I don't know pls pls pls help me I don't understand‍♂️

What is the solution set of the quadratic inequality x2- 5< 0? o {xl-55x55{x- 155x55){xl -55x5 15){x1 - 15 sx5/5)

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex