Answer:
-20c^2 d^3 - 16cd^2
Step-by-step explanation:
Answer:
Hello!!! Princess Sakura here ^^
Step-by-step explanation:
The 1st one is:

The 2nd one is:

Answer:
Step-by-step explanation:
He should not have simplified 3/7 to 1/7 as they do not equal - he now has 2 less sevenths than before.