Which temperature is colder? -10 -21 5 10

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

Find the area of the regular hexagon if a side is 20 cm.