Find slope of line that contains (1,6) and (10,-9)

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2