Is 20b+16c equal to 4(4b+5c)

Select the two pairs of figures that are similar.

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

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?