Claire is making a new cushion covers for a chair. There are three sizes of cushions of the chair. what is the surface area of the arm rest cushion?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Prove that quadrilateral is a rhombus.

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?