Solve the trig equation for all values: cot 1/2x-1=0

Find the required measurements of the following trapezoids. a = 8 cm b = 16 cm h = 10 cm

Antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

W-16=-12 solve each one step equation plz