If x> 0 and cos theta= 2/x , what is tan theta in terms of x

What is the rescursive formula for this geometric sequence? 7, -14, 28, -56

Twenty points. suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet

9/10 divide by -3/15 as a mixed number