Ricardo is 3 years older than courtney. in 5 years the sum of their ages will be 81. how old is ricardo now?

Which number produces a rationale number when multiplied by 1/5

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.

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?