What does r equal in this problem 0.3r = 2.1

Use the distributive law to multiply. 3(4x + 5y + 6)

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?