Aparticular typist makes an average of four typing errors per page. if more than four errors appear on a given page, the typist must retype the whole page. what is the probability that a certain page does not have to be retyped?

Evaluate the following expression 1/3^2

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.

What is the length of the segment, endpoints of which are intersections of parabolas y=x^2− 11/4 x− 7/4 and y=− 7 /8 x^2+x+ 31/8 ?