The Heaviside function is defined by H ( x ) = { 1 , if x ≥ 0 ; 0 , if x < 0 . Using just the definition of integrable, prove that the Heaviside function is integrable on [ a , b ], where a < 0 < b. What is the integral?

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

The volume of a box varies directly with its length if a box in the group has a length of 30inches and k=24 what is its volume

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad