Here are a circle and a sector of the circle. They each have radius r. Circumference of circle=perimeter of sector. Work out the size of angle x. Give your answer in terms of pi.

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

Anormally distributed data set has a mean of 176.3 and a standard deviation of 4.2. what is the approximate z-score for the data value of 167.9? 2.00 −2.00 8.4 −8.4

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.