If you wanted to find the mean shoe size of students in an elementary school which group would provide the most accurate sample?
O A. All the third-grade boys
B. An entire class of kindergarteners
O C. Two random students from each classroom in the school
D. All the fifth-grade girls

Three coins are flipped. what is the probability that there will be at least two tails?

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?