Which equation correctly uses the value of x to represent the cosine of angle a?

Which of the following is the result of expanding

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

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom