Help with 14,15,16

If f(0) = acos(be) - 1, where a > 0 and b > 0, then a true statement is red Select one: d out of Oa. -a-150 0 and b 2 0, as shown below. She found three x - intercepts at yet 37 T and - - . The value of b rounded to the nearest hundredth is swered 12 ' 12 12 arked out of Flag estion