Qplus 6 equals -10 , what does q equal ?

Math each whole number with a rational,exponential expression

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?

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)