Lake superior is the largest of the great lakes. it covers a surface area of about 30,000 square miles. how can you show the estimated area of lake superior as a whole number multiplied by a power of ten

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

In the diagram below, abc is congruent to dec what is the value of x

Cole says the distance between points (-5,0) and (0,-5)is 5 units. is he correct? explain why or why not.