Which trig function to use for to solve for x?

Find the slope of the line passing through a pair of points

What is the value of x in the equation 1.5x+4-3=4.5(x-2)?

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?