What set of reflections would carry triangle abc onto itself?

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20

Aprobability experiment is conducted in which the sample space of the experiment is s={7,8,9,10,11,12,13,14,15,16,17,18}, event f={7,8,9,10,11,12}, and event g={11,12,13,14}. assume that each outcome is equally likely. list the outcomes in f or g. find p(f or g) by counting the number of outcomes in f or g. determine p(f or g) using the general addition rule.