Answer:
The last expression is correct
Step-by-step explanation:
We have been given the following expression for simplification;

The bases of the two expressions are the same. They are both equal to 4. When multiplying numbers with the same base, we simply add their exponents. In this case our exponents are;
4 and -9
adding them we have;
4 + (-9) = -5
The simplified expression thus becomes;

Look at the attached picture
Hope it will help you
Good luck on your assignment
Have a great day...
lets say there are 100 girls.
4/5 of 100 is 80, so 80 girls have brown hair.
3/4 of the 80 who have brown hair have long hair.
3/4 of 80 is 60.
so we know that out of 100, 60 have long brown hair.
in simplest fraction form, 60/100= 3/5
1.2% of 8th grade students is the percentage change.
Most likely 10 because the initial amount is 5