Does anybody know the answer?

Which of the following would represent the sum of 3 consecutive integers if x is the first integer?

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

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.