Find the angle between the given vectors to the nearest tenth of a degree u= 8,7 v=9,7

Which of the following is correct interpretation of the expression -4+13

Using elimination, what is -4x+2y=-12 4x+8y=-24

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?