please help me with this :) *brainliest and 5 stars

Find the area of the regular hexagon if a side is 20 cm.

How can (square root of 25) ^2 be rewritten?

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! )