{e} Give the intervals of concavity off {1). Note: Use the letter U for union. To enter one. type innity. If the function is never concave upward or concave downward, enter NA in the associated response area. concave upward: I ' n IE concave downward: I ' n IE {I} Give the inection points of f (3} Enter vour answers in increasing order of the z-coordinate. If there are less than two pointsr of inflection, enter NA in the remaining response areas. Include a multiplication sign between svmbols. For example, a. - :r. ins: cl ins _ ins: cl lea