0. The length of a rectangle is 4r2s5t3 units, and the rectangle's area is 20r5sta square
units. If r#0, S70 and t#0, which of the following best describes the width of the rectangle?
TEKS 5.80)
a) 5r3sat units
b) 5r7g12t7 units
c) 16r3sat units
d) 2487$12t7 units

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?