How many minutes untl heart beats 300 times

Which expression is equivalent to 4 square root 6 divided by 3 root 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! )

Which choice has the correct steps in graphing the solution set to the following inequality? -45_> 20x-5y