Describe and correct the error in writing the product as a power

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

Reduce fractions expressing probability to lowest terms. in 3,000 repetitions of an experiment, a random event occurred in 500 cases. the expected probability of this event is?

Akitchen is 12 ft. by 14 ft. with 10 ft. high walls. how much would it cost to put vinyl flooring in this room? $8.80 per ft