Answer:
80%
Step-by-step explanation:
Cause four divided by five equals .8 so then multiply it by ten and u get 80%
the third one: -15 <= 4x-3 < 5
its B
2×x=2x
(x+1)×(x-1)=x²-x+x-1=x²-1
I guess you're supposed to simplify?