There was 420 hamburger and cheeseburgers. the cheeseburgers sold two times then the hamburger. how many hamburgers were sold

What are potential hypotheses (explanations) regarding why there are ecological equivalents between many metatherians and eutherians? discuss your hypothesis in terms of the processes that could lead to the current ecologies and distributions of metatherians and eutherians.

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building

10x − 5y + 14 = 0 whats the answer pls