7+0.6+0.05+0.007 in standard form

In which form is the following function written? y = - 2(x – 3)(x + 5)

Which expression converts 45 degree to radians

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?