Show how to use mental
math to find 513 - 198

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

What is the value of x? enter your answer in the box.

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?