True or false? logic and formal proof are recent developments in mathematics.

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

Write an inequality and solve each problem.for exercises 11 and 12, interpret the solution.

Write the pair of fractions as a pair of fractions with a common denominator