ASAP please help me I don’t understand this and it’s due tonight

Nick estimated that 5/8+4/7 is about 2.explain how you know his estimate is not reasonable plz and fast i will give 50 points

Suppose you want just guess at the answers in a 5 question multiple-choice test. each question has 3 responses and only one is correct. what is the probability of getting two questions right just guessing? 20 points 0.3275 0.2753 0.7532 none of the above

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36