Angle x is a third quadrant angle such that cos x = -1/5.

What is the exact value of cos (x/2)?

Enter your answer, in simplest radical form, in the box.

cos (x/2) = ___

The trigonometric ratios sine and secant are reciprocals of each other

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?