K + 35 = 63 equals what

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

Find the missing dimension extra points

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?