I need help, can somebody plz help

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

Identify the number 127 as a rational or irrational. explain

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?