A rock is being launched into the air. 15 feet away from the launch site is a lamp. If the rock is travelling vertically upwards at 6 feet per second, what is the rate of change of the angle of elevation (θ) from the lamp to the rock when the rock is 45 feet off the ground? Submit an exact answer.

Sam makes his sales calls according to a pattern. he travels either north or south depending on the calendar. some of his past trips were as follows: on february 17, april 24, june 10, september 19, and november 3 he drove north. on february 28, may 25, august 22, november 20, and december 18, he drove south. describe sams' pattern. in which direction will sam drive on oct4 and oct 24?

Which expression is equivalent to the expression shown?

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?