On which of the following intervals is {{MATH_345}} concave down? {{CMD_346}} {{CMD_347}}{{MATH_348}}{{CMD_349}} {{CMD_350}}{{MATH_351}}{{CMD_352}} {{CMD_353}}{{MATH_354}}{{CMD_355}} {{CMD_356}}{{MATH_357}}{{CMD_358}} {{CMD_359}}{{MATH_360}}{{CMD_361}} {{CMD_362}} {{CMD_363}} {{MATH_364}} is concave down when {{MATH_365}}. This occurs for {{MATH_366}} on this graph. So the correct answer is to select both {{MATH_367}} and {{MATH_368}}. {{CMD_369}} {{CMD_370}} {{CMD_371}}