How much waster must be addded to 1 gallon of pure antifreeze to get 60% or antifreeze?

Can someone tell me if this is perpendicular? !

Find the missing dimension! need asap! tiny square is a =3025 in ²

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?