Answer:
If he has completed 3/5, he still needs to complete (1-3/5) or 2/5ths
400 * 2/5 = 160
He needs 160 points
x+-x = 0
x-x = 0
0 = 0
infintely many solutions
not
Step-by-step explanation:
First is A and Second is B
Let's find A*B
b)
Now let's find B*A
c) They are not