Where do i put parentheses and brackets to make the equation 40-2*8+2-10 = 10?

Find the equation using the point (4,8)

When a 757 passenger jet begins its descent to the ronald reagan national airport in washington, d.c., it is 3900 feet from the ground. its angle of descent is 6 degrees. how far must the plane fly to reach the run way? a. 37,106 ft b. 37,310.4 ft c. 23,456.6 ft d 2,492.7 ft

What is the period of the sinusoidal function ?