3.1 x 10^10
Yeah, that's it.
() is for < and >
[] is for ≤ and ≥
(a,b) means from a to b, not including a or b
(a,b] means from a to b, not including a, but including b
so
x<-3
so from -3 to less of that or
from -∞ to -3
you can't equal -∞, so we use parnthasees
also, it is < so we use parnthaees
(-∞,-3)
You do --12/15---you see that this can be simplified by the same factor 3-- si you divide by 3 on both numbers thus you get---4/5 as the answer
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