At x=-4,, that is where y=0 and y has to be positive
that is where the slope of graph changes, because that is the vertex
so basically we flip the graph at x=-4
it is positive for x>-4
fliped for x<-4
so basically graph
y=x+4 in x<-4
y=-x-4 in x<-4
Quick question, why didn't you just use the calculator on the device you took this photo with? Anyway, the answer is 5.62
Equilateral and Acute, not 100% on the acute though
Answer: Because 
, therefore 
.
By definition of conditional probability,
The inclusion-exclusion principle tells us
Then
