and clear as we were not told what to determine from the expression.

Looking at the question, we can tell we are to simplify the expression.

[(-7a² × 9a³x³) :(-3ax³)] : [( 10a) -(-20a b) : (-5a²b)]

First we would work with expressions in each parenthesis (bracket).

Then we would work on the answer we derive after opening the parenthesis.

See attachment for detail

anser is a

step-by-step explanation:

negitive slope