Fencing costs $25.80 per yard. How much does it cost to enclose two adjacent rectangular pastures as shown?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

Simplify the following expression 48^1/2