Find the composite area of the shape

Which of the following is correct interpretation of the expression -4+13

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

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.