What island was Pythagorean’s born on

What number line represents the solution set for the inequality -1/2 greater than or equal to 4

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! )

Why is it so easy to buy on impulse and overspend with a credit card? what could you do to counteract this tendency?