The answer would be 12 since there are 3 jars and 36 bracelets. You divide the 36 bracelets into the 3 jars which gives you 12 bracelets in each jar. Hope this helps!
Just use y2-y2/x2-x1
so
1+5 (because subtracting a negative is the same as adding a positive)
4-2
6/2
or 3/1 which is the same as 3
Its when x+-1 because thats when f of x or f(x) is highest