R÷10+4=5 what does R euqe .

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

Rounded to the nearest tenth, what is the value of x

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?