Unlike positives, with negatives, the larger a number is, the smaller it is.
Example :
4 > 2
-4 < -2
so -1.8 is GREATER then -2.1
here is a tip :
picture ur number line....plot -2.1....any number to the right is greater and any number to the left is less...and since -1.8 is to the right of -2.1, it is greater then -2.1
Answer:
a.) 
Step-by-step explanation:

Find two numbers that add up to -6 and multiply to -40 (you will most likely need a negative and a positive because -40):
-10 and 4
Factor:

Finito.
Answer:
It's -32x^2
Step-by-step explanation:
This problems needs an image!!