18x-(8x-7)=67 what does 'x' equal in this equation?

Which point lies on a circle with a radius of 5 units and center at p(6, 1)?

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.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16