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work and correct = brainlist

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction

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?