A 5 question quiz is taken in which the 1st and 2nd questions have 4 answer choices, the 3rd and 4th have 3 answer choices, and the last question has 5 answer choices. If a student marks an answer randomly for each question, what is the expected number of questions he will answer correctly?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.

How is this equation completed? i cannot find any examples in the book.